Abstract
In order to quantify the influence of operation time on catch by coastal set-line fisheries, the present author analyzed catch data obtained from six pairs of set-lines in simultaneous operations in Sagami Bay during 1977-1978. To standardize the fishing effort, the hooking rate per unit immersion time was calculated for each pair of set lines, and this rate was then related to operation time. Results showed a high catch of demersal fish around sunrise. On the contrary, hooking rate in the daytime was obviously lower in each pair due to the increased catch loss by escapement or dislodgement from the hook or by attacks of predators. These results point to a diel variation in the feeding behaviour of demersal fishes, although further detailed studies are needed.
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