Nutritional evaluation of live food organisms and commercial dry feeds used for seed production of amberjack Seriola dumerili |
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Authors: | Takeshi Yamamoto Kazuhisa Teruya Takashi Hara Hiroto Hokazono Hiroshi Hashimoto Nobuhiro Suzuki Yasuro Iwashita Hiroyuki Matsunari Hirofumi Furuita Keiichi Mushiake |
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Affiliation: | 1. Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, 519-0423, Tamaki, Mie, Japan 2. Stock Enhancement Technology Development Center, National Research Institute of Aquaculture, Fisheries Research Agency, Kamiura, 879-2602, Saiki, Oita, Japan 3. Marine Biological Technology Center, Nippon Suisan Kaisha, 876-1204, Saiki, Oita, Japan 4. Kagoshima Prefectural Fisheries Technology and Development Center, 891-0315, Ibusuki, Kagoshima, Japan 5. Shibushi Station, National Center for Stock Enhancement, Fisheries Research Agency, 899-7101, Shibushi, Kagoshima, Japan 6. Department of Fisheries, School of Marine Science and Technology, Tokai University, 424-8610, Shimizu, Shizuoka, Japan
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Abstract: | To improve the nutritional quality of live foods and dry feeds ordinarily used for the seed production of amberjack Seriola dumerili, the nutrient contents of rotifers, Artemia nauplii and commercial feeds used in two larval production stations were evaluated. For comparison of the nutrient contents, artificially produced larvae, wild-caught juveniles and wild zooplankton samples were also analyzed. The proportions of 22∶6n-3 in the polar lipid of the cultured larvae increased by feeding the dry feeds. The taurine contents of the cultured larvae reflected the contents of their foods (rotifersArtemia nauplii). The taurine content and the proportion of 22∶6n-3 in Acartia spp. were higher than in foods fed to the larvae. These parameters in the wild juveniles were higher than the cultured ones. The A/E ratios [(each essential amino acid/total essential amino acids)×1000] of the total amino acids of the live foods and dry feeds were similar to those of the cultured larvae, except for the lower ratios of histidine, arginine, threonine and lysine in the live foods. The mucosal folds of the intestine of the cultured larvae did not show typical signs of dietary phospholipid deficiency. These results suggest that requirements of nutrients such as 22∶6n-3 and taurine should be determined for mass production of amberjack seeds. |
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Keywords: | amino acid Artemia dry feed fatty acid larvae rotifer Seriola dumerili taurine |
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