IMPORTANCE OF DIETARY TAURINE AND SELENIUM ON GROWTH AND SURVIVAL OF ATLANTIC BLUEFIN TUNA Thunnus thynnus LARVAE

de-la-Gándara, Fernando; Ortega-García, Aurelio; Méndez-Vivancos, Fernando; Tocher, Douglas R.; Betancor, M.B.; Martínez-Llorens, S.; Mourente, Gabriel

de-la-Gándara, Fernando,Ortega-García, Aurelio,Méndez-Vivancos, Fernando,Tocher, D.R.,Betancor, M.B.,Martínez-Llorens, S.,Mourente, Gabriel

Abstract

One of the most important bottleneck in the farming of Atlantic bluefin tuna (ABT) is the growth and survival during the larval rearing phase, mainly related with the diet quality. For the last ten years the Spanish Institute of Oceanography (IEO) in Mazarrón (Murcia, SE Spain) has developed a technique for ABT larval rearing and juvenile production. Taurine and selenium are essential water soluble compounds in live preys and inert diets for ABT larvae and juveniles. To know the importance of dietary taurine and selenium on growth and survival of ABT larvae, two experiments have been carried out with different taurine (Exp1) and selenium (Selplex® ) (Exp2) doses added to rotifers enriched with ALGAMAC 3050® . Both experiments were finished at 14 days post hatching. ABT fertilized eggs were collected from captive breeders spawning spontaneously in floating cages in the area. The eggs, transported to the IEO facilities, were quantified, cleaned, selected by buoyancy and distributed randomly in 1400 L fiber cylindrical glass tanks at a density of 10 ABT eggs per liter, whereas prey density was maintained at 5 rotifers per mL. Temperature ranges were: 24.0±0.5ºC and 26.0±0.5ºC for Exp1 and Exp2, respectively. Fig 1 shows the growth results in size for both experiments at 14 dph. Survival in both cases was close to 10% with no significant differences due to the different treatments. The lowest growth in size was observed in larvae fed dose 0 in both experiments Standard length average (mm ± confidence intervals) in Exp1 and Exp2 at 14 dph. Letters indicate statistically significant differences (95%)

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IMPORTANCE OF DIETARY TAURINE AND SELENIUM ON GROWTH AND SURVIVAL OF ATLANTIC BLUEFIN TUNA Thunnus thynnus LARVAE

Author: de-la-Gándara, Fernando,Ortega-García, Aurelio,Méndez-Vivancos, Fernando,Tocher, D.R.,Betancor, M.B.,Martínez-Llorens, S.,Mourente, Gabriel

Source: https://digital.csic.es/bitstream/10261/313889/4/2053.pdf

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IMPORTANCE OF DIETARY TAURINE AND SELENIUM ON GROWTH AND SURVIVAL OF
ATLANTIC BLUEFIN TUNA Thunnus hynnus LARVAE
Fe nando de la Gánda a*, Au elio O ega, Fe nando Méndez, Douglas R. Toche , Mónica Be anco ,
Sil ia Ma ínez-Llo ens and Gab iel Mou en e
Plan a Expe imen al de Cul i os Ma inos, Ins i u o Español de Oceanog a ía (IEO), 30860, Pue o de
Maza ón (Mu cia), Spain
[email p o ec ed]
One o he mos impo an bo leneck in he a ming o A lan ic blue in una (ABT) is he g ow h and su i al du ing he
la al ea ing phase, mainly ela ed wi h he die quali y. Fo he las en yea s he Spanish Ins i u e o Oceanog aphy (IEO) in
Maza ón (Mu cia, SE Spain) has de eloped a echnique o ABT la al ea ing and ju enile p oduc ion. Tau ine and selenium
a e essen ial wa e soluble compounds in li e p eys and ine die s o ABT la ae and ju eniles. To know he impo ance o
die a y au ine and selenium on g ow h and su i al o ABT la ae, wo expe imen s ha e been ca ied ou wi h di e en
au ine (Exp1) and selenium (Selplex®) (Exp2) doses added o o i e s en iched wi h ALGAMAC 3050®. Bo h expe imen s
we e inished a 14 days pos ha ching. ABT e ilized eggs we e collec ed om cap i e b eede s spawning spon aneously
in loa ing cages in he a ea. The eggs, anspo ed o he IEO acili ies, we e quan i ied, cleaned, selec ed by buoyancy and
dis ibu ed andomly in 1400 L ibe cylind ical glass anks a a densi y o 10 ABT eggs pe li e , whe eas p ey densi y was
main ained a 5 o i e s pe mL. Tempe a u e anges we e: 24.0±0.5ºC and 26.0±0.5ºC o Exp1 and Exp2, espec i ely. Fig 1
shows he g ow h esul s in size o bo h expe imen s a 14 dph. Su i al in bo h cases was close o 10% wi h no signi ican
di e ences due o he di e en ea men s. The lowes g ow h in size was obse ed in la ae ed dose 0 in bo h expe imen s
S anda d leng h a e age (mm ± con idence in e als) in Exp1 and Exp2 a 14 dph. Le e s indica e s a is ically signi ican
di e ences (95%)