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Changes of Protein and Lipid Contents,Amino Acid and Fatty Acid Compositions in Eggs and Yolk-Sac Larvae of American Shad(alosa sapidissima)

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Journal of Ocean University of China 2018年第2期17卷 413-419页

作者： LIU Zhifeng GAO Xiaoqiang YU Jiuxiang WANG Yaohui GUO Zhenglong HUANG Bin LIU Baoliang HONG Lei Key Laboratory for Sustainable Development of Marine Fisheries of Ministry of Agriculture Qingdao Key Laboratory for Marine Fish Breeding and BiotechnologyYellow Sea Fisheries Research InstituteChinese Academy of Fishery SciencesQingdao 266071China Fisheries College Ocean University of ChinaQingdao 266003China Jiangsu Zhongyang Group Nantong 226600China

To investigate the changes of the biochemical composition of American shad(alosa sapidissima) eggs and larvae at embryonic and early larval stages, samples were collected at different development stages from artificial fertilization to the end of yolk absorption including 2 h, 12 h and 30 h after fertilization and newly hatched larvae including 1 and 3 days after hatching. The composition of lipid, fatty acids, protein and amino acids were analyzed. The content of total protein exhibited a decreasing trend during embryogenesis and larval development, and a significant reduction was detected after hatching(P < 0.05). The total lipid content remained relative stable. A significant reduction was detected in almost all amino acids after hatching except for glycine(P <0.05), while a significant decrease was found in the content of cysteine, proline, tyrosine, valine, isoleucine, leucine and phenylalanine during the yolk-sac phase(P < 0.05). On the other hand, all the groups of fatty acids remained stable during the period of embryogenesis. But after hatching, a significant decrease was found in the content of C18:2n-6, C18:3n-6, SFA and ratio of EPA/ARA(P < 0.05), while a significant increase was found in the content of C18:3n-3, C20:4n-6, C22:6n-3 and ratio of n-3/n-6(P < 0.05). In conclusion, the combined data suggested that American shad utilizes the protein content as preferential energy substrates during embryonic and early larval developments with some specificity in the consumption of different amino acids.

关键词： alosa sapidissima development lipid protein amino acid fatty acid

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