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• W2146054707 abstract "a b s t r a c t The use of different trawl nets is a factor to be considered when analysing historical swept-area research surveys aimed to characterize temporal variations in the relative abundance of demersal resources. If factors that may affect the performance of the bottom trawls were considered, more reliable temporal trends could be established. Due to the high species diversity that characterizes tropical areas, this kind of analysis is often carried out at the multispecies level. Therefore, the objective of this study was to establish the effect of two technical factors, mesh size and towing speed on the multispecies catch rates obtained in different demersal surveys carried out in the Colombian Caribbean Sea between 1988 and 2001, using two generalized linear models: one covering the entire study area and another restricted to one eco-region. For the global model, the effect of the mesh size on the multispecies catch rates was marginally significant (p 0.10). In contrast, for the eco- region model, the effect of mesh size was not significant (p > 0.10), while towing speed had a significant effect (p < 0.05). Size structure analysis showed escapement mainly through the codend meshes for the larger mesh size evaluated (50.8 mm), confirming the appropriateness of considering mesh size when analyzing historical data of swept area surveys. The effect of the towing speed, beyond the clear incidence on the area actually swept, point to the complexity of the relationship between speed and catch rates. In brief, the results showed that, when assessing historical databases, indices of relative abundance of tropical demersal resources can be improved by including mesh size and towing speed factors." @default.
• W2146054707 created "2016-06-24" @default.
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• W2146054707 date "2015-04-01" @default.
• W2146054707 modified "2023-09-24" @default.
• W2146054707 title "Effects of mesh size and towing speed on the multispecies catch rates of historical swept area surveys" @default.
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• W2146054707 doi "https://doi.org/10.1016/j.fishres.2014.11.006" @default.
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