engleski

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Experimental catches of trammel bottom sets with standard construction caracteristics were analysed. Fishing operation were performed exclusively at night. Nets were set at the bottom between 2 and 30 m depth. All the data on the catch quantities were expressed per standard net (CPUE, catch per unit efort). Changes in target communities were manifested as: (i) decline in catches per unit wffort - CPUE ; (ii) increase, on the one hand, in the CPUE of fish family Scorpaenidae as well as fish species Scorpaena porcus and Symphodus tinca and crustacean Maja crispata, and on the other hand CPUE decline of fish family Labridae and Serranidae as well as fishes Mullus spp. and cephalopod species Octopus vulgaris ; (iii) changes in the length frequency distribution of dominant species in the catches, that is Scorpaena porcus, Symphodus tinca and Mullus surmuletus. The changes are primarily due to intensive fishing activities which tin the populations and effect interspecific and intraspecific relations in them.

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