Nutritional Factors Affecting Stress Resistance in the Larval Mahimahi Coryphaena hippurus
| Autor: | Terri Nagao, Harry Ako, Henry Kitagawa, Robert Cantrell, Amy Ogasawara, Syd Kraul, Karen Brittain |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | Journal of the World Aquaculture Society. 24:186-193 |
| ISSN: | 1749-7345 0893-8849 |
| DOI: | 10.1111/j.1749-7345.1993.tb00007.x |
| Popis: | Recent improvements in enriching Artemia make mahimahi culture possible without using copepods. Mahimahi survive better when cultured copepods Euterpina acutifrons are used, especially when the larvae are under stresses such as high stocking density, cold weather, or the rigors of metamorphosis. This study looked at some differences between copepods and enriched Artemia.This study tested stress resistance by holding postlarval (PL) mahimahi out of water in a hand net for varying periods of time. Recovery from this stress shock was higher in PLs whose diet was higher in docosahexaenoic acid (DHA). DHA appeared to play an important role in stress resistance. High eicosapentaenoate (EPA) or high HUFA did not confer stress resistance when DHA levels were low. Copepods contained higher levels of many essential amino acids in addition to higher levels of DHA compared with enriched brine shrimp. Larvae sickened by disease appeared to lose fat, including DHA, but they conserved DHA relative to other fatty acids. Even when sick, mahimahi larvae fed a copepod diet resisted stress better than larvae fed an enriched brine shrimp diet. Optimal Artemia enrichment levels of DHA for mahimahi have not been reached and this may explain why it has been difficult for others to raise this fish consistently. E. acutifrons is relatively easy to culture, but may not be practical for commercial hatcheries, due to low yield (less than 10 g per 100 L per week). |
| Databáze: | OpenAIRE |
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