MORTALITY OF THE COD EGG IN RELATION TO TEMPERATURE

Open Access
Publisher Website
Google Scholar
Abstract
Cod eggs obtained by artificial spawning and fertilization were distributed among beakers in 4 tanks maintained at different constant temps. 16 to 12[degree] C). Their development was followed, and those dying each day were removed and counted. The number of eggs dying in a 24-hour period was figured as the percentage of the eggs alive at the beginning of that period. This percentage daily mortality was correlated with the stage of development and it was found that there was a decrease in mortality coincident with the closing of the blastopore followed by a low mortality period until the embryo was 3/4 the diam. of the egg membranes, after which mortality increased steadily up to hatching. The hatching period is discussed with reference to its use as a stage of development.

This publication has 1 reference indexed in Scilit: