Journal article
Mono- vs multifilament gillnets: effects on selectivity of narrow-barred Spanish mackerel Scomberomorus commerson in the Persian Gulf
Marine Biological Association of the United Kingdom, Vol.100(2), pp.285-290
03/2020
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Source: InCites
Abstract
AbstractIranian coastal fishers targeting narrow-barred Spanish mackerel (Scomberomorus commerson) recently replaced their historical multifilament gillnets with those made from monofilament, evoking management concerns over potential increases in catch-per-unit-of-effort. During 20 fishing days, we compared catches from replicate surface-set gillnets that were identical in terms of mesh size (140 mm stretched opening), length (180 m), depth (30 m), hanging ratio (0.56) and spatio-temporal deployment, but had different materials: multifilament (1.8-mm diameter twisted twine) vs monofilament (0.8-mm diameter twine). Compared with the multifilament gillnet, there was a trend of greater catches (up to 1.3×) of S. commerson and another retained species, mackerel tuna (Euthnus affinis), along with one discarded species, giant catfish (Netuma thalassina) by the monofilament gillnet. However, statistical significance was restricted to E. affinis catches and a bias towards smaller S. commerson. These differences were attributed to species-specific catching mechanisms within gillnet material, with larger S. commerson retained by their teeth in the multifilament and all E. affinis more securely retained by their deeper bodies in the monofilament. Gillnet materials require regulation to preclude excessive effort on fully exploited stocks of species such as S. commerson.
Details
- Title
- Mono- vs multifilament gillnets: effects on selectivity of narrow-barred Spanish mackerel Scomberomorus commerson in the Persian Gulf
- Creators
- Morteza Eighani (Author) - Gorgan University of Agricultural Sciences and Natural ResourcesShannon M Bayse (Author) - Memorial University of NewfoundlandSeyed Yousef Paighambari (Author) - Gorgan University of Agricultural Sciences and Natural ResourcesMatt K Broadhurst (Author) - University of Queensland
- Publication Details
- Marine Biological Association of the United Kingdom, Vol.100(2), pp.285-290
- Publisher
- Cambridge University Press
- Identifiers
- 991012926976502368
- Academic Unit
- Faculty of Science and Engineering; National Marine Science Centre
- Language
- English
- Resource Type
- Journal article