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Effects of season and mesh size on the selection of narrow-barred Spanish mackerel, Scomberomorus commerson in the Persian Gulf artisanal gillnet fishery

Published online by Cambridge University Press:  07 January 2021

Mojtaba Pouladi Open the ORCID record for Mojtaba Pouladi [Opens in a new window] ,
Seyed Yousef Paighambari ,
Matt K. Broadhurst ,
Russell B. Millar  and
Morteza Eighani Open the ORCID record for Morteza Eighani [Opens in a new window]
Mojtaba Pouladi*
Affiliation:
Department of Fisheries, Faculty of Fisheries and Environment Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Golestan, Iran
Seyed Yousef Paighambari
Affiliation:
Department of Fisheries, Faculty of Fisheries and Environment Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Golestan, Iran
Matt K. Broadhurst
Affiliation:
NSW Department of Primary Industries, Fisheries Conservation Technology Unit, National Marine Science Centre, Southern Cross University, 2 Bay Drive, Coffs Harbour, NSW, 2450, Australia Marine and Estuarine Ecology Unit, School of Biological Sciences, University of Queensland, Brisbane, QLD4072, Australia
Russell B. Millar
Affiliation:
Department of Statistics, University of Auckland, Private Bag 92019, Auckland, New Zealand
Morteza Eighani
Affiliation:
Department of Fisheries, Faculty of Fisheries and Environment Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Golestan, Iran
*
Author for correspondence: Mojtaba Pouladi, E-mail: [email protected]
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Abstract

In response to perceived, but unknown variation among the size selection of narrow-barred Spanish mackerel (Scomberomorus commerson) by artisanal gillnetters off Iran, and the need for such data to control exploitation as a precursor to balanced harvesting, the effects of two common mesh sizes (130 and 140 mm stretched mesh opening made from multifilament twine) on catches were investigated over one fishing year (nine months encompassing autumn to spring). Both mesh sizes mostly caught S. commerson at fork lengths (FL) larger than mean sizes at maturity (>67 cm), with the mean size selection incrementally increasing in the 130-mm mesh gillnet from autumn, and especially during spring. The greater selection occurred concurrent with an increasing condition factor (CF) among S. commerson, which typically spawn in late spring/early summer. Conversely, the relative size-selection of the 140-mm mesh gillnet decreased in spring, attributed to increasing CF precluding the capture of larger fish. Such seasonal variation in size selection might be countered by increasing mesh size to ~145 or 150 mm in spring. However, the existing 140-mm mesh might positively affect stock biomass by allowing larger, more fecund fish to avoid capture during spawning. The data support the strong influence of biological and environmental factors on gillnet size selection, which might also extend to other migratory, pelagic species.

Keywords

GillnetPersian GulfScomberomorus commersonScombridaeselectivity
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 100 , Issue 8 , December 2020 , pp. 1321 - 1325
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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