Demographic characteristics of Kawakawa (Euthynnus affinis) in the Persian Gulf and Oman Sea (Hormozgan province)

Document Type : Original Article

Author

Offshore fisheries research center(chabahar), Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization.

Abstract

The Persian Gulf and the Oman Sea contain a variety of aquatic species. Among which, Tuna fishes are very important and Kawakawa (E, affinis), one of the tuna fish that has increased its catch in recent years. In this research, trend catch and demographic characteristics and demographic characteristics of Kawakawa were estimated by collecting information from 4 catchment areas on the coast of Hormozgan province including Kang, Salakh, Parsian and Jask. In this study, more than 10,000 fish at the research stations were biometric and the growth parameters were infinite length of L∞ = 82 cm, growth factor K = 0.33 (yr-1), natural mortality M= 0.67(yr-1), mortality and mortality (yr-1), F = 0.89, total mortality (yr-1), Z = 1.56 and exploitation coefficient (yr-1), E = 0.57, and the time zero was -0.3 for the years. Relative production per recruitment, relative biomass per recruitment, exploitation rate and average annual standing stock for kawakawa species were estimated Y '/ Rp =0.04, B' / Rp = 0.21, U= 0.53 and b= 17071 (T), respectively. This study shows that the annual harvest of Kawakawa fish has reached its maximum and any increase in fishing effort will affect the kawakawa fish stock and will reduce the amount of exploitation in the long run.

Keywords

Journal of Marine Fishes
Volume 4, Issue 1 - Serial Number 7
September 2020
Pages 34-45

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