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• W371118338 abstract "Significant advances have been made in controlled breeding and knowledge ofenvironmental requirements for culture of larval black sea bass (Centropristis striata), butthere still is relatively little published data on the nutritional requirements of the larvalstages, including optimal methods for live prey enrichment with essential fatty acids.The objectives of this study were to determine the arachidonic acid (ARA, 20:4n-6)requirements of black sea bass larvae from the first feeding through metamorphic stagesapproximately 24 days post-hatching (d24ph).Thirty 15-L aquaria were stocked with d1ph yolksac stage larvae at 100 ind./L.Salinity (34 g/L), temperature (22 °C), photoperiod (18L: 6D), light intensity (1,000 lux),diffused aeration (100 mL/min) and D.O. (> 5 mg/L) were held constant. Backgroundmicroalgae Nannochloropsis oculata was added daily to maintain 300,000 cells/L. Todetermine ARA requirements of larvae, live prey organisms, rotifers (Brachionus sp.) andArtemia were enriched with emulsions containing 10% docosahexaenoic acid, DHA(22:6n-3) and five different levels of ARA (0, 6, 8, 10 and 12% total fatty acids, TFA).In a sixth treatment, live prey was enriched with Algamac 2000 (26% DHA, 0% ARA), acommercial fatty acid booster. Rotifers were fed from d2ph at 10 ind./mL, increasing to23 ind./mL by d18ph. On d18ph Artemia were fed at 0.5 ind./mL, increasing to 3ind./mL on d22ph. Rotifer feeding ceased on d20ph. Larvae were sampled on d4, d10,d17 and d24ph to monitor survival and growth (NL, wet wt. and dry wt.). On d24ph,hypersaline (55 g/L) stress resistance (ST-50) was evaluated. To measure Na,K,ATP-aseexpression, salinity was increased to a sublethal level of 42 g/L and larvae were sampledat 0 h and after 24 h for mRNA analysis by quantitative real-time PCR (qRT-PCR). On d24ph, larval fatty acid profiles reflected dietary levels. Larval NL, wet wt.and dry wt. increased steadily in all treatments during the study, with no significant (P >0.05) treatment effects. On d24ph, no significant treatment differences in survival (range= 24.3-32.7%) or hypersaline stress (range = 27.1-31.8) resistance were evident.However, larvae fed diets supplemented with ARA (6-12% TFA) demonstrated asignificant (P < 0.05) increase in relative mRNA expression of Na+ K+ ATPase after 24 h,whereas larvae fed 0% ARA and Algamac showed no increase. The results indicate thatdietary supplementation with ARA at 6-12% promoted the adaptive physiologicalresponses to hypersalinity stress and hypo-osmoregulatory ability in black sea basslarvae." @default.
• W371118338 created "2016-06-24" @default.
• W371118338 creator A5013796158 @default.
• W371118338 date "2009-01-01" @default.
• W371118338 modified "2023-09-23" @default.
• W371118338 title "Growth survival and resistance to hypersaline stress in larval black sea bass (Centropristis striata) fed varying levels of dietary arachidonic acid (20:4n-6)" @default.
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• W371118338 hasPublicationYear "2009" @default.
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