サザエ漁獲礁の効果

DOI 日本農学文献記事索引 Web Site 参考文献17件

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タイトル別名
  • Effect of Artificial Reef for Catch Topshell, Batillus cornutus
  • サザエ ギョカクショウ ノ コウカ

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The purpose of this report was to investigate the effect of artificial reef for catch topshell, Batillus cornutus. The investigation was carried out from 1993 to 1996 for the block with vertical and horizontal (upper and under) grooves which were put into Nomuro fishing ground in the western part of Wakasa Bay in 1991. The density of topshells on the blocks with grooves were 2.7-11.8/m2 that were about 4-16 times higher that of the circumferance ground. The shell height of topshells on the blocks were 19. 3-90. 2mm, and the percentage of catchable size (individuals more than 50mm in shell height) of those shells were 72-80%. The number of topshells in the vertical grooves were more than in the horizontal grooves in day time because the number of topshells in the under horizontal grooves were less than in the vertical and upper horizontal grooves especially. Gelidium elegans was the most dominant algal species on the block, the relationship between the cover of Gelidium elegans and the number of topshell distributed on the block with grooves were positive. Few topshells distributed on the same blocks for long period and most of shells leave from blocks, however, the number of distributed she11s on the block was recovered within comparatively short period. It is concluded from these facts that the block with grooves is the effective artificial reef to catch topshell in the shallower coastal area.

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