四种海产经济鱼类精子的生理特性和环境因子的关系

RELATIONSHIP BETWEEN ENVIRONMENTAL FACTORS AND PHYSIOLOGICAL CHARACTERISTICS OF FOUR COMMERCIAL SEAWATER FISH SPERMATOZOA

The spermatozoal physiological characteristrics of four species of seawater fish, sea bass (Lateolabrax japonicus), black porgy (Sparus macrocephalus),mudskipper (Boleophthalmus pectirostris) and red sea bream (Pagrosomus major), were investigated. Both the spermatozoa survival rate and swimming time were taken as criterions to evaluate the effects of various salinities and pH on the spermatozoa. The results indicated that different salinities and pH affected chiefly the swimming time of the four species of fish spermatozoa. The most suitable salinities for the mudskipper ranged from 15 to 20 for the sea bass, about 20 for the black porgy, about 25 for the red sea bream, about 30. The most appropriate pH for the sea bass, black porgy and red sea bream was about 8.0, but for the mudskipper was 6.02 8.01. Under the appropriate enviromental conditions, the swimming time of the sea bass, black porgy and red sea bream spermatozoa lasted 20 minutes, while the mudskipper ones lasted from 80 to 90 minutes.