Length-Based Fishery Status of Indo-Pacific King Mackerel (Scomberomorus guttatus) in the Iranian Part of Persian Gulf and Oman Sea Waters
Length-Based Fishery Status of Indo-Pacific King Mackerel (Scomberomorus guttatus) in the Iranian Part of Persian Gulf and Oman Sea Waters
Seyed Ahmadreza Hashemi1*, Mastooreh Doustdar2, Rahimeh Rahmati3 and Asadullah Ali Muhammad4
ABSTRACT
Between the months of August 2020 and February 2023, the exploitation ratio and population dynamics of the king mackerel (Scomberomorus guttatus) in the Indo-Pacific region were investigated. The data for this study was collected from three different landing sites: Bushehr, Bandar Abbas, and Chabahar. In all, there were 6,094 fish specimens that were examined in the laboratory over the course of the inquiry. In terms of the link between the total sample weight and length, the equation W=0.015×CL2.89 (n=609, R2=0.85, 95% confidence range of b= 2.81-2.96) is used to represent the relationship. The population dynamics indicators consist of the following: the infinite length (Linf) of 83 centimeters, the natural mortality (M) of 0.58 per year, the growth coefficient (K) of 0.5 per year, the total mortality (Z) of 2.83±0.03 (95% confidence interval = 2.80-2.86), the fishing mortality (F) of 2.25 per year, and the exploitation coefficient (E) of 0.8. A calculation was made to determine the yearly normal standing stock (Bt) was estimated at 4,444 T. The exploitation rate (U) was estimated at 0.75, while the yearly overall stock at the beginning of the year (B0) was 13,333 T. On the other hand, the fishing mortality rate at maximum sustainable yield (FMSY) is 0.75, while the exploitation ratio at maximum sustainable yield (EMSY) is 0.54. In the Iranian section of the Persian Gulf and Oman Sea, the parameters of maximum sustainable yield (MSY 1000 tons), B/BMSY ratio, F/FMSY ratio, and saturation (S) ratio were determined at 11(9-15), 1.37(0.83-1.60), 0.67(0.57-1.11) and 0.67 respectively. According to the calculated parameters, Indo-Pacific king mackerel species is in full fishing status.
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