マグロ延繩における釣鈎水深の実測値と計算値との比較
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概要
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Assuming that a set of longline gear takes a form of a catenary in sea water, we can obtain depth of any hook attached to the line by calculation. On the other hand the actual depth of such a hook can be surveyed by means of a chemical tube as is often done at time of experiments. Author studied on comparison of values obtained from both methods and have obtained the following results: 1) While there happened difference between the calculated catenary value and the actual survey value, dispersion of the differences was almost constant at a given depth of water, and it changed as the depth of water changes. 2) Cases when survey value shows smaller than catenary value were more frequent than cases when survey value shows larger than catenary value. 3) It is presumed that cases when survey value shows larger than catenary value happen from that the distance between neighbouring flagpole of the longline became short or, in other words, the slackness of longline became large. 4) It was reported by Hamuro that cases when survey value shows smaller than catenary value happen when hook has been hurled upward by sea current. These cases were more frequent when angle making by way to set line and it of sea current is included angle. 5) Mean value of difference between catenary value and survey value was extremely smaller than value of difference of seasonal change of swimming layer of tuna and marlin. Consequently it is presumed that dependability of the calculated catenary value is not always so small in study of seasonal change of the fishes'swimming layer.
- 社団法人 日本水産学会の論文
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