Retinomotor Response and Retinal Adaptation of Japanese Common Squid Todarodes pacificus at Capture with Jigs

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  • Inada Hiroshi
    Laboratory of Fishing Science and Technology, Tokyo University of Fisheries

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タイトル別名
  • Retinomotor Response and Retinal Adaptation of Japanese Common Squid <i>Todarodes pacificus</i> at Capture with Jigs
  • Retinomotor Response and Retinal Adapta

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The power of fishing lights has increased in Japanese squid jigging boats due to vessel competition rather than a proper understanding of the physiology and behavior of the target species. The movement of the black pigment in the outer segment of squid retina is related to exposure time and light intensity. Using the retinomotor response as an index of their retinal adaptation to the light, tank experiments and jigging operations were conducted to examine the relationship between fishing light intensity, the jigging layer depth and time of capture of Japanese common squid Todarodes pacificus. The tank experiments revealed that the retinal adaptation is not correlated with exposure time and intensity, because the iris functions to shield their retina from the rapid increase of light level.The results of jigging operations, however, indicated that their retinal adaptation is correlated with their diel vertical migration. It is suggested that, under the powerful lighting boats, the squid find and seize jigs in the low illuminance area in which the squid can adjust their vision reasonably depending on their retinal adaptation state. On basis of these results, the proper use of fishing lights for squid jigging is discussed.

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