GROWTH AND SURVIVAL OF 0 + ABFT Thunnus thynnus FINGERLINGS KEPT IN TANKS

Ortega-García, Aurelio; de-la-Gándara, Fernando; Méndez-Vivancos, Fernando; García, J.

Ortega-García, Aurelio,de-la-Gándara, Fernando,Méndez-Vivancos, Fernando,García, J.

Abstract

This article shows the most relevant results obtained between August 2017 and October 2018 with two batches of 0+ tunas: cultured tunas (CT) born in the IEO facilities in June 2017 and wild tunas (WT) captured in Mazarron Bay in September 2017. Fertilized ABFT eggs were collected from cages owned by PisciAlba and obtained larvae were cultured in IEO facilities. At the end of July 2017, 500 fingerlings (CT, 2 g average weight) were move to ICRA facilities on 29th July and placed in a 1000 m3 tank. At the end of September 2017 mean weight were 350 gr. In that moment, a total of 68 0+ ABFT fingerlings (WT, 414 g mean weight), were captured from the Mazarron Bay and placed in a 3500 m3 tank in ICRA. From this moment temperature ranged between 18 and 27ºC, and feeding consisted in bait, mainly Sardinella aurita and Scomber scombrus, but also Scomber japonicus, Engraulis encrasicolus and Clupea harengus. During November 2017, mortality increased in CT without any symptoms of infectious disease. 80 healthier CT were then moved to a greater tank (2500 m3 ) and in March 2018, when completely recovered, they were placed together with WT and both batches were cultured in the same tank up to now. During the 13 months period mortality observed in CT was high (close to 85%) while mortality in WT was lower than 15%. Growth was also slightly faster in WT. Feeding intake ranged during the whole period between 3 and 26%, and feeding conversion rate estimated was close to 12. At the end of October 2018 mean weight of population was 11 kg.

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GROWTH AND SURVIVAL OF 0 + ABFT Thunnus thynnus FINGERLINGS KEPT IN TANKS

Author: Ortega-García, Aurelio,de-la-Gándara, Fernando,Méndez-Vivancos, Fernando,García, J.

Source: https://digital.csic.es/bitstream/10261/313913/4/2054.pdf

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GROWTH AND SURVIVAL OF 0+ ABFT Thunnus hynnus FINGERLINGS KEPT IN TANKS
Au elio O ega*, Fe nando de la Gánda a, Fe nando Méndez and Jaime Ga cía
Cen o Oceanog á ico de Mu cia (Ins i u o Español de Oceanog a ía), 30860, Pue o de Maza ón (Mu cia),
Spain
*email: [email p o ec ed]
This a icle shows he mos ele an esul s ob ained be ween Augus 2017 and Oc obe 2018 wi h wo ba ches o 0+ unas:
cul u ed unas (CT) bo n in he IEO acili ies in June 2017 and wild unas (WT) cap u ed in Maza on Bay in Sep embe 2017.
Fe ilized ABFT eggs we e collec ed om cages owned by PisciAlba and ob ained la ae we e cul u ed in IEO acili ies. A
he end o July 2017, 500 inge lings (CT, 2 g a e age weigh ) we e mo e o ICRA acili ies on 29 h July and placed in a 1000
m3 ank. A he end o Sep embe 2017 mean weigh we e 350 g . In ha momen , a o al o 68 0+ ABFT inge lings (WT, 414
g mean weigh ), we e cap u ed om he Maza on Bay and placed in a 3500 m3 ank in ICRA. F om his momen empe a u e
anged be ween 18 and 27ºC, and eeding consis ed in bai , mainly Sa dinella au i a and Scombe scomb us, bu also Scombe
japonicus, Eng aulis enc asicolus and Clupea ha engus.
Du ing No embe 2017, mo ali y inc eased in CT wi hou any symp oms o in ec ious disease. 80 heal hie CT we e hen
mo ed o a g ea e ank (2500 m3) and in Ma ch 2018, when comple ely eco e ed, hey we e placed oge he wi h WT and
bo h ba ches we e cul u ed in he same ank up o now. Du ing he 13 mon hs pe iod mo ali y obse ed in CT was high (close
o 85%) while mo ali y in WT was lowe han 15%. G ow h was also sligh ly as e in WT. Feeding in ake anged du ing he
whole pe iod be ween 3 and 26%, and eeding con e sion a e es ima ed was close o 12. A he end o Oc obe 2018 mean
weigh o popula ion was 11 kg.