By
An Assessmen and ad ise o snow
c ab in wes G eenland 2009
nDo e Bu meis e a Helle Siegs ad
By
AnnDo e Bu meis e
TEKNISK RAPPORT NR. 74, 2008
Snow c ab s ock s a us and ad iso y epo
2009
2
Ti el: Assessmen and ad ice o Snow C ab in Wes G eenland 2009
Fo a e (e): AnnDo e Bu meis e
Se ie i el og numme : Teknisk appo n . 74
Udgi e : Pinngo i ale i ik, G ønlands Na u ins i u
Udgi elses idspunk : No embe 2008
K ali e ssik ing: Ea l Dawe, Depa men o Fishe y and Science, New oundland,
Canada
O e sæ else:
Finansie ing:
Fo side o o: AnnDo e Bu meis e
ISBN: 87-91214-38-6
ISSN: 1397-3657
Bedes ci e e : Bu meis e , AD. 2008. Asessmen o snow c ab in Wes G eenland
20089 Teknisk Rappo n .74, Pinngo i ale i ik, G ønlands
Na u ins i u
Rek i e es: Rappo en e udelukkende udgi e elek onisk. PDF- il a
Rappo en indes på ins i u e s hjemmeside
h p://www.na u .gl/publika ione / ekniske appo e
De e mulig a ek i e e en udsk i a appo en he :
Pinngo i ale i ik, G ønlands Na u ins i u
Pos boks 570
3900 Nuuk
G ønland
Tl . +299 36 12 00
Fax. +299 36 12 12
in o@na u .gl
www.na u .gl
T68nisk appo n . 68, 2007
Pinngo i ale i ik, G ønlands Na u ins i u
Snow c ab s ock s a us and ad iso y epo
2009
3
Assessmen and ad ice o Snow C ab in Wes G eenland 2009
AnnDo e Bu meis e , Pinngo i ale i ik, G eenland Ins i u e o Na u al Resou ces. Box 570, 3900 Nuuk. G eenland. Phone: +299
361200. E-mail: anbu@na u .gl.
In oduc ion
This epo documen s he scien i ic basis o he assessmen o snow c ab (Chionoece es opilio) s ocks in
Wes G eenland. Snow c abs a e pa chily dis ibu ed and comme cially exploi ed along he coas and wi hin
he jo ds. The ishe y is managed by quo as and assessed when da a a e a ailable wi hin he insho e and
o sho e o 6 managemen a eas (Upe na ik, Uummannaq-Disko Bay, Sisimiu , Manii soq-Kangaamiu ,
Nuuk-Paamiu and Na saq-Qaqo oq. The epo b ie ly upda es and summa izes he his o ical backg ound
o comme cial c ab ishing, which includes ca ch, e o , CPUE and spa ial dis ibu ion o he ishe y, as well
as he esul s om scien i ic su eys unde aken by he G eenland Ins i u e o Na u al Resou ces (GINR).
Summa y
The e a e no speci ic long- e m managemen objec i es o he snow c ab esou ce in Wes
G eenland, howe e since 2004 he main objec i e o ecommenda ions om GINR has been o s op
he decline in biomass o he c ab esou ce in he di e en managemen a eas.
The ecommended ca ch le el o 2009 in Disko Bay insho e is 600 ons and iden ical wi h he
o al comme cial ca ch in 2007. The quo a should be di ided on 200 ons in he sou he n pa o
Disko Bay, 200 ons in he No he n pa o he bay and 200 ons in Vaiga . The TAC is educed wi h
60% compa ed o 2008.
Da a ob ained by logbooks and landings indica es ha he quo a has ne e been ully aken. The
ca ch has ne e been egula ed, bu he ishe y has been sel egula ing. Despi e a big dec ease in
emo als by he ishe y, bo h comme cial and su ey CPUE has only inc ease a li le and e y
g adually. Da a om esea ch su ey in he No he n pa o Disko Bay sugges some p og ession in
he o hcoming ec ui men o he esou ce, bu will no be a ailable o he ishe y be o e 2010. An
inc ease in ca ch in 2009, abo e 600 ons, could impose high handling mo ali y on so /shelled
c abs ha would ha m he o hcoming ec ui men .
The ecommended ca ch le el o 2009 in Sisimiu insho e is 500 ons, di ided on 300 ons in
he adi ionally ishing a ea and 200 ons in Nd . Iso oq and Nd . S oem jo d.
Da a om esea ch su ey in Sisimiu insho e sugges p og ession in he CPUE index and
o hcoming ec ui men o he esou ce. Also ishe y da a ob ained by logbooks showing p og ession
in he comme cial biomass.
The ecommended ca ch le el o 2009 in Sisimiu o sho e is 300 ons. Howe e cau ion mus be
aken while o hcoming ec ui men s ill a e a a low le el. Ha es ing should be moni o ed using a
p ecau iona y app oached, elayed on app oach o changes in ca ch le els, ca e ul moni o ing o
he popula ions esponse o he ishe y and implemen a ion o e-open / e-closu e c i e ia
Snow c ab s ock s a us and ad iso y epo
2009
4
Da a om esea ch su ey as well as da a ob ain om logbooks o Sisimiu o sho e sugges ha
he esou ce has shown signs o eco e y o he pas 3 yea s, excep o ec ui men which is on a
low le el.
The ecommended ca ch le el o 2009 in Nuuk – Paamiu insho e is 700 ons, and unchanged
om 2008.
The ecommended ca ch le el o 2009 in Nuuk - Paamiu o sho e is 1,600 ons, and
unchanged om 2008.
Due o he lack o su ey and ishe y da a no ecommenda ion is gi en o Manii soq-
Kangaamiu insho e and o sho e.
GINR ecommends a seasonal ishe y om Ap il o July in all managemen a eas o educe
disca ding and associa ed mo ali y o so -shelled c abs and o maximize ec ui men o he s ock.
Such a seasonal ishe y will also p omo e he mos op imal and sus ainable u iliza ion o he c ab
esou ce.
Resou ce s a us in each managemen a ea de i ed om ishe y da a
An o e iew o GINR‟s ecommenda ions and he imposed quo a and ishing s a us (open o closed) o he
managemen a eas in 2009 a e gi en in Table 1.
Table 1. Summa y o ca ch ecommenda ions o he c ab ishe y in 2009 om he G eenland Ins i u e o Na u al
Resou ces and o al ca ch om 2007 (ca ch s a is ics o 2008 a e incomple e a his ime).
Recommended ca ch
Insho e 2009 in ons
Recommended ca ch
O sho e 2009 in ons
Ca ch in ons 2007
Insho e
Ca ch in ons 2007
O sho e
Disko Bug 600 130 574 123
Sisimiu 500 300 559 225
Manii soq No ad ice No ad ice 13 174
Nuuk-Paamiu 700 1,600 111 410
Recommended ca ch in all 1,800 2,030 1,257 932
Snow c ab s ock s a us and ad iso y epo
2009
5
Species biology
Snow c ab habi a include si es we e bo om is
co e ed by mud/sand and ock. Thei die s inclu-
de b i le s a s, sh imp, younge s ages o snow
c ab (cannibalism), clams, polychae e wo ms and
o he c us aceans. P eda o s a e a ious g ound-
ish, snow c ab and human.
Snow c ab ha ching hei b oods in sp ing and
la ae unde go wo plank onic la al s ages and
se le o bo om du ing all. Ben hic ju eniles snow
c ab males as well as emales mol equen ly and
become sexually ma u e om > 50 mm ca apace
wid h (CW) depending on bo om empe a u e.
Snow c abs end o mol du ing sp ing and
con inue un il e minal mol a adul hood is
eached wi hin a size ange o 50 – 130 mm CW
o males and 40 – 95 mm CW o emales. A he
e minal mol males de eloping enla ges claws
imp o ing hei ma ing abili y. Only a po ions o
any gi en coho ec ui o he ishe y a 100 mm
CW, whe e he males is app ox. 8 o 9 yea s.
A e he mol o adul hood legal sized males
emain so /new shelled ha ing low mea yield o
he es o he yea . In he ollowing yea , mea
yield would ha e inc eased o a sui able le el o
he indus y. Disca d o so shell and new-shelled,
due o hei low yield con en s is esou ces was-
age.
His o ical ishe y backg ound
Snow c abs a e dis ibu ed along he Wes coas
o G eenland and a e comme cially exploi ed
p ima ily om Disko Bay in he No h (up o 71
30N) o Paamiu in he Sou h (60 45N). The
comme cial c ab ishe y is based on ca ches o
males ha each a minimum legal-size ≥ 100 mm
ca apace wid h (CW). Comme cial ishe y o
snow c ab began p ima ily in insho e a eas (wi hin
basis-line) in he mid-1990s and om 1999, also
included o sho e a eas (ou side basis-line).
Since 2004, he c ab esou ce in G eenland has
been managed in 6 a eas ( om No h o Sou h -
Upe na ik, Uummannaq-Disko Bay, Sisimiu ,
Manii soq-Kangaamiu , Nuuk-Paamiu and
Na saq-Qaqo oq, see Fig. 1). The ishing lee is
made up o wo componen s; small essels (less
han 75 GRT), which ha e exclusi e igh s o
ishing insho e wi hin he basis-line as well as
o sho e. Small essels a e, howe e , es ic ed o
ishing in only 1 managemen a ea du ing he
yea . La ge essels (g ea e han 75 GRT) may
only ish in all o sho e a eas (ou side he basis-
line), bu no wi hin he “C ab Boxes”. To al
allowable ca ch (TAC) es ic ions ha e been
imposed since 1995, bu ha e only limi ed he
ca ch in some a eas since 2004. The ishe y is
egula ed by p ohibi ions o land emales and
unde sized males (<100 mm CW), logbooks o all
essels la ge han 10 me e s and closu e o he
ishe y no h o 64°N o 3 mon hs (1 Janua y o
31 Ma ch). The e is also a egula ion ha s a es
mo emen o he ishing e o when so -shelled
c abs exceed 20% o he ca ch, howe e he e m
“mo emen ” is no speci ic and his is no
moni o ed. F om 2005 o 2007, he o sho e c ab
ishe y was closed in he managemen a eas
Manii soq-Kangaamiu and om 2005 o Augus
2007 in he o sho e a ea o Sisimiu excep o
dispensa ion o 1 essel ha was allowed o ish
in 2005. In 2006, he ishe y was closed o 2½
mon hs (July 1 o Sep embe 15) in all a eas
excep Uumannaq-Disko Bay (closed only 1
mon h om July 1 – Augus 3) o p o ec so -
shelled c abs.
The numbe o essels wi h licenses o pa icipa e
in he snow c ab ishe y inc eased by mo e han a
ac o o 3 om app ox. 120 o 374 boa s om
1999-2002. Since hen he numbe o bo h la ge
and small essels ha e dec eased subs an ially
as he abundance o he esou ce has also
declined. In 2008 he numbe license holde s
amoun ed 74 in all managemen a eas an 80%
educ ion compa ed o 2002.
Snow c ab s ock s a us and ad iso y epo
2009
6
The G eenland Ins i u e o Na u al Resou ces
(GINR) gi es s ock assessmen and managemen
ad ice o he s ock bo h insho e and o sho e
wi hin each managemen a ea when su icien
da a is a ailable. The decision o gi e ad ice o
bo h insho e and o sho e a eas was based on he
assump ion ha snow c ab mig a ion is limi ed
( agging s udies ha e indica ed app ox. 10 km pe
yea ) and he e o e he esou ce in di e en a eas
is conside ed o be spa ially independen .
Comme cial ishe y da a
Logbooks om he la ge essels >75 GRT ha e
been manda o y since 1999 in conjunc ion wi h
he s a o o sho e ishing wi h essels o his
size. Logbooks o he small essels (<75 GRT)
we e i s manda o y om July 2002, and hus i s
co e ed he annual ishe y in 2003. Only landing
s a is ics a e a ailable om boa s less han 10
me e s as hey a e no equi ed o epo ca ches
in logbooks.
Ca ch, E o and CPUE
The his o ical de elopmen o he c ab ishe y in
G eenland is shown in Figu e 2. The o e all
annual ca ches a e based on landings, because
ca ch s a is ics om logbooks o bo h small and
la ge essels ha e only been a ailable since 2003
and a e no always comple e. Landings inc eased
om app ox. 1,000 ons (no TAC) in 1995 o a
peak o app ox. 15,000 ons (TAC 26,800 ons) in
2001 (based on landings om small essels and
ca ch om logbook da a om la ge essels >75
GRT). F om 2001 o 2007 he o al ca ch has
dec eased by app ox. 89% o 2,189 ons (TAC
4,380 ons) despi e he quo a was no being
eached (Fig. 2).
The dis ibu ion o he landings in each
managemen a ea in Fig. 3 and Fig. 4, show ha
adi ionally, mos o he landings ha e p edo-
mina ely come om he a eas Disko Bay-Uum-
mannaq, Sisimiu and Nuuk-Paamiu . Comme cial
CPUE is de i ed om ca ch and e o da a om
logbooks.
The o al ishing e o ( ap hauls) has declined by
81% since 2001 ( om 3,416 o 665 housand ap
hauls du ing 2001-2007) (Fig. 3). The decline has
been mos ly due o a declining numbe o
pa icipan s in he ishe y. P elimina y and incom-
ple e logbook da a o 2008 shows o al e o is
240 housand ap hauls. The a io o o al lan-
dings o logbooks landing a ies be ween mana-
gemen a eas. The o e all dis ibu ion o he
ishe y along he Wes coas o G eenland om
2003-2007, de i ed om a ailable logbook da a is
shown in Figu e 4.
Resea ch Su eys
Since 1997, ap su eys ha e been conduc ed
annually in insho e a eas o Disko Bay and Sisi-
miu . In 2000, a Sisimiu o sho e a ea (Hols eins-
bo g Dyb) was included in he Sisimiu ap
su ey. In 2002, annual o sho e ap su eys
we e ini ia ed in a eas be ween Nuuk and Paamiu
and in 2003 we e ex ended no h o include he
o sho e in he Manii soq-Kangaamiu manage-
men a ea.
Me hods
Snow c abs a e sampled wi h Japanese-s yle
conical aps wi h la ge (70 mm) and small (21
mm) mesh sizes. Sampling s a ions a e a p ede-
e mined ixed posi ions o all yea s and soak
imes ange be ween 14-24 h s depending on
wea he condi ions. Bo om empe a u es a e e-
co ded a each s a ion.
Fo males, he ca apace wid h (CW) and chela
heigh (CH) a e measu ed (± 0.01 mm) o de e -
mine size and mol s a us (adolescen o adul ).
Male snow c abs s op g owing a e hei e minal
moul . Sexually ma u e males a e e e ed o as
an adolescen s ( ecognized by hei small claws)
p io o he e minal mol and as adul s a e hei
e minal mol (la ge claws). Males each legal size
( 100 mm CW) a abou 9 yea s o age. The
ange o ca apace wid hs de ining he adolescen
male g oups which a e p esumably 1, 2 and 3
Snow c ab s ock s a us and ad iso y epo
2009
7
yea s om ec ui men o legal size a e: ADO-1,
82.2-100mm CW; ADO-2, 67.3-82.2mm CW and
ADO-3, 53.2-67.3mm CW.
Fo emales, he CW and abdomen wid h (AW)
a e measu ed (± 0.01mm) o de e mine size and
ma u i y. Females ha ha e ma ed once and a e
ca ying hei i s clu ch o eggs a e called
p imipa ous, while emales ha a e ca ying hei
second clu ch and ha e ma ed mo e han once
a e called mul ipa ous. They a e dis inguishable
by he numbe o sca s on hei legs caused by
ma ing and by shell condi ions. Shell condi ion in
bo h males and emales is de e mined on a scale
o 1-5 acco ding o guidelines by Sain e-Ma ie
(1993).
Da a om ap su ey ca ches o males a e used
o de e mine CPUE (kg/ ap), mean CW o legal-
size males, shell condi ion and NPUE (numbe -
/ ap) o adolescen males o assess ec ui men
p ospec s. Male and emales size dis ibu ions a e
also desc ibed o ollow he p og ession o size
modes h ough he popula ions and de e mine p i-
mipa ous/mul ipa ous a ios wi hin he emale po-
pula ion.
Insho e su eys in Disko Bay and Sisimiu
In Disko Bay, 43 s a ions a e sampled annually
(Fig. 5a) and in Sisimiu , 40 s a ions a e sampled
(Fig. 5b), om May o June. The sampling gea
consis s o a longline o 10 la ge-mesh (70mm)
and 2 small-mesh (21mm) conical aps ished a
dep hs anging om 100-600m. T aps a e placed
app ox. 40m apa and bai ed wi h squid.
O sho e su eys in Sisimiu , Manii soq and Nuuk-
Paamiu
Fi een s a ions a e sampled annually in Sisimiu
o sho e (Fig. 5b) in June and a o al o 30-60 s a-
ions a e sampled in he Nuuk-Paamiu and Ma-
nii soq o sho e a eas in Augus -Sep embe (Fig.
5c). The sampling me hod in Sisimiu o sho e is
he same as he me hod used insho e in Disko
Bay and Sisimiu . In 2002, he sampling in he
Nuuk-Paamiu o sho e su ey was also he same
as he me hod insho e. In 2003, howe e , he
o sho e sampling me hod used in Nuuk-Paamiu
and Manii soq was changed such ha each
s a ion was hen sampled using a longline o 16
aps, eigh la ge-meshed (70 mm) aps al e na-
ing wi h eigh small-meshed (21mm) aps a
app ox. 40 m in e als and bai ed wi h squid.
Inpu da a om comme cial ishe y o assessmen
No sampling om he comme cial ishe y has
been conduc ed since he ishe y began in 1996.
A ailable logbook and landing s a is ics is used in
da a analysis om he comme cial ishe y. Log-
books nominal ca ches has since 2003 co e ed
mo e han 85% o he o al landings in G eenland.
Be o e 2003 less han 20% o he ishing lee
we e using logbooks.
In o de o calcula e a s anda dised CPUE index,
a GLM analysis (mul iaddi i e model) was ca ied
ou using haul by haul logbook in o ma ion
including ze o ca ches. The model includes yea ,
mon h and essel e ec s.
Snow c ab s ock s a us and ad iso y epo
2009
8
Managemen a ea: Uummannaq-Disko Bay
The his o ical ca ch, CPUE and e o da a o he
ishe y in Uummannaq-Disko Bay in he insho e
and o sho e a eas a e summa ized in Table 2.
Da a o 2008 a e p elimina y.
One o he mos impo an ishing a eas has been
Disko Bay whe e ca ches a e p edomina ely om
he insho e. To al ca ches peaked a 4,202 ons
(94% insho e) in 2001 and since hen ha e s eadi-
ly declined o 697 ons (82% insho e) in 2007, ap-
p oxima ely 15% o he 2001 ca ch.
Insho e - Disko Bay
Fishe y
The dis ibu ion o he ishe y in Disko Bay om
2003 o 2008, acco ding o a ailable logbook da a
is shown in Figu e 6. Fishing g ounds include bo h
Vaiga , a ea “Disko No d” and “Disko Syd”. The
geog aphic dis ibu ion o he ishe y has been
homogeneous in he pe iod om 2003 o 2007,
we e only used e o has changed ma kedly. In
2008 p elimina y da a indica e no o only a e y
limi ishe y in he a ea “Disko Syd”.
The ishe y in Disko Bay ypically s a s in Ap il,
peaks du ing he summe mon hs (June-July) and
s eadily declines owa ds he end o he yea ,
excep in 2003 when he ishe y peaked in Ma ch
and May. In 2006 he ishe y peaked in
Sep embe , mainly due o a closu e du ing July
and Augus . Mon hly ends in he ishe y CPUE in
2006 s able om Sep embe o Decembe a
app ox. 5 kg / ap, whe eas he CPUE s aidly
dec eased a he end o he yea in he p e ious
yea s (Fig. 7). 2007 we e almos ollowing he
end as in 2006, excep o a decline o 50% in
CPUE om Oc obe o Decembe . Ea ly season
ca ch a es (Ma -May gene ally dec eased o e
ome (2004-2007), pe haps because ea ly season
ocused on adi ional a eas. La e season CPUE
inc eased om 2004-2006, e lec ing alloca ion o
e o o new a eas as he season p og essed.
A s anda dised CPUE index (Fig. 8), show a
signi ican d opped in CPUE om 2000 o 2001
om app ox. 7 kg/ ap o 3.1 kg/ ap (F= 85.53,
P < 0.000). In he ollowing yea s CPUE has e-
mained low a a s able le el. P elimina y da a o
2008, ep esen ing app ox. 14% o he allowable
quo a, indica e inc easing ends in CPUE (Table
2) and (Fig. 8).
F om 2000-2001 ca ches insho e inc eased om
2,940-3,950 ons as e o mo e han doubled
(613-1274 housand ap hauls, Table 2). Ca ches
and e o ha e s eadily dec eased since 2001 by
app ox. 74% o 574 ons and 138 housand ap
hauls, espec i ely, in 2007 (Table 2 and Fig. 8).
S anda dised soak ime index (Fig. 9), shows a
signi ican ly dec ease in soak ime om 2001 o
2002. Since 2003 soak ime inc eased s eadily
un il 2007, a a le el o a e age 72 hou pe hauls
and compa able o 2001 le el.
Resea ch Su eys
Insho e (Sou h and No h)
In 2008 su ey was only conduc ed in he
No he n pa o Disko Bay.
T ap su eys ha e been conduc ed in 2 insho e
a eas o Disko Bay since 1997 (See Fig. 5a o
maps), despi e in 2008 whe e only he suba ea
No h, we e in es iga ed. CPUE o legal-size
males ( 100mm CW) in Sou h and No h peaked
in 2001 and 2000 espec i ely and ha e declined
s eadily by mo e han 50% o 2004; om 4.2-1.7
kg/ ap in Sou h and 7.5-2.3 kg/ ap in No h (Fig.
10). The 2004 CPUE was he lowes obse ed in
he ime se ies. In 2005 and 2006 CPUE in Sou h
was s ill conside ably below he e e ence mean
o 3.7, bu inc eased o 4 kg/ ap, ma ginally
abo e he e e ence mean, in 2007. In No h,
CPUE inc eased om 2.3 o 6.4 kg/ ap and has
eached he e e ence mean in 2006. In 2007
CPUE dec eased o 4.4 kg/ ap and only a e y
small inc ease o 5.1 kg/ ap was obse ed in
Snow c ab s ock s a us and ad iso y epo
2009
9
2008. Re e ence means a e based on he
a e age kg/ ap om 1999-2002.
The mean ca apace wid h (CW) o legal-size
males had con inually declined in bo h su ey
a eas o a minimum in 2004 (Fig. 11). CW subse-
quen ly inc eased in bo h a eas in 2005 and
emaining unchanged in Sou h o 2007, while he
mean CW has inc eased o e he pas 4 yea s in
No h o 116 mm CW in 2008 simila o
obse a ion om 2007.
The abundance o adolescen males (ADO-1),
measu ed as numbe pe ap (NPUE), peaked a
2.2/ ap in Sou h in 2001, and 2.6/ ap in No h in
2002 (Fig. 12). The NPUE o ADO-1 has since
declined sha ply in bo h a eas and was a he
lowes le els obse ed o he ime se ies in 2004
in Sou h. In 2006, he NPUE o ADO-1 males in
Sou h we e 0.8/ ap and inc eased in 2007 o
1.8/ ap, abo e he e e ence mean. NPUE o
ADO-1 in No h dec eased con inuously o 1/ ap,
he lowes le els obse ed in he ime se ies, om
2001 o 2007, wi h excep ion om a inc ease in
2005.The NPUE o ADO-1 in No h inc eased o
2.1/ ap in 2008 and is now abo e he e e ence
means and close o he highes obse a ion in he
ime se ies.
Annual ends in size dis ibu ion o adolescen
and adul males a e shown in Fig. 13. In Sou h
he e was no u he p og ession h ough he size
ange un il 2006. Da a om 2007 implies a ecen
inc ease in ec ui men caused by inc easing
ec ui men o small legal-sized new-shelled since
2005. In No h he ec ui men pulse in 2005,
esul ed in inc easing CPUE and mean CW as
legal-sided adolescen p e- ec ui s mol ed and he
„ ec ui men pulse‟ p og essed h ough he size
ange. The dec ease in ADO-1 males in 2006
showed up clea ly as a educ ion o adul males in
he size ange om 100mm o 130mm CW. In
No h he e was p og ession h ough he size
ange in 2007 and 2008. Da a om 2008 s ongly
implies a ecen inc ease in ec ui men caused by
inc easing ec ui men o small legal-sized new-
shelled since 2006. Fu he mo e in 2008, he
highes p opo ion o adolescen males om 60
mm o app ox. 80 mm CW has been obse ed in
No h (i.e. a mix o ADO2 and ADO3, expec ed o
ec ui o he ishe y wi h in 2 and 3 yea s om
2008). In No h he ec ui men pulse since 2008,
didn‟ esul s in inc easing CPUE in he wo
ollowing yea s.
Inc easing p opo ion o legal-size so and new-
shelled males (shell condi ion 1 and 2) ha e been
obse ed om 2001-2006 (Fig. 14) and ha e
peaked a a ound 70% in 2006 in bo h Sou h and
No h. The con inuously high p opo ion o so
and new-shelled males sugges s a con inuous
emo al o he olde shelled males by he ishe y,
which was becoming inc easingly dependen upon
ec ui men in he yea s om 2001 o 2006.
Howe e , he p opo ion o so and new shelled
males (shell condi ion 1 and 2) has dec eased o
less han 40% in 2008, sugges ing ha he ishe y
he pas yea has been less dependen o he
ec ui men o he s ock in he No h.
The a io o p imipa ous and mul ipa ous emales,
used o suppo ends in ec ui men , dec eased
sha ply in Sou h om 2000 o 2003, emained low
in 2004 and has inc eased un il 2006 and
dec eased again om 2006 o 2007 (Fig. 15). The
inc ease in Sou h in 2005 and 2006 could ei he
e lec he loss o a la ge g oup o ma u e emales
om he popula ion o ha a ec ui men wa e
could be o hcoming. In 2007 a mino dec ease
has been obse ed bu is a he 2005 le el. In
No h he a io o p imipa ous and mul ipa ous
emale has emained cons an a a le el o 0.45
om 2004 o 2006, dec eased o 0.26 in 2007. In
2008 he a io o p imipa ous and mul ipa ous
emales inc eased o app ox. 0.5, indica ing a
ec ui men o ma u e emales o he s ock.
Snow c ab s ock s a us and ad iso y epo
2009
16
Ou look - Insho e Manii soq-Kangaamiu
The e a e indica ions ha CPUE has sligh ly
inc eased o e he las yea , bu a dec ease om
2006 o 2007. Imp o emen is, howe e , small
conside ing he low comme cial ca ch and e o . I
is di icul o de e mine he biomass o he
esou ce in he a ea as a whole as logbook da a
om he ishe y a e limi ed o a small insho e a ea
in he no he n pa o Manii soq-Kangaamiu .
The e is no su ey in he insho e a ea so compa-
a i e biomass and ec ui men p ospec s a e
unknown.
Recommenda ions o he 2009 ishe y -
Insho e Manii soq-Kangaamiu
Due o he lack o su ey and ishe y da a no
ad ice is gi en o Manii soq-Kangaamiu insho e.
O sho e Manii soq-Kangaamiu
Fishe y
Ca ches in Manii soq-Kangaamiu o sho e
inc eased om 381 o 826 and 743 ons om
2000 o 2001 and 2002, espec i ely as e o
inc eased om 50 o 275 housand ap hauls.
CPUE du ing he same pe iod was o iginally 7.6
kg/ ap in 2000 bu dec eased subs an ially o 2.7
kg/ ap in 2002 sugges ing he esou ce biomass
was nega i ely a ec ed by he inc ease in he
ishe y. In 2003 he ca ches declined by 41% (445
ons) as e o dec eased by 44%. Despi e hese
educ ions he CPUE emained low a 2.8 kg/ ap.
In 2004 CPUE dec eased u he o 2.1 kg/ ap
despi e a u he 76% d op in ca ches indica ing
he esou ce was s ill in a s a e o decline.
The con inued poo s a e o he esou ce biomass
and con i ming da a om a biological su ey led o
he ecommended and implemen ed closu e o he
o sho e a ea in 2005 and again in 2006 o
p omo e he eco e y o he esou ce.
Some ishe y has, howe e , aken place and
shows CPUE was 4.3 kg/ ap a a ca ch o 12 ons
in 2006. The managemen a ea has benne closed
in 2005 and 2006, bu was eopened wi h a quo a
on 200 ons in Augus 2007. In 2007 CPUE has
inc eased o app ox. 10.2 kg/ ap, as well as
ca ches and e o inc eased o 174 ons in 2007
and e o o 17 hund ed housand used aps.
P elimina y ca ch o 2008 is 107 ons.
No s anda dised index o CPUE and soak ime
has been p epa ed, owing o he lack o da a and
un- egula ly ecu ing ishe y in his a ea.
Resea ch Su eys
Owing o he b eakdown o he main engine a he
esea ch ship Adol Jensen, he su ey has been
cancelled in 2007 and 2008. No new su ey da a
is a ailable o he s ock assessmen and ad ice.
Ou look - O sho e Manii soq-Kangaamiu
Fishe y da a is e y spa se and hose a ailable
sugges an inc ease in CPUE along wi h a la ge
educ ion in ca ch since 2004.
Recommenda ions o he 2009 ishe y -
O sho e Manii soq-Kangaamiu
No new da a a e a ailable o 2008. Due o he
lack o su ey and ishe y da a no ad ice is gi en
o Manii soq-Kangaamiu o sho e.
Managemen a ea: Nuuk-Paamiu
The his o ical ca ch, CPUE and e o da a o he
ishe y in Nuuk-Paamiu insho e and o sho e
a eas a e summa ized in Table 2.
The Nuuk-Paamiu a ea has been an impo an
ishing a ea whe e o al ca ches peaked a mo e
han 5,000 ons in 2001. Howe e , ca ches he
ollowing yea we e app oxima ely 50% lowe
(2,531 ons) despi e only a 10% dec ease in
e o . This led o he ishe y CPUE insho e and
o sho e dec easing om 5.3 and 3.8 kg/ ap
espec i ely in 2001 o 2.8 kg/ ap in 2002 in bo h
a eas,. To al ca ches including insho e and
o sho e ha e been somewha s able a ound
Snow c ab s ock s a us and ad iso y epo
2009
17
2,300 ons du ing 2002-2005, pa ly as a esul o
low o e all e o and mo e ecen ly due o quo a
es ic ions. To al ca ches dec eased by 77% o
521 ons in 2007 (410 ons o sho e and 111 ons
insho e). Ca ches ha e been s eadily declining
concu en wi h a educ ion in e o , which has
been mo ing o sho e un il 2005 (Fig.32).
Insho e - Nuuk-Paamiu
Fishe y
Ca ches peaked a 4,157 ons in 2001 and hen
declined by mo e han 97% o 111 ons in 2007
(Table 2 and Fig. 33), while ishing e o declined
by 98%. P elimina y comme cial da a in 2008
shows a CPUE o 8.2 kg/ ap a a ca ch o 72
ons.
The dis ibu ion he ishe y in 2004 and 2006 has
been concen a ed nea he middle o he
managemen a ea in sub-a eas Fiskenæs-
Danasdyb and F ede ikshåb-Ra nsdyb. The e is,
howe e some ishe y in he no he n pa o he
a ea – God håb (Fig. 32). F om he s anda dised
CPUE index (Fig. 33) i appea s ha CPUE has
g adually inc eased du ing his pe iod om a low
o 2.8 kg/ ap in 2002 o 7.7.4 kg/ ap in 2006, bu
dec eased o 6.8 in 2007, despi e a 37% educ ion
in e o (Table 2).
Soak ime has g adually inc eased om 2003 o
2005 and had since a ied. In 2007 a e age soak
ime was app ox. 87 hou pe hauled aps lee
(Fig. 34).
Ou look - Insho e Nuuk-Paamiu
The e is no su ey unde aken in Nuuk-Paamiu
insho e hus ec ui men indices and o he
biological pa ame e s a e no a ailable. The
comme cial CPUE inc eased o 2007 as o al
ca ch and e o dec eased bu some conce n
ega ding sus ainabili y o he esou ce a highe
ca ch le els, due o he lack o biological da a.
Recommenda ions o he 2009 ishe y -
Insho e Nuuk-Paamiu
The e had been indica ions o imp o emen o he
esou ce biomass o e he las se e al yea s in a
scena io o dec easing ishing exploi a ion. I is
howe e , di icul o de e mine he ex en o he
imp o emen due o he lack o o he s ock
indices. I is he e o e ecommended ha he
ca ch le el o 700 ons o 2009.
O sho e - Nuuk-Paamiu
Fishe y
The dis ibu ion in he o sho e ishe y has
changed sligh ly in ecen yea s om a con inuous
dis ibu ion o e o along he inne edges o he
o sho e banks om he middle o he Nuuk-
Paamiu a ea and no hwa d in 2003 o e o
concen a ing a ound he middle o he Nuuk-
Paamiu (sub-a eas Fiskenæs-Danasdyb and
F ede ikshåb-Ra nsdyb) in 2004 and 2007 (Fig.
32). Only in 2005 and 2006, e o has been
alloca ed o a ishe y along he ou e edges o he
banks (Fyllas bank) in he no he n pa o Nuuk-
Paamiu .
F om 2000-2002, ca ches in Nuuk-Paamiu
o sho e declined om 1,339 o 761 ons (Table 2
and Fig. 35). Ca ch mo e han doubled o 1,611
ons in 2003 and u he inc eased o 2,033 ons
as e o dec eased o 302 housand ap hauls in
2005. In 2006 he ca ch dec eased o 969 ons
and has been g adually declining o 410 ons in
2007, which was no limi ed by he quo a o 1,600
ons. E o dec eased by 81% om 2005 o 2007.
In 2007 he e we e no landings o c ab om ul imo
June o mid Oc obe 2007 o he main indus y
componen (Royal G eenland) in Paamiu . P eli-
mina y ca ch is 292 ons o 2008.
S anda dised CPUE g adually inc ease om 3.8-
kg/ ap in 2001 o 7.9 kg/ ap in 2005 (Fig. 35).
Fo he pas wo yea s CPUE declined o 5.1
kg/ ap. P elimina y da a o 2008 show a CPUE
o 7.7 kg/ ap.
Snow c ab s ock s a us and ad iso y epo
2009
18
Mon hly ends in comme cial da a gene ally show
subs an ial declines in bo h ca ches and CPUE
du ing he yea , sugges ing he esou ce is being
deple ed conside ably as he ishing season
p og esses. The ishe y s a s in Janua y and has
he highes ca ch a es om Feb ua y o May.
CPUE s eadily declines du ing emainde o he
season (Fig. 36). The Feb-May da a indica e ha
ea ly-season CPUE in 2007 was compa able o
ha in 2006, a a lowe le el han du ing 2004-
2005.
Soak ime has been qui e s able and a ied om
63 o 77 hou pe hauled ap lee om 2001 o
2007. A e age soak ime in 2008 is 61 hou
app ox. 87 hou pe hauled aps lee (Fig. 36).
Resea ch Su eys
Owing o he b eakdown o he main engine a he
esea ch ship Adol Jensen, he su ey has been
cancelled in 2007 and 2008. No new su ey da a
is a ailable o he s ock assessmen and ad ice.
Ou look - O sho e Nuuk-Paamiu
No new su ey da a has been a ailable o he
pas wo yea s. The comme cial ca ches ha e
g adually declining. I is unce ain i educ ion is a
consequence o a low biomass o lack o in e es
o comme cial snow c ab ishe y in he manage-
men a ea.
Recommenda ions o he 2009 ishe y -
O sho e Nuuk-Paamiu
No new biological da a has been a ailable since
2006. CPUE has emained s able a a ound 7
kg/ ap since 2005 despi e a d op in 2006 and a
decline wi h app ox. 80% in ca ches om 2005 o
2007. To ake in o conside a ion ec ui men un-
ce ain ies, i is ecommended ha he ca ch le el
o 2009 does no exceed 1600 ons, iden ical wi h
he quo a o 2007 and 2008.
Special commen s
Owing o he cancelled su ey in 2007 and 2008,
he e is no ishe y-independen da a, o alida e
he appa en dec ease in he exploi able biomass
in his a ea.
Snow c ab s ock s a us and ad iso y epo
2009
19
Managemen A ea Yea
To al ca ch
( ons)
Quo a
Insho e
ca ch ( ons)
Insho e
CPUE
(kg/ ap)
Insho e e o
('000)
O sho e
ca ch ( ons)
O sho e
CPUE
(kg/ ap)
O sho e
e o ('000)
2000 -- -- -- -- -- -- -- --
2001 -- -- -- -- -- -- -- --
Upe na ik 2002 -- -- -- -- -- -- -- --
2003 -- -- -- -- -- -- -- --
2004 65 -- -- -- -- -- -- --
2005 -- 100 -- -- -- -- -- --
2006 0
2007 -- 0 -- -- -- -- -- --
2008* -- 0 -- -- -- -- -- --
2000 3,052 -- 2,940 4.8 613 112 5.5 20
2001 4,202 -- 3,950 3.1 1,274 252 3.6 70
Uummannaq-Diskobug 2002 3,319 -- 2,970 3.3 900 349 3.0 116
2003 2,739 -- 2,482 3.7 679 257 2.6 97
2004 2,341 -- 2,174 3.4 632 167 3.7 45
2005 1,500 1718 1,404 3.9 363 96 4.0 24
2006 1,134 1600 1,008 4.6 221 126 6.7 19
2007 697 1530 574 4.2 138 123 5.1 24
2008* 246 1400 189 5.1 37 57 5.2 11
2000 2,534 -- 491 2.8 175 2,043 6.4 319
2001 2,602 -- 327 2.9 113 2,275 4.6 495
Sisimiu 2002 2,724 -- 473 4.6 103 2,251 3.5 643
2003 1,633 -- 692 3.7 187 941 3.1 304
2004 1,432 -- 1,111 3.9 286 321 4.9 65
2005 1,125 900 891 6.5 137 234 6.4 37
2006 736 750 725 8.3 87 11 11.1 1
2007 784 850 559 7.4 75 225 12.8 18
2008* 414 800 365 10.0 36 49 12.1 4
2000 944 -- 563 4.3 131 381 7.6 50
2001 1,835 -- 1009 3.7 273 826 5.0 165
Manii soq-Kangaamiu 2002 1,775 -- 1032 3.8 272 743 2.7 275
2003 485 -- 40 3.5 12 445 2.8 160
2004 116 -- 78 2.4 33 38 2.1 18
2005 73 200 (insho e) 62 4.2 15 11 3.6 3
2006 72 100(insho e)' 61 4.3 14 11 4.3 3
2007 187 300 13 2.9 5 174 10.2 17
2008* 115 300 8 5.9 1 107 10.7 10
2000 3,769 -- 2,430 5.3 458 1,339 5.4 248
2001 5,077 -- 4,157 5.3 784 920 3.8 242
Nuuk-Paamiu 2002 2,531 -- 1,770 2.8 632 761 2.8 272
2003 2,315 -- 704 3.4 207 1,611 4.2 385
2004 1,795 -- 180 4.5 40 1,615 8.0 203
2005 2,295 -- 262 8.0 33 2,033 6.7 302
2006 1,173 1,800 204 7.3 28 969 3.0 328
2007 521 1,600 111 7.2 15 410 7.4 56
2008* 364 1600 72 8.2 9 292 9.3 31
2000 2 -- 0 -- -- 2 -- --
2001 822 -- 822 -- -- 0 -- --
Na saq-Qaqo oq 2002 643 -- 642 -- -- 1 -- --
2003 133 -- 123 -- -- 10 -- --
2004 541 -- 32 3.9 8 2 1.0 2
2005 76 -- 76 8.3 9 -- -- --
2006 0 -- -- -- -- -- -- --
2007 0 -- -- -- -- -- -- --
2008* 0-- -- -- -- -- -- --
Tables
Table 2. Ca ches, ca ch a es (CPUE) and e o in managemen insho e and o sho e a eas om 2000-
2008. *2008 da a is p elimina y and incomple e.
Snow c ab s ock s a us and ad iso y epo
2009
20
Figu es
Fig 1. Map o Wes G eenland ou lining he 6 managemen a eas as o 2004 o he snow c ab ishe y.
Snow c ab s ock s a us and ad iso y epo
2009
21
Yea
1996 1998 2000 2002 2004 2006 2008
Qou a and o al ca ch (000' ons)
0
5
10
15
20
25
30
35
Qou a
To al ca ch
Figu e 2. To al ca ch and quo a size om 1995-2007. Da a om 2008 is only p elimina y.
Fig. 3. Snow c ab landings in he 4 mos impo an managemen a eas o Wes G eenland 2000-2008 and
used o al e o . Da a o 2008 a e p elimina y and incomple e.
Yea
2000 2002 2004 2006 2008
To al ca ch ( ons)
0
2000
4000
6000
8000
10000
12000
14000
16000
To al e o ('000)
0
1000
2000
3000
4000
Disko Bay - Uummannaq
Sisimiu
Manii soq - Kangaamiu
Nuuk - Paamiu
To al e o
Snow c ab s ock s a us and ad iso y epo
2009
22
Fig. 4. Dis ibu ion o he c ab ishe y o Wes G eenland wi hin each managemen a ea om 2003 - 2008,
de i ed om logbook da a. Lines a e used o sepa a e managemen a eas.
2003
2004
2005
2006
2007
2008
Snow c ab s ock s a us and ad iso y epo
2009
23
LL
LG
LH
LJ
LK
LS
LM
LN
LP
LR
LA
LB
LD
LE
LF
13 14 1715 16 18 19 24
20 21 22 23 29
25 26 27 28 3430 31 32 33
Qeqe a suaq
Aasiaa
Qasigianngui
Ilulissa
61 62 63 6465 66 67
68
69
70
71 72
73 74
76
77
79
80
81
82
83
84
85
86 87
88
89 90
91 92
93 94
95
96
98
99
175
176
177
178
KF
KG
KH
KJ
14
KA
KB
KD
KE
13 1815 16 17 19 20 21 22
Sisimiu
51 52 54 55 58 60
25 26
27 28
29
32
33
34
17 18 19 20 21
1
2
3
4
5
6
7
8
9
10
11
12
35
42
44 45
46
47 48
49
50
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
Fig. 5a. Map showing he loca ion o su ey s a ions in Disko Bay, A ea 1 (No h) and A ea 2 (Sou h).
Fig. 5b. Map showing he loca ion o insho e and o sho e su ey s a ions in Sisimiu .
Snow c ab s ock s a us and ad iso y epo
2009
24
Manii soq-Kangaamiu
Fiskenæs-Danasdyb
God håb
Nuuk-Paamiu
F ede ikshåb-Ra nsdyb
L
J
M
I
H
K
NUUK
G
C
D
E
F
A
B
NUUK
O sho e Su ey A eas
Manii soq-Kangaamiu
Nuuk-Paamiu
0
0
Fig. 5c. Map showing he loca ion o su ey s a ions om Manii soq-Kangaamiu and Nuuk-Paamiu (and
sub-a eas).
Snow c ab s ock s a us and ad iso y epo
2009
25
Fig. 6. Annual dis ibu ion o ishing e o in Uummannaq-Disko Bay om 2003-2008. Da a o 2008 is p eli-
mina y and incomple e.
2003
2004
2005
2006
2007
2008
Snow c ab s ock s a us and ad iso y epo
2009
32
Fig. 14. The pe cen age o shell condi ions (1-5) o adul legal-sized male c abs ( 100mm CW) sampled in
Disko Bay Sou h and Disko Bay No h, Disko Bay 1998 o 2008.
Fig. 15. Annual ends in he a io be ween p imipa ous and mul ipa ous in Disko Bay Sou h and Disko Bay
No h, Disko Bay 2000-2008.
Disko Bay - Sou h
Yea
1998 2000 2002 2004 2006 2008
Pe cen (%)
0
20
40
60
80
100
Disko Bug - No h
Yea
1998 2000 2002 2004 2006 2008
Pe cen (%)
0
20
40
60
80
100
SC1
SC2
SC3
SC4
SC5
Disko Bay - No h
Yea
1998 2000 2002 2004 2006 2008
P imipa ous emale : (p imipa ous + mul ipa ous)
0.0
0.2
0.4
0.6
0.8
1.0
Disko Bay - Sou h
Yea
1998 2000 2002 2004 2006 2008
P imipa ous emale : (p imipa ous + mul ipa ous)
0.0
0.2
0.4
0.6
0.8
1.0
Snow c ab s ock s a us and ad iso y epo
2009
33
Fig. 16. The dis ibu ion and c ab ishe y in Sisimiu insho e and o sho e in 2003 - 2008. The coas al line
indica es he basis- line sepa a ing he o sho e om he insho e. Da a om 2008 is p elimina y and
incomple e.
2003
2004
2003
2005
2006
2007
2008
Snow c ab s ock s a us and ad iso y epo
2009
34
Insho e Sisimiu
Mon h
0 2 4 6 8 10 12
CPUE (kg/ ap)
0
2
4
6
8
10
12
14
16
2003
2004
2005
2006
2007
2008
Fig. 17. Mon hly ends in CPUE (kg pe ap) om he ishe y in Sisimiu insho e om 2003 o 2008. Da a o
2008 is incomple e.
Insho e Sisimiu
Yea
1998 2000 2002 2004 2006 2008
CPUE (kg/ ap)
0
2
4
6
8
10
12
To al ca ch ( ons)
0
500
1000
1500
2000
2500
CPUE (kg/ ap)
Uppe con idence limi
Lowe con idense limi
To al ca ch
Fig. 18. S anda dised CPUE index and o al ca ch based on logbook in o ma ion insho e Sisimiu om 2000-
2008. Da a o 2008 is incomple e.
Snow c ab s ock s a us and ad iso y epo
2009
35
Insho e Sisimiu
Yea
1998 2000 2002 2004 2006 2008
GLM index soake ime (hou )
0
20
40
60
80
100
120
lsmeans ish ime
Uppe con idence limi s
Lowe con idence limi s
Fig. 19. S anda dised soak ime index based on logbook in o ma ion insho e Sisimiu om 2000-2008. Da a
o 2008 is incomple e.
Sisimiu insho e
Yea
1996 1998 2000 2002 2004 2006 2008
CPUE (kg/ ap)
0
5
10
15
20
25
CPUE (kg/ ap)
CPUE in he e e ence pe iod
Lowe con idence limi s
Uppe con idence limi s
Fig. 20. Annual ends in CPUE (kg/ ap S.E.) o legal-size males ( 100mm CW) om ap su eys in
Sisimiu insho e om 1997 o 2008. The mean CPUE o he e e ence pe iod (1999-2003) in Sisimiu
insho e is indica ed wi h a line.
Snow c ab s ock s a us and ad iso y epo
2009
36
Yea
1996 1998 2000 2002 2004 2006 2008
A e age ca apace wid h (mm)
110
112
114
116
118
120
Sisimiu insho e
Sisimiu o sho e
Sisimiu - Nd . S øm jo d
Sisimiu insho e - CW in he e e ence pe iod
Sisimiu o sho e - CW in he e e ence pe iod
Fig. 21. Annual ends in he mean ca apace wid h (CW) o legal-size males ( 100mm CW) om ap
su eys in Sisimiu insho e (1997-2008) and Sisimiu o sho e (1999–2008). The mean CW o he e e ence
pe iod (1999-2003) in Sisimiu insho e and (2000–2003) in Sisimiu o sho e is indica ed wi h a line.
Sisimiu insho e
Yea
2000 2002 2004 2006 2008
Abundance (NPUE)
0
1
2
3
4
5
6
7
8
ADO1: 82.2 - 100 mm CW
ADO1 in he e e ence pe iod
Fig. 22. Annual ends in he abundance NPUE (No. c abs pe ap S.E) o adolescen males (ADO-1: 82.2-
100mm CW) expec ed o ec ui o he ishe y he ollowing yea in Sisimiu insho e a eas om 2000 o 2008.
The mean NPUE o he e e ence pe iod (1999-2003) in Sisimiu insho e is indica ed wi h a line.
Snow c ab s ock s a us and ad iso y epo
2009
37
Sisimiu insho e
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Adundance (NPUE)
0
1
2
3
4
5
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (mm)
0
1
2
3
4
5
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (mm)
0
1
2
3
4
5
Adolescen males
Adul males
Sisimiu o sho e
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Ca apace widh (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Adolescen males
Adul males
2000
2001
2002
2000
2001
2002
Snow c ab s ock s a us and ad iso y epo
2009
38
Sisimiu insho e
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Adolescen males
Adul males
Sisimiu o sho e
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Adolescen males
Adul males
2003
2004
2005
2003
2004
2005
Snow c ab s ock s a us and ad iso y epo
2009
39
Fig. 23. Size dis ibu ion o adolescen and adul males om su eys in Sisimiu insho e and o sho e om
2000 o 2008.
Sisimiu insho e
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Adolescen males
Adul males
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Sisimiu o sho e
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Ca apace wid h (mm)
020 40 60 80 100 120 140 160
Abundance (NPUE)
0
1
2
3
4
5
Adolescen males
Adul males
2006
2007
2008
2006
2007
2008
Snow c ab s ock s a us and ad iso y epo
2009
40
Fig. 24. The pe cen age o shell condi ions (1-5) o legal-size adul males ( 100mm CW) sampled in ap
su eys in Sisimiu insho e and o sho e om 2000 o 2008.
Sisimiu insho e
Yea
1998 2000 2002 2004 2006 2008
P imipa ous emale : (p imipa ous + mul ipa ous)
0.0
0.2
0.4
0.6
0.8
1.0
Fig. 25. Annual ends in he a io be ween p imipa ous and mul ipa ous emales in Sisimiu insho e om
2000 o 2008.
Sisimiu insho e
Yea
1998 2000 2002 2004 2006 2008
Pe cen (%)
0
20
40
60
80
100
SC1
SC2
SC3
SC4
SC5
Sisimiu o sho e
Yea
1998 2000 2002 2004 2006 2008
Pe cen (%)
0
20
40
60
80
100
SC1
SC2
SC3
SC4
SC5
Snow c ab s ock s a us and ad iso y epo
2009
41
O sho e Sisimiu
Yea
1998 2000 2002 2004 2006 2008
CPUE (kg/ ap)
0
2
4
6
8
10
12
To al ca ch ( ons)
0
500
1000
1500
2000
2500
CPUE (kg/ ap)
Uppe con idence limi s
Lowe con idence limi s
To al ca ch
Fig. 26. S anda dised CPUE index and o al ca ch based on logbook in o ma ion o sho e Sisimiu om
2000-2008. Da a o 2008 is incomple e.
O sho e Sisimiu
Mon h
0 2 4 6 8 10 12
CPUE (kg/ ap)
0
2
4
6
8
10
12
14
16
2003
2004
2005
2006
2007
2008
Fig. 27. Mon hly ends in CPUE (kg pe ap) om he ishe y in Sisimiu o sho e om 2003 o 2008. Da a
o 2008 is incomple e.
Snow c ab s ock s a us and ad iso y epo
2009
48
