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Mono- vs multifilament gillnets: effects on selectivity of narrow-barred Spanish mackerel Scomberomorus commerson in the Persian Gulf

Published online by Cambridge University Press:  24 January 2020

Morteza Eighani Open the ORCID record for Morteza Eighani [Opens in a new window] ,
Shannon M. Bayse ,
Seyed Yousef Paighambari  and
Matt K. Broadhurst
Morteza Eighani
Affiliation:
Fisheries Department, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
Shannon M. Bayse
Affiliation:
Fisheries and Marine Institute, Memorial University of Newfoundland, 155 Ridge Road, St. John's, NLA1C 5R3, Canada
Seyed Yousef Paighambari*
Affiliation:
Fisheries Department, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
Matt K. Broadhurst
Affiliation:
NSW Department of Primary Industries, Fisheries Conservation Technology Unit, National Marine Science Centre, PO Box 4321, Coffs Harbour, NSW, 2450, Australia Marine and Estuarine Ecology Unit, School of Biological Sciences, University of Queensland, St Lucia, QLD, 4072, Australia
*
Author for correspondence: Seyed Yousef Paighambari, E-mail: sypaighambari@gau.ac.ir
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Abstract

Iranian 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.

Keywords

GillnetPersian GulfScomberomorus commersonselectivity
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 100 , Issue 2 , March 2020 , pp. 285 - 290
Copyright
Copyright © Marine Biological Association of the United Kingdom 2020

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