【摘要】 本文报道了S‰,NH₃-N,pH及O₂对魁蚶幼虫、稚贝及成体影响的初步研究结果,求得魁蚶幼虫、稚贝及成体对S‰,NH₃-N,pH和O₂的适应浓度范围和最适范围。结果表明:魁蚶随年龄的增长,对S‰的适应能力逐渐减弱;对NH₃-N,pH及O₂的适应能力则逐渐增强。更多还原

【Abstract】 The effects of S(‰), NH3-N, pH and dissolved oxygen on the larvae and adults of the Scapharca broughtanii were studied. The survival rate of the larvae is more than 93(%) in the salinities 21.50-39.60(‰) within 24h exposure. For 1-3 year-old groups the medium lethal time in the same salinities reduces along with the increase of the ages. The NH3-N concentration for larvae TL50 is 366±66 ppb. The medium lethal time increases with age for 1 to 3 year-old groups in same TL50 of NHs-N. More than 95(%) larvae survived in pH 7.5-8.5 within24h. However, beyond the range of these pH values the mortality of the larvae increases. As pH value is 6.0 or 9.0, the TL50 increases with the age for 1-3 year-old groups, the dissolved oxygen in 24 h and TL50 is 0.21 mg/L. Both adult and larvae can endure the low dissolved oxygen. The relationship between the attachment, metamorphosis and S(‰), NH3-N and pH have been studied also.更多还原