Growth rate, first reproductive age, life span and total offspring numbers were measured to study the effects of water temperature and salinity on the propagation of rotifer, Brachionus plicatilis. Three types of rotifer, Large (L), Small (S) and Thailand Small (TS)-types, were cultured in the 4×4 factorial culture conditions with four different salinities (5, 15, 25 and 35‰) at each of four different water temperatures (15, 20, 25 and 29℃). The results are as follows ; Under the 4 different salinity gradients (5‰, 15‰, 25‰ and 35‰) at 29℃, the mean growth rates of L, S and TS-type were 0.60, 0.84 and 0.96, respectively. The first reproductive age of three types rotifer appeared to be early at high water temperature. The total offspring numbers of the three types were higher at 25℃ and 29℃, with the maximum value of 28.3 on the average at 29℃ for TS-type, and the minimum value at 15℃ for S-type. Life span decreased with high water temperature and increased with low water temperature. L-type and TS-type rotifer showed the longest life span of 13.5 days on the average at 15℃, and S-type showed shortest 6.2 days on the average at 29℃.
해산어류 종묘생산시 초기단계 먹이생물로서 많이 이용되고 있는 rotifer, Brachionus plicatilis의 large (L)-type, small (S)-type, thailand small (TS)-type에 대한 수온과 염분별 성장율, 최초산란 연령, 수명 및 총산란수 등에 관해 조사한 결과는 다음과 같다. 각 염분 %$(5\%o,\;15\%o,\;25\%o,\;and\;35\%o)$ 에...
