Incorporation of a Krill Protein Hydrolysate into the feeding regime of Atlantic cod (Gadus morhua) larvae - effect on growth and survival
Atlantic cod (Gadus morhua) is being developed as a species for commercial scale aquaculture production. Years of study concerning the nutritional requirements of marine fish larvae have focused on the omega-3 (ω-3) fatty acid and lipid requirements, overshadowing the role and importance of protein...
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| Format: | Thesis |
| Language: | English |
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Memorial University of Newfoundland
2009
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| Online Access: | https://research.library.mun.ca/8806/ https://research.library.mun.ca/8806/1/Rowsell_NicoleJoy.pdf |
| Summary: | Atlantic cod (Gadus morhua) is being developed as a species for commercial scale aquaculture production. Years of study concerning the nutritional requirements of marine fish larvae have focused on the omega-3 (ω-3) fatty acid and lipid requirements, overshadowing the role and importance of protein and free amino acids in the larval diet. This study incorporated a Krill Protein Hydrolysate (Krill Protein) into a fatty acid/lipid-rich Artemia enrichment regime and examined the contribution that amino acids make to the growth and survival of Atlantic cod larvae. -- Atlantic cod larvae were fed Artemia enriched in AlgaMac 3010, DHA Selco and a Krill Protein Hydrolysate in eight different feeding regimes. The eight feeding treatments also included an unenriched Artemia treatment, and all were carried out in triplicate during the Artemia feeding stage (a 20 day period). -- During the Artemia enrichment, the Krill Protein Hydrolysate incorporated the highest proportion of phospholipid (25.5% total lipid), the most arachidonic acid (7.7% fatty acids) and DHA Selco and Krill Protein contributed similar proportions of total lipid (5.6%; 5.5%). Unenriched Artemia contained the highest concentrations of all free amino acids (FAA) studied. FAA incorporated by the Artemia enriched with Krill Protein and AlgaMac 3010, respectively, expressed as a percent of FAA concentrations in unenriched Artemia were: alanine (54% of unenriched; 50% of unenriched), leucine (39%; 66%), serine (44%; 56%), isoleucine (40%; 67%), lysine (32%; 59%), and valine (44%; 62%). -- Growth during the experiment, measured as total length (mm), was significantly improved in the larvae fed DHA Selco/Krill Protein enriched Artemia on alternating days (P=0.010). The DHA Selco/Krill Protein treatment produced the best specific growth rate (2.55), in fact, all treatments containing Krill Protein produced significantly higher SGRs than that found in the unenriched treatment (P<0.05). Alanine, leucine, serine, isoleucine, lysine and valine concentrations, ... |
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