Abstract
It has been known1) ?? 3) that the lobster has a crepuscular type of daily activity with two peaks in catch. But the mechanism for the bimodality of the activity is yet unknown. In the present investigation, catch experiments and measurements of under water light intensity in the fishing ground of the lobster were carried out simultaneously, and an analysis was made with regard to the relationship between the activity and the light intensity. The results of the experiments are given in Table 3, and Fig. 2. Basing upon the results obtained from the present experiments, it may be said that the mechanism in question is as follows: sudden changes of the under water light intensity in dawn or dusk give stimulus for activity of the lobster, and consequently increase the catch of the lobster (Fig. 2). Under water light intensity ranges 2.4-3.5×10-4 and 2.2-2.8 × 10-4μW/cm2 in full moon night (moon-age 15) and new moon night (moon-age 4.3) respectively.
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