短報
異なる餌密度で飼育したアユ仔魚の初期生残率
2019 年 67 巻 3 号 p. 285-287
詳細
2019 年 67 巻 3 号 p. 285-287
Survival rates of Ayu larvae reared at conditions of several different food densities in a tank for 15 days were studied. The study showed mean larval survival rates of 41-51, 53-57 and 5-6 percent for the larvae respectively fed on 10.0, 1.0 and 0.1 rotifers per milliliter. The survival rate of larvae being fed on 0.1 rotifers / ml was significantly lower than the others. These results suggest an unfavorable influence in the number of Ayu juveniles migrating back to rivers when food quantity in the brackish water area near the coast falls near to 0.1 zooplankton per milliliter level.
