Acronym NA
Category
Fisheries
Title Selection in spinning wad Programme National Programme
Instrument (FP6)
Contact Type (FP7)
Strand (Interreg)
NA
Theme (FP7)
Activity Area (FP6)
Regional Area (Interreg)
Action (COST)
NA
Specific Programme (FP7)
NA
Funding source National Coordinator Olafur A. Ingolfsson Coordinator email Olafur A. Ingolfsson
Coordinator institution
IMR - Institute of Marine Research (Norway)
Institutions involved
NA - Norwegian Directorate of Fisheries (Norway) ,
Start year 2021 End year 2025 Funding (€) € 1,359,587 Website https://www.fhf.no/prosjekter/prosjektbasen/901725/ Summary For a selection device in commercial fishing gear to be appropriate, it is assumed that fish that escape must survive. In order for selection to be as gentle as possible, small fish should escape at fishing depths. Surface selection is undesirable as it reduces the survival probability of sorted fish compared to sorting at the fish depth. Ingólfsson et al. (2021) showed that 50% of the undersized haddock that were in the bag/extension when the spinning water came to the surface were selected out here. The surface selection was often decisive for the inclusion of undersized haddock in the catch to fall below the upper permissible limit of 15% in number. Good knowledge of how bag design affects the gear's selective properties is therefore essential to reduce the problems with catching undersized haddock and extensive surface selection. In order for the Norwegian Institute of Marine Research to be able to give advice to the administrative authorities regarding selection devices, the effect of the changes at stock level must be evaluated. In this connection, it will be important to model the effect of changes in selection patterns on stock development of haddock in the Barents Sea. A final answer to a perfect selection pattern using population models is considered an unrealistic goal. It is nevertheless realistic to propose an estimate for an "" ideal "" taxation pattern. Modelling can also evaluate the effect of changes in selection on population development.
Main objective:
To estimate size selection for haddock in spinner fishing and design a spinner bag / selection device that sorts out haddock below the minimum size so that the selection takes place to the greatest possible extent at the fishing depth.
Sub-goals:
• To develop a methodology to be able to quantify what proportion of the selection takes place respectively at the bottom and at the sea surface.
• To estimate selection on the bottom and at the sea surface for spinnerets of different dimensions (length and girth).
• To develop a new spinning wad bag concept, possibly an alternative selection device, so that selection takes place to the greatest extent possible at the fishing depth.
Keywords
Gear technology;
Haddock;
Fishing technology;
Fish;
Gear selectivity;
Marine Region
42
Barents Sea (27.I)
1
Marine Region Map
