Behaviour of Norwegian spring spawning herring in relation to underwater light
Original version
This report is not to be cited without prior reference to the authorsAbstract
The Norwegian coastal purse seiners, with shallow nets, have
experienced difficulties in catching the herring due to their
natura! behaviour being located too deep during day time and
toe scattered during night time. Experiments, conducted by
FTFI, have shown that scattered congregations of herring may
be concentrated by underwater light. When light was switched
on underneath the school, the herring immediately rose
towards the surface with a speed of approximately 20 m/min.
Use of underwater light to manipulate the natural behaviour
of herring would increase the efficiency, and consequently the
economic benefit for the costal purse seiners.