河蟹幼体的耗氧量及其窒息临界点和半致死点

THE OXYGEN CONSUMPTION、THE STIFLING CRITICAL POINT AND THE HALF——LETHAL POINT OF THE CRABLARVA

本文报道了不同个体大小及发育阶段的河蟹幼体的耗氧情况，并对其窒息临界溶氧点和半致死溶氧点进行了探讨。结果显示；不同个体大小及发育阶段的河蟹幼体的耗氧量在最初两小时内没有明显的差别，而到窒息临界点时的耗氧量是随着河蟹幼体个体重量的增大而减少，但处于变态期的河蟹幼体的耗氧量明显高于未变态或已变态的河蟹幼体；河蟹幼体的窒息临界溶氧值是随着个体重量的增大而减小；河蟹幼体的半致死溶氧值是在1．4～1．8mg／L之间波动，基本上与个体大小无关。

This paper reports the oxygen consumption、the stifling critical dissolved oxygen point and the half-lethal dissolved oxygen point of different sizes of crablarvas and in different development stages.The result shows that ① in the first two hours the oxygen consumption of the larvas tends to the same, but while the larger the individual crablarva grows, the smaller the stifling critical point of oxygen consumption would be however the oxygen consumption of the metamorphosing larvas is larger than that of the unmetamorphic larvas;② the smaller the stifling critical dissolved oxygen value is, the larger the individual crablarva grows;③in different sizes of crablarvas, the half-lethal dissolved oxygen value is from 1.4 to 1.8 mg/L, and bears no relation ship with the size.