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Further clarification of winter energy and protein requirements at the optimum feeding frequency for yellowtail

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Abstract:

SUMMARY:

This is another report from a series of studies aimed at determining the energy and protein requirements based on the optimum feeding frequency of yellowtail during the winter season. Experiments were conducted at Mie and Oita Prefectures, Japan, employing extruded pellets of known digestible energy (DE) and digestible protein (DP) values. Four groups of fish were fed at frequencies of five, three, two, and one time(s) per week. The most efficient feed performance was obtained for the feeding frequenecy of three times per week. The DE and DP requirements calculated based on the feeding rate at this frequency were 38.7 kcal and 2.8 g/kgBW per day (14.3–17.3°C) in Mie and 30.4 kcal and 2.2 g/kgBW per day (13.8–17.5°C) in Oita, respectively. The present results and the observations on the changes of the contents in digestive tracts tallied with our previous work, confirming that the optimum feeding frequency was three times per week.

Keywords: Seriola quinqueradiata; energy requirement; feeding rate; intestine; optimum feeding; protein requirement; stomach; yellowtail

Document Type: Research Article

Affiliations: 1: Laboratory of Fish Nutrition, Tokyo University of Fisheries, Minato, Tokyo 108-8477, 2: Owase Branch, Fisheries Research Institute of Mie, Owase, Mie 519-3602 and 3: Oita Institute of Marine and Fisheries Research Science, Oita 879-2602, Japan

Publication date: 2001-02-01

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