FIELD: fishery. SUBSTANCE: ichtioplankton nets are towed behind the trawl in the dispersion area to catch fishes passing through the trawl cells. The nets collect dead fishes and those having lost their defensive responses. The ratio of injured/sound fishes is derived from the net catching ability factor. This factor may vary from zero when all fishes escape alive to 1 when traumatism is 100% . EFFECT: more reliable data on fish traumatism for planning catches. 3 dwg
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RU2171573C2 |
