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Effective use of fishing lights for jigging of large-sized Ommastrephes bartramii
Watanabe, T.; Inada, H. (1998). Effective use of fishing lights for jigging of large-sized Ommastrephes bartramii, in: Okutani, T. Contributed papers to International Symposium on Large Pelagic Squids, July 18-19, 1996, for JAMARC's 25th anniversary of its foundation. pp. 77-87
In: Okutani, T. (1998). Contributed papers to International Symposium on Large Pelagic Squids, July 18-19, 1996, for JAMARC's 25th anniversary of its foundation. Japan Marine Fishery Resources Research Center: Tokyo. 269 pp., more
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Keyword
    Marine/Coastal
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  • Watanabe, T.
  • Inada, H.
Abstract
    To elucidate the rnechanisrn of attracting large-sized neon-flying squid (>30 cm mantle length) , Ommastrephes bartramii, efficiently to fishing lights, the retinal adaptation of squds jigged under fishing lights was investigated in the North Pacific Ocean. The squids were caught at different depths under onboard fishing lights in the nighttime and attracted with underwater fishing lights in the daytime. Their retinal adaptation immediately after being caught was always dark adapted in the daytime and regardless of depths in the nighttime. The squids were jigged at depths of greater than 100 m in the nighttime and greater than 230m in the daytime by the jigging machines during this operation. In contrast the squid had been caught by driftnets with a depth of 7 to 10 m in the nighttime. Therefore the present fishing light power of about 300 kW is excessive and the strong power of these lights increase the depth of capture.
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