摘要
在实验室条件下,研究了酸性水和投加铝、钙对鲢鱼胚胎孵化和鱼苗存活以及幼鱼鳃超微结构的影响。pH4.0引起所有胚胎在24小时内死亡,暴露于pH4.5—6.0的胚胎孵化率和暴露于pH4.0—6.0的5—15日龄鱼苗存活率随pH值上升而增高。投加0.5mg Al^(3+)/L使在酸性pH暴露条件下的胚胎孵化率和鱼苗存活率进一步降低。投加3.0mg Ca^(2+)/L可显著提高暴露于pH4.5和5.0的胚胎孵化率;投加2.0mg Ca^(2+)/L可在一定程度上提高暴露于pH4.5和5.0的鱼苗存活率。幼苗经pH4.5暴露8小时后出现严重的鳃超微结构损害;投加1.0mg Al^(3+)/L使鳃结构损害加剧;投加5.0mg Ca^(2+)/L可明显缓解酸性水对鳃的损害。
The effects of acidic water with addition of Al and Ca on the embryo hatchability, fry survival and juvenile gill ultrastructure of silver carp (Hypophthalmichthys molitrix)were studied under laboratory conditions. All eggs were died at pH 4.0 within 24 hours. The increase in pH value was accompanied by a progressive increase in the hatchability of embryo exposed to pH 4.5—6.0 and in the survival of fry with age in day from 5 to 15 exposed to pH 4.0—6.0. The addition of 0.5mg Al^(3+)/L not only further reduced the hatching of embryo, but also caused decrease in the survival of fry under acidic pH. The addition of 3.0mg Ca^(2+)/L significantly increased the hatching of embryo under pH 4.5 and 5.0. The added 2.0mg Ca^(2+)/L increased the survival of fry to a certain extent at pH 4.5, especially at pH 5.0. The exposure to pH 4.5 for 8 hours resulted in a severe damage of gill ultrastructure of juvenile; The addition of 1.0mg Al^(3+)/L to pH 4.5 water enhanced the syndrome; 5.0mg Ca^(2+)/L added obviously mitigated the gill damage by acidic water.
出处
《应用生态学报》
CAS
CSCD
1992年第1期69-75,共7页
Chinese Journal of Applied Ecology
基金
国家自然科学基金
关键词
酸性水
铝
钙
鲢鱼
早期发育
鳃
Acidic water, Aluminium, Calcium, Silver carp, Early development, Fish gill ultrastructure.
