|A bottom trawl is a cone-shaped net, which is towed in contact with the seabed. It consists of a body ending in a codend, which retains the catch.|
|These are trawlers on which the fish is preserved by freezing.
|Species EnvironmentConsidering that knowledge of behaviour and understanding of the animals' reaction to fishing gear is an essential condition to improve the efficiency of fishing gear, observations and research have been carried out in various parts of the world. Some of the results concerning the reaction of squid to trawls in temperate waters are given below: Herding response of squid to trawls has been observed in the NW Atlantic. Swimming speed: no information on maximum speed. Endurance: in general, considered as very limited; however observed: at least 5 minutes at 3 knots; they would therefore be able to swim faster and longer than predicted. Rising behaviour: when squid see the net they start swimming along with the net rising slowly towards the top part of the net: as they school squid rise toward the top of the net. Normally squid appear to be distributed at the top and in the upper part of the sides of the net (it is therefore possible raising the bottom part of the net). As already mentioned, the best catches are obtained in daytime when the squid aggregate near the seabed.Fishing GearVarious models of trawl are widely used for squid by both large and medium-size trawlers. In Morocco, the traditional type or long wing flat (Spanish type) small to medium size bottom trawl (two seams) are used. In offshore waters, larger vessels use large high opening bottom trawls (four seams, Korean type) for catching octopus. In Australia squid are a by-catch of the prawn trawling activities.|