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Gill net selectivty
(Central Institude of Fisheries Technology, 2002) Thomas, S.N.
Selectivity is an important tool for effective management of fisheries. It is defined as the ability to target and capture fish by species, size or sex or a combination of these during harvesting operation, allowing all incidental by catch to be released unharmed. By regulating the minimum mesh size of a fishing fleet, the minimum landing size of the target species can be determined. Several researchers stress the importance of selecting the optimum mesh size from the standpoint of conservation of population.
Gill nets and their operation
(Central Institute of Fisheries Technology, 2002) Thomas, S.N.
Gill net is a highly selective and passive gear accounting for 20% of all the fishing methods of the world. The simplicity of its design, construction, operation and its low energy requirement make the gear very popular in all the sectors especially in the traditional sector. It is a highly selective gear and the use of this gear in a responsible way ensures resource conservation.
Marine biodeterioration
(Central Institute of Fisheries Technology, 2002) Thomas, S.N.
Biodeterioration or biodegradation of materials can be defined as any undesirable change in the properties of a material caused by the vital activities of biological agencies organisms.