Dødelighet av sild etter trenging i not : Mortality of herring after being crowded in a purse seine

Abstract

When purse seining for herring, catch regulation have traditionally been done by discarding all or part of the catch if it is too big, or if the size or quality of the herring does not match requirements. Net burst is also quite common. Experiments have shown that mackerel do not tolerate much crowding before mortality rates become unacceptably high. It has been speculated that this may also be the case for herring.