Fishing pattern, maximum constant yield (MCY) and recruitment pattern of Thunnus tonggol in Hormuzgan province

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Abstract

Thunnus tonggol is one of the most important large pelagic fish species in Hormuzgan
province waters. Nominal catch of T. tonggol in 2010 was 32405 tones comprising 65% of
total catch of large pelagic fishes. For sustainable exploitation of the resources of this fish, we
need to identify its fishing pattern, maximum constant yield and recruitment pattern. Hence,
length and weight data were collected randomly from 6 major artisanal fish-landing sites
Hassineh, Kong, Bandar Abbas, Salakh, Sirik and Jask in Hormuzgan province, starting in
April 2010 over one year. Growth parameters L∞ and K were estimated at 112.23cm 0.3 and
(1/year), respectively. Hence, the natural mortality was calculated at 0.43 (1/year) and the
maximum constant yield was computed at 11880 tones. Length-weight power relationship,
W= aFLb, was W= 3×10-05FL2.82 that showed T. tonggol have isometric growth. Fishing
pattern indicated that almost 85% of the catch was under the size at first maturity. Maximum
recruitment pattern was in November with average fork length being 27cm. For optimum
exploitation of T. tonggol stocks, we suggest two approaches including fishing ban in the
maximum recruitment time and gear (Drift gillnet) modification.
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Iranian Scientific Fisheries Journal
Volume 20, Issue 4 - Serial Number 77
July and August 2011
Pages 129-138

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