環境水温とマグロ類・カジキ類の釣獲時体温について

概要

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We measured the rectal temperature of tunas and marlins hauled up the deck by the tuna long line. The results obtained are as follows:-1. The mean value of the body temperature of the live fish was 6°C higher than the temperature of the sea layer where the fish were hooked. 2. The mean value of the body temperature of fish hooked from low temperature fishing-grounds was higher than that of the body temperature of fish hooked from high temperature fishing-grounds. 3. The mean value of the body temperature of fish caught by “deep hooks” was higher than the body temperature of fish caught by shallow hooks". 4. The mean value of the body temperature of large live fish was higher than that of the body temperature of small live fish. 5. The lowest value of the body temperature of live fish is at least 1-2°C higher than the temperature of the sea layer where the fish were hooked. 6. Some dead fish had the highest body temperature next to those of live fish. We can conclude from this investigation that the body temperature of fish when they were caught is the one accumulated in their body, having no immediate connection with the water temperature of the sea layer where they swim.
日本水産學會の論文