摘要
本文主要探讨了几种环境因素(温度、盐度、pH值、密度、化肥施用量及藻类)对缢蛏受精卵孵化率的影响。研究结果表明:受精卵孵化最佳条件为:温度20—25℃;pH值为7.0—8.5;适盐范围随亲蛏来源不同而异,来自低盐区的,最适盐度8—12‰,而来自高盐区的,15—30‰,温度可影响其适盐范围,25℃左右,其范围最广;受精卵的密度以50粒/毫升以下为宜;保持低浓度的藻类对其孵化有利;施用2ppm以下的硫酸铵和尿素,可促进藻类繁殖,对受精卵孵化的影响不大。
The effects of temperature, salinity, pH, egg density, chemical fertilizer and phytoplankton on the hatching rate of eggs of Sinonovacula constricta have been studied. It is found that the suitable temperature is in the range of 20-25℃ and pH7.0-8.5. The suitable salinity varies with diffrent sources of razor clam; optimum salinity is in the range of 8-12% for low salinity areas and 15-30% for high salinity areas. Temperature has effect on the range of suitable salinity and the range at 25℃ is the widest.The suitable density of eggs is lower than 50 Ind·ml-1. The presence of phytoplankton at lower density was advantagious to the hatching of eggs. Ammonium sulphate and urea at concentrations lower than 2ppm enhance phytoplankton growth and their effects on hatching rate are not obvious.
出处
《生态学报》
CAS
CSCD
北大核心
1989年第4期310-314,共5页
Acta Ecologica Sinica
关键词
缢蛏
孵化率
盐度
温度
Sinonovgculq con strict a, the hatching rate of eggs.
