Quantification of species selectivity by using separating devices at different locations in two whitefish demersal trawls
This paper presents a quantitative approach to the study of fish behaviour in trawls with the aim of maintaining the catching efficiency of target species and reducing discards of unwanted bycatch. Differences in vertical distributions of species during passage through a trawl are used to sort the c...
| Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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| Main Authors: | , , , , |
| Other Authors: | |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Canadian Science Publishing
2009
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1139/f09-145 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F09-145 http://www.nrcresearchpress.com/doi/pdf/10.1139/F09-145 |
| Summary: | This paper presents a quantitative approach to the study of fish behaviour in trawls with the aim of maintaining the catching efficiency of target species and reducing discards of unwanted bycatch. Differences in vertical distributions of species during passage through a trawl are used to sort the catch into separate compartments prior to size selection. It is demonstrated that behavioural differences may be utilized in separating species prior to size selection. Comparisons indicate that these patterns are consistent over replicate trials. Unlike cod (Gadus morhua), haddock (Melanogrammus aeglefinus), saithe (Pollachius virens), and whiting (Merlangius merlangus) do not change their vertical preference longitudinally in the trawl. |
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