サザエ漁獲礁の効果  [in Japanese] Effect of Artificial Reef for Catch Topshell, Batillus cornutus  [in Japanese]

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Abstract

著者らは、波浪の穏やかな内湾域に長径30~80cmの転石をもちいて造成した投石礁が、殻高8mmのサザエ稚貝から京都府で漁獲可能なサイズである殻高50mm以上(殻蓋径20mm以上)の成貝(以下魚礁サイズ)まで保護育成するために有効であることを示した。投石礁は転石を積み重ねることによりサザエのすみ場を創出し、その分布密度を高めるが、夜行性であるサザエは、そのような場所では昼間転石の陰に隠れる個体が多くなる。京都府では、サザエは主として船上から「箱メガネ」と「さざえやす」を用いる水視漁法によって漁獲されており、同漁法は昼間に操業される。したがって、水視漁法では投石礁でサザエを効率良く漁獲できないことも明らかとなった。そこで、投石礁と同様に漁獲サイズのサザエが高密度に分布し、水視漁法では漁獲しにくい昼間においても容易に漁獲が可能な増殖礁を考案する必要が生じた。そのため、サザエが岩礁域の溝などに集中分析することを参考にして、既成の異型ブロックへ上方に開いた溝を付けた実験礁が作製され、サザエ漁場である外海域に面した海域に設置された。

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 higherthat 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 becausethe 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 ofGelidium 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 concludedfrom these facts that the block with grooves is the effective artificial reef to catch topshell in the shallower coastalarea.

Journal

  • Journal of Fisheries Engineering

    Journal of Fisheries Engineering 35(2), 145-152, 1998-12-01

    The Japanese Society of Fisheries Engineering

References:  17

Codes

  • NII Article ID (NAID)
    10008274907
  • NII NACSIS-CAT ID (NCID)
    AN10278554
  • Text Lang
    JPN
  • Article Type
    NOT
  • ISSN
    09167617
  • NDL Article ID
    971439
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-1327
  • Data Source
    CJP  NDL  J-STAGE  JASI 
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