摘要
1986—1990年,于黑龙江省绥芬河,先后观察了173组滩头雅罗鱼受精卵在不同水温下的发育情况,查明了该鱼胚胎发育的最适水温为10—18℃,极限水温为7—27℃,与同时期绥芬河水温变化相一致,各发育期胚胎对水温变化的敏感性不同。孵出期和囊胚原肠期发育速率变化较大,积温为变数,其它时期发育积温趋于常数。使胚胎停止发育的下限温度与致死温度明显不同。各时期胚胎停止发育的下限温度为:孵出期为9℃,囊胚原肠期为8.5℃,卵裂期、器官分化期为6.5℃。胚胎停止发育是适应气候多变的一种自然选择。
The effect of water temperature change on the rate of embryos and alevin development and the upper and lower limits of lethal temperature for hatching have been defined for dace (Leuciscus brandti) stocks. Incubation temperatures of 10℃ and 18℃ produced the best survival rates of eggs and alevins for dace stocks. The embryos stood with a temperature between 7℃ and 27℃, nearly 100% mortality occurred at 27℃ or higher and below 7℃. Effect of temperature on embryos was distinct at different development stages, and the lower temperatures harmed easily to neural plate and early alevins. At 7℃, the embryos of neural plate stages had nearly 100% mortality and early alevin had about 90% mortality. A temperature over 19℃ harmed easily to organogenesis and hatching stages. The relationship between temperature and hatching duration was non-linear: Y = 3587.29X-1.300.The centigrade units of hatching was not constant. The changing range of the centigrade units was different at each of development stages of embryos. In hatching and blastula-gastrula stages, centigrade units change greatly. At a lower temperature, the embryos development stopped, and the 'dormancy temperature' of embryos was different at each of development stages, for example, the hatching stage was at 9℃, the blastula-gastrula stage was at 8.5℃ and the cleavage and organogenesis stages were at 6.5℃.
出处
《生态学报》
CAS
CSCD
北大核心
1992年第3期232-238,共7页
Acta Ecologica Sinica
关键词
滩头雅罗鱼
胚胎发育
水温
dace (Leuciscus brandti), embryos development, temperature change.
