The effect of cover mesh size and cod-end catch size on cod-end selectivity
In: Fisheries Research. Elsevier: Amsterdam. ISSN 0165-7836; e-ISSN 1872-6763, more
|  |
| Keyword |
|
| Author keywords |
Selectivity; Catch size; Cover mesh size |
| Authors | | Top |
- O'Neill, F.G.
- Kynoch, R.J.
|
|
|
| Abstract |
Selectivity trials were carried out to examine the effect of catch size on selectivity and to test whether an increase of the cover mesh size would have any impact on the selection parameters of the cod-end fished. There was a significant increase of the 50% retention length for both haddock and whiting over the range of catch weights considered which was from 113–407 kg. It is suggested that this tendency will not continue and that with increasing catch size the l50 will begin to level out or decrease. This explanation is consistent with the work of other authors, where catches are generally much larger. The increase of cover mesh size from 40 mm to 60 mm had no effect on the selection parameters of the 100 mm cod-end tested. |
|
