スケトウダラの筋収縮時間〔英文〕

概要

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The muscle twitch contraction time of Walleye pollock Theragra chalcogramma was measured in relation to fish size and muscle temperature, on board a Northern trawler in the Okhotsk Sea. The contraction time was defined as the time period from the electric pulse of 2ms wide and 5-20V, to the peak of muscle twitch contraction. The scale effect was observed as the muscle con-traction increased from 60-80ms for fish 20-30cm long, to 90-120ms for fish 40-50cm long, at the water temperature of 2°C. According to the results, the maximum swimming speed of the fish was estimated as 1.0-1.6m/s, which was much lower than the towing speed of the trawl net. When muscle temperature was elevated, the contraction time was shortened. It implies that more chances are given, at higher temperature, for fish to escape from the net due to the higher swim-ming speed.
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