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Harvest status investigating of Indian mackerel (Rastrelliger kanagurta Cuvier, 1817) using a limited data approach in the northern waters of Oman Sea
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Seyedhmdreza Hashemi    , Mastooreh Doustar , Somayeh Mollaee , Paria Akbary |
| Offshore Fisheries Research Center, Iranian Fisheries Science Research Institute, Agricultural Research,Education and Extension Organization (AREEO), Chabahar, Iran. , seyedahmad91@gmail.com |
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Abstract: (31 Views) |
Background and Objectives:The Persian Gulf and the Oman Sea encompass a variety of aquatic species, among which tuna fish are of great importance. The Indian mackerel (Rastrelliger kanagurta) is one of the tuna species whose catch levels have shown significant fluctuations in recent years. This study aimed to estimate the population characteristics and exploitation status of the Indian mackerel from four landing sites: Pazm, Konarak, Beris, and Pasabandar, as well as time series catch data along the coasts of Sistan and Baluchestan Province.
Methods:Random sampling was conducted monthly from commercial landings at the selected stations from April 2021 to March 2024. The samples were then subjected to biological measurements (fork length measurement). Fork length was measured using a biometrical ruler with an accuracy of 1 cm, and the fish weight was measured with a scale accurate to 50 grams. Growth parameters included an infinite length (L∞) of 40 cm, growth coefficient (K) of 0.58 yr-1, natural mortality (M) of 0.82 yr-1, fishing mortality (F) of 1.26 yr-1, total mortality (Z) of 2.47 yr-1, exploitation rate (E) of 0.51 yr-1, and the time at zero length (to) of -0.25, which were calculated. Data analysis was performed using Excel, Rstudio (2024.12.0), and R (4.4.2) software at a significance level of 0.05.
.Findings:The mean (maximum-minimum) of the biomass to biomass at maximum sustainable yield (B/BMSY), the ratio of current fishing mortality to fishing mortality at maximum sustainable yield (F/FMSY), and the biomass to carrying capacity or saturation (S=B/K) of the CMSY model were calculated as 1.33 (0.83-1.59), 0.97 (0.80-1.53), and 0.66 (0.41-0.79), respectively. The maximum sustainable yield (MSY) of the CMSY model was estimated at 1.8 (1-3) thousand tons.
Conclusion:Based on the obtained results, there are no signs of overfishing; however, it is recommended that a precautionary approach |
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| Keywords: Indian mackerel, Oman Sea, B/BMSY indicator, F/FMSY indicator |
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Full-Text [PDF 1884 kb]
(15 Downloads)
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Type of Study: Research/ Original/ Regular Article |
Subject:
Fisheries and Aquaculture
Received: 2026/02/15 | Revised: 2026/05/4 | Accepted: 2025/12/6 | ePublished: 2025/12/6
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