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Variations saisonnières et géographiques des raies dans les captures des chalutiers concarnois: prise par unité d'effort, fréquence et importance des espèces = Seasonal and geographic variations of rays in catches by Concarneautrawlers: catch per unit effort, abundance and importance of the species
Du Buit, M.-H. (1973). Variations saisonnières et géographiques des raies dans les captures des chalutiers concarnois: prise par unité d'effort, fréquence et importance des espèces = Seasonal and geographic variations of rays in catches by Concarneautrawlers: catch per unit effort, abundance and importance of the species. Cah. Biol. Mar. 14(4): 529-545
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
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Keyword
    Marine

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  • Du Buit, M.-H.

Abstract
    The unit of fishing effort which has been chosen is the product of the unfolded motor power (cv) by the duration of valuable fishing (in hr).In the zone exploited by trawlers of Concarneau, that stretches from Scotland to Penmarch Head, the total PUE (catch for unit effort) and ray PUE vary in contrary direction: the 1st increases to the North, the 2nd increases to South. The ponderal composition of ray capture in the different zones shows the importance of 3 spp (R. batis, R. clavata, R. naevus), that constitute 70-80 p 100 of the landed rays.

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