Nutritional evaluation of rotifers in rearing tanks without water exchange during seed production of amberjack Seriola dumerili |
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Authors: | Takeshi Yamamoto Kazuhisa Teruya Takashi Hara Hiroto Hokazono Isao Kai Hiroshi Hashimoto Hirofumi Furuita Hiroyuki Matsunari Keiichi Mushiake |
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Affiliation: | (1) Feed Research Group, Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, Hiruta, Tamaki Mie, 519-0423, Japan;(2) Stock Enhancement Technology Development Center, National Research Institute of Aquaculture, Fisheries Research Agency, Kamiura, Saiki Oita, 879-2602, Japan;(3) Marine Biological Technology Center, Nippon Suisan Kaisha, Tsurumi, Saiki Oita, 876-1204, Japan;(4) Kagoshima Prefectural Fisheries Technology and Development Center, Iwamoto, Ibusuki Kagoshima, 891-0315, Japan;(5) Miyazaki Fisheries Promotion Association, Kumanoe, Nobeoka Miyazaki, 889-0322, Japan;(6) Shibushi Station, National Center for Stock Enhancement, Fisheries Research Agency, Shibushi Kagoshima, 899-7101, Japan |
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Abstract: | We evaluated the nutrient contents of rotifers sampled from larval-rearing tanks (tank rotifers) without water exchange during the seed production of amberjack Seriola dumerili at three facilities (Kamiura, Kagoshima, and Miyazaki) and compared them with the nutrient contents of freshly enriched rotifers. Compared to the enriched rotifers, the lipid contents, especially neutral lipids and proportion of 22:6n-3, tended to decrease in the tank rotifers. These trends were clearer at Miyazaki where the tank rotifers were sampled before daily supplementation of microalgae (Nannochloropsis). Crude protein content of the tank rotifers did not decrease markedly although the proportion of lysine tended to decrease. Vitamin C and E contents of the tank rotifers decreased significantly only at Miyazaki. Calcium content of the tank rotifers increased at Kamiura and Miyazaki, and the increases in iron and manganese contents of the tank rotifers at Miyazaki and zinc content at Kagoshima were pronounced. These results suggest that the nutritional value of rotifers in larval-rearing tanks without water exchange can be maintained by appropriate supplementation of microalgae. The effect of certain minerals that became high in tank rotifers on subsequent larval development requires further investigation. |
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Keywords: | Amino acid Fatty acid Mineral Rotifer Seriola dumerili Vitamin |
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