통발어구의 어획기구 및 개양에 관한 연구 4. 민꽃게통발의 개량실험

Fishing Mechanism of Pots and their Modification 4. An Experiment for Modifying the Pot for Crab, Charybdis japonica

본 실험에서는 민꽃게 통발의 가장 바람직한 형 및 구조를 확정하기 위해 사구원통형과 사구각주형 통발을 고안하고, 수조실험 및 해상실험을 통해 그들의 민꽃게 유입성능 및 어획성능을 재래의 이구각주형 및 이구원통형 통발과 비교하였다. 그 결과, 수조실험을 통한 유입성능은 사구식에서 좋고 이구식에서 나쁜 경향이었는데, 구체적으로는 이구식의 경우 각주형보다 원통형에서 약간 더 좋았고, 사구식의 경우는 원추형보다 각주형에서 약간 더 좋았다. 해상실험을 통한 어획성능도 전체적으로는 비슷하였는데, 사구원추형이 이구원통형과 어획의 유의차가 없다는 것만이 달랐다. 따라서, 민꽃게 통발의 가장 바람직한 형은 사구각주형이라는 것을 알 수 있었다.

In order to find out the most favorable shape and structure of pot for crab, Charybdis japonica Edwards, the common box type and cylinder type of net pots with two entrances, and the modified cone type and box type of net ones with four were prepared respectively. Then, the ability of the above pots attracting the crab into them and their catches were investigated through tank and field experiments. The attracting ability was higher in pots with four entrances than those with two. In case of two entrance pots, the ability was a little higher in the cylinder type than in the box type. But in four entrance pots, the box type yielded a little higher ability than the cone type. The catches were also arranged by the pots in almost same order with the attracting ability. But, it was only added to the arrangement that the cone type with four entrances had no significant difference of catch with the cylinder type with two entrances. Thus, the most favorable pot for the crab was concluded to be the box type with four entrances.