Objectif There is unexplained variance in selectivity data. It is necessary to determine how much of this variance is due to variables which can be controlled and possibly used to improve selectivity by legislation and how much is due to variables outside human control or due to random effects. Four aspects of whitefish trawl selectivity will be studied during this project. The effect of twine diameter on selectivity will be quantified to provide information to legislate against the use of thick twine if necessary. The effect of gear size and towing speed will be studied to determine the extent to which selectivity can be manipulated by increasing vessel horse power. Catch size may be a significant factor in unexplained variance between hauls and between cruises. Finally fish shape is known to change significantly during the year, eg pre- and post-spawning and this effect will be quantified. Consistent data sets will be collected on all these topics. The information may be used to improve the effectiveness of technical measures, to define more precisely the selectivity characteristics of EC fishing fleetsand to identify the range of uncertainty in these characteristics for a given fishing situation, thus benefitting the management and control of EC whitefish fisheries and leading to more effective exploitation of the stocks. Champ scientifique agricultural sciencesagriculture, forestry, and fisheriesfisheries Programme(s) FP3-AIR - Specific research and technological development and demonstration programme (EEC) in the field of agriculture and agro-industry, including fisheries, 1990-1994 Thème(s) 262 - Fishing gear development Appel à propositions Data not available Régime de financement CSC - Cost-sharing contracts Coordinateur Scottish Office Agriculture, Environment and Fisheries Department Contribution de l’UE Aucune donnée Adresse Victoria Road AB11 9DB Aberdeen Royaume-Uni Voir sur la carte Coût total Aucune donnée Participants (3) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire Bundesforschungsanstalt für Fischerei Allemagne Contribution de l’UE Aucune donnée Adresse Palmaille 9 22767 Hamburg Voir sur la carte Coût total Aucune donnée DANISH INST. FOR FISHERIES TECHNOLOGY AND AQUACULTURE Danemark Contribution de l’UE Aucune donnée Adresse P.O. BOX 93 9850 HIRTSHALS Voir sur la carte Coût total Aucune donnée INST. OF MARINE RESEARCH Norvège Contribution de l’UE Aucune donnée Adresse NORDNESPARKEN 2 5024 BERGEN Voir sur la carte Coût total Aucune donnée