THE EFFECT OF TEMPERATURE ON THE GROWTH AND EFFICIENCY OF YOLK CONVERSION IN THE SALMON EMBRYO

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Abstract
Salmon larvae from one female were placed in a series of 12 temperature chambers ranging from 0.2° to 16 °C., at approximately the time of hatching. The changes in weight of the embryo and yolk sac were followed for some time, and finally brought to a common value representing the embryo gain (or yolk loss) in 10 days. From the results were calculated the temperature coefficient, Q10, for embryo growth, which showed a drop in the colder chambers from about 8 to a little over 2 at 8°, the latter being maintained at warmer temperatures. When the Q10 for activity (yolk loss minus embryo gain) was worked out it proved to follow the same plan as the growth values just mentioned. The effect of temperature on efficiency was also worked out. Efficiency is defined as Efficiency in the cold chambers was found to be low and constant at some 42%. At 5° it began to rise, to reach a maximum of nearly 60% in the warmest chamber.

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