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Impact of technological creep on fishing effort and fishing mortality, for a selection of European fleets ArchiMer
Marchal, Paul; Andersen, Bo; Caillart, B.; Eigaard, Ole; Guyader, Olivier; Hovgaard, Holger; Iriondo, Ane; Le Fur, Fanny; Sacchi, Jacques; Santurtun, Marina.
Face-to-face interviews were conducted to identify the main changes in gear and vessel technology that may have improved the fishing efficiency of a number of French, Danish, and Basque fleets over the past few decades. Important changes include the gradual appearance of twin trawls (Danish and French trawlers) and trammel-nets (French gillnetters), and the increased polyvalence of Basque bottom trawlers. The results suggest that fishing effort descriptors that are not traditionally measured (gear type, groundrope type, length of net used per day, headline length, crew size, number of winch or net drums) may have a substantial impact on catch rates. Adjusting fishing effort using such descriptors may generally improve the relationship between fishing...
Tipo: Text Palavras-chave: Twin trawls; Technological creep; Groundrope; Generalized linear models; Fishing mortality; Fishing effort; Catch rate.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2611.pdf
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Mesures sur chaluts jumeaux au bassin d'essai de pêche de Lorient ArchiMer
Meillat, Marc.
These basin tests follow up the campaign done on board the n/o GWEN-DREZ from 12 November to 6 December 1985 with the goal of observing the respective behaviours of the twin trawls and the single trawl of the same type. The mock-ups created for the basin are derived from 23.90 metre shrimp trawls assembled by LE DREZEN Company following an IFREMER plan for COTONEC Company in Guyana.
Tipo: Text Palavras-chave: Model; Flume tank; Twin trawls; Fising technology; Maquette; Technologie des pêches; Bassin d'essai; Chaluts jumeaux.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/rapport-2668.pdf
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Mission ORHAGO1, Mise au point d'un gréement de chaluts jumeaux pour les campagnes halieutiques ORHAGO ArchiMer
Vacherot, Jean-philippe; Bavouzet, Gerard.
The new ORHAGO campaigns, which aim to form a multi-year series of biological and ecological data, are relying on the use of twin trawls associated with a new type of rigging. The ORHAGO1 campaign should make it possible to make adjustments of the diverse elements of the fishing train in order to obtain an optimal configuration. This preliminary adjustment is indispensable for obtaining reliable data during ORHAGO campaigns. In order to do this, twin trawls of 25.15 metres, belonging to TMSI, were used jointly with the ship's panels (Morgère WS) and a clump specially developed for the occasion with the Morgère Company. In order to verify the correct behaviour of the device, the Scanmar setup monitoring system as well as Micrel tension and inclinometric...
Tipo: Text Palavras-chave: Clump; Trawl doors; Trawl survey; Twin trawls; Fishing technology; Clump; Panneaux; Campagne de chalutage; Chaluts jumeaux; Technologie des pêches.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/rapport-2651.pdf
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