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The application of the surplus production model (SPM) for estimating maximum sustainable yield (MSY) for Cyprinus carpio in the southeastern Caspian Sea for Cyprinus carpio in the southeastern Caspian Sea
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Ziya Kordjazi *   , Mohammad Farhangi , Mohammad Larijani |
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Abstract: (498 Views) |
| The stock status of most fisheries resources is not well-known, which is associated with limited data available for stock assessment. To overcome this gap, several data-limited stock assessment models, including the surplus production model, were applied to estimate stock status of these data-limited resources where no sufficient data is available to apply the conventional stock assessment models. To estimate MSY, catch and CPUE data for Cyprinus carpio caught from the southeastern Caspian Sea were applied. Twenty-two years data (1999-2022) were analysed by SPM to estimate MSY. Three parameters including population growth rate (r), population carrying capacity (K), and initial biomass for an exploited population (Binit) required for estimating MSY were guessed 0.075 (/yr), 6952 tones, and 3500 tones, respectively by the catch-MSY model. The estimated MSY using these guessed parameters by SPM was 130 tones. While, estimated MSY using the repeated (multiple) starting points was 1320 tones. Phase plot indicated that the current status was both below the limited and the target biomass reference points. These illustrated the stock of C. carpio in the southeatern Caspian Sea is unsustainable and overfished. Since, survival of C. carpio depends the releasing hatchery reared juveniles to the wild, specific fisheries management should be applied to prevent the undersize catch and illegal fishing. |
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| Keywords: surplus production model, MSY, overfishing, Cyprinus carpio, Caspian Sea |
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Full-Text [PDF 1282 kb]
(138 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2024/01/29 | Accepted: 2024/06/10 | Published: 2024/07/22
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