Behavior of puffer Lagosephalus and the fishing mechanism of the pot trap

The purpose of this paper is to consider the fishing mechanism of the pot trap. Fish behavior was observed in and around the trap using underwater CCD cameras in the sea and in an experimental tank. Two types of underwater observation were conducted at the fishing ground and open air experimental ta...

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Published inFisheries science Vol. 65; no. 3; pp. 419 - 426
Main Authors Hirayama, Mamoru, Fuwa, Shigeru, Ishizaki, Munechika, Imai, Takehiko
Format Journal Article
LanguageJapanese
Published 01.01.1999
Subjects
Lagocephalus
Marine
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Summary:The purpose of this paper is to consider the fishing mechanism of the pot trap. Fish behavior was observed in and around the trap using underwater CCD cameras in the sea and in an experimental tank. Two types of underwater observation were conducted at the fishing ground and open air experimental tank. Total of observation time was 3240 minutes in field experiments and 1440 minutes in experimental tank. Authors examined the puffer Lagosephalus behavior in experiments and considered the fishing mechanism of the pot trap. The results showed that the catching ratio was 2%. The posture of fish in the trap entrance were different between those escaped and those caught. The snout was always pointed downward in the escaped, while in captured fish, the snout direction changed upward rapidly. It was determined that a fish was captured when about a half of the body passed through the trap entrance.
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ISSN:0919-9268