Nutritional studies on early larval and juvenile stages of Yellowfin tuna, Thunnus albacores- an approach to formulate nutritionally balance diet for mass seedling production

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  • キハダ仔稚魚の栄養要求に関する研究　―種苗生産用飼料開発への取り組み

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Abstract

[Abstract]Yellowfin tuna (YFT), Thunnus albacares is one of the most harvested fish around the world. Although successful spawning of this species has started almost two decades ago at the Achotines Laboratory of the Inter-American Tropical Tuna Commission (IATTC), Las Tablas, Los Santos, Panama, the nutritional requirements of this species are still unknown. Providing correct nutrition to the broodstock ensures the highest quality of eggs and fecundity, hatchability and high larval survival. While, development of a nutritionally balanced diet is a prerequisite for mass seedling production in hatchery condition which can easily switch from supply of expensive live prey including fish larvae as well, it is still far away of establishment for YFT juvenile. Therefore, this study was done to understand the basic nutritional requirements of this valuable species. Periodic sampling of broodstock diets including squid, sardine and commercial pellet, larval feed including rotifers, Artemia, newly hatched larvae and wild zooplankton (copepod, collected from adjacent sea) were done. The proximate and fatty acid composition of those samples revealed that the present larval feeding practice is suboptimal and unable to meet the maximum growth as compared with other scombroid. Restructuring of broodstock feeding is necessary with proper supplementation of docosahexaenoic acid (DHA). The water quality parameters during the experimental period were fairly constant and may have no effect on spawning or hatching rate. It was found that the minimum protein and lipid content under this experimental condition might be ca. 12.7 and 1.3%, respectively on wet weight basis. The preliminary information about the nutritional status obtained from this study will greatly help to develop nutritionally balanced diet for YFT, and further will ensure the mass production of seedlings in hatchery condition in near future.

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