Cel 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. Dziedzina nauki agricultural sciencesagriculture, forestry, and fisheriesfisheries Program(-y) FP3-AIR - Specific research and technological development and demonstration programme (EEC) in the field of agriculture and agro-industry, including fisheries, 1990-1994 Temat(-y) 262 - Fishing gear development Zaproszenie do składania wniosków Data not available System finansowania CSC - Cost-sharing contracts Koordynator Scottish Office Agriculture, Environment and Fisheries Department Wkład UE Brak danych Adres Victoria Road AB11 9DB Aberdeen Zjednoczone Królestwo Zobacz na mapie Koszt całkowity Brak danych Uczestnicy (3) Sortuj alfabetycznie Sortuj według wkładu UE Rozwiń wszystko Zwiń wszystko Bundesforschungsanstalt für Fischerei Niemcy Wkład UE Brak danych Adres Palmaille 9 22767 Hamburg Zobacz na mapie Koszt całkowity Brak danych DANISH INST. FOR FISHERIES TECHNOLOGY AND AQUACULTURE Dania Wkład UE Brak danych Adres P.O. BOX 93 9850 HIRTSHALS Zobacz na mapie Koszt całkowity Brak danych INST. OF MARINE RESEARCH Norwegia Wkład UE Brak danych Adres NORDNESPARKEN 2 5024 BERGEN Zobacz na mapie Koszt całkowity Brak danych
