Zoeken
Zoeken kan via de modus 'eenvoudig zoeken' (één veld) of uitgebreid via 'geavanceerd zoeken' (meerdere velden). Zo kan je bv. zoeken op een combinatie van een auteursnaam (auteur), een jaartal (jaar) en een documenttype.
Boekenmand
Nuttige resultaten kan je aanvinken en toevoegen aan een mandje. De inhoud hiervan kan je exporteren of afdrukken (naar bv. PDF).
RSS
Op de hoogte blijven van nieuw toegevoegde publicaties binnen uw interessegebied? Dit kan door een RSS-feed (?) te maken van jouw zoekopdracht.
nieuwe zoekopdracht
A comparison of three indices of fishing power on some demersal fisheries of the North Sea
Marchal, P.; Ulrich, C.; Korsbrekke, K.; Pastoors, M.A.; Rackham, B. (2002). A comparison of three indices of fishing power on some demersal fisheries of the North Sea. ICES J. Mar. Sci./J. Cons. int. Explor. Mer 59(3): 604-623
In: ICES Journal of Marine Science. Academic Press: London. ISSN 1054-3139; e-ISSN 1095-9289
|   |
| Trefwoorden |
ANE, North Sea
British Isles
Catchability
Data > Fishery data > Fishing power
Fisheries > Demersal fisheries
Horsepower
Horsepower
Horsepower
Netherlands
Norway
Temporal variations > Periodic variations > Annual variations
British Isles [Marine Regions]; Nederland [Marine Regions]; Noordzee [Marine Regions]; Norway [Marine Regions]
Marien/Kust |
| Auteurs | | Top |
- Marchal, P., correspondent
- Ulrich, C.
- Korsbrekke, K.
|
- Pastoors, M.A.
- Rackham, B.
|
|
| Abstract |
The scope of this study is to identify temporal dynamics in fishing power, by deriving three different indices (IFP1, IFP2, IFP3) based on three independent methods. IFP1 is derived from the GLM analysis of the relationship between fishing mortality and fishing effort, assuming that total fishing mortality estimates from XSA (eXtended Survivors Analysis) are accurate. IFP2 is derived from the GLM analysis of the difference between the Log-CPUE of a vessel and the average Log-CPUE of a set of reference vessels, which are chosen with regards to the stability of their Log-CPUE over time. IFP3 is derived from the GLM analysis of the Log-CPUE of a vessel relative to some external survey abundance index. Particular attention is paid to the horsepower and year effects in IFP1, IFP2, and IFP3. This methodology is applied to the Danish, Dutch, English and Norwegian demersal fisheries of the North Sea. The fishing power estimated by all indices increases with horsepower, particularly in relation to target species. Despite less consensus in the estimation of annual variations in fishing power, some important features are highlighted. First, there are cases where fishing power has consistently increased over the period of investigation, possibly through an overall increase in fishing efficiency. Second, there are examples where fishing power has increased relative to one species, and remained constant or even decreased in relation to another one. In the context of mixed-species fisheries, this feature might reveal a shift in fishing tactics. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
