飼育下におけるスケトウダラ成魚の摂食量と成長

• Published in: NIPPON SUISAN GAKKAISHI
• Main Authors: 吉田, 英雄, 桜井, 泰憲
• Format: Article in Journal/Newspaper
• Language: Japanese
• Published: 日本水産学会
• Subjects: 666; Theragra chalcogramma
• Online Access: http://hdl.handle.net/2115/35532; https://doi.org/10.2331/suisan.50.763

Food consumption rate and growth rate of the adult walleye pollock were measured at different temperatures (2-7, 4-10 and 9-15°C), body sizes (33-35, 35-39 and 39-45cm) and foods (juvenile walleye pollock, squid and sandlance). 1. The amount of daily intake indicated peaks at intervals of 5 days. 2. The efficiency of assimilation was almost constant for range of temperature and body size, and for each food item adapted in these experiments. However, the efficiency of dissimilation increased with the increase in temperature. 3. An empirical linear equation was established on the relationship between daily feeding rate (R) and daily growth rate (G) at 2-7°C: G=0.3370R-0.225. 4. Body weight and condition factor increased linearly with increase of ration, but body length increased asymptotically. 5. Estimated food requirements of adult walleye pollock was 1.1% of body weight per day.