Dual-Model Assessment of Sustainable Yield Benchmarks for Egyptian Red Sea Invertebrate Fisheries | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 33, Volume 29, Issue 4, July and August 2025, Page 629-642 PDF (551.42 K) | ||||
| DOI: 10.21608/ejabf.2025.441178 | ||||
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| Author | ||||
| Hamed et al. | ||||
| Abstract | ||||
| Invertebrate fishing in the Egyptian Red Sea holds significant economic value as a source of livelihood. Analysis of annual production data from 2002 to 2021 revealed substantial fluctuations in shrimp, cuttlefish, and crab yields, along with a pronounced declining trend. Catch and effort data were assessed using the Schaefer surplus production model and the Total Latent Productivity (TLP) method to evaluate sustainable exploitation levels. According to the Schaefer model, the maximum sustainable yield (MSY) for total invertebrates was estimated at 1,326 tons, requiring a fishing effort of 816 boats (FMSY). For cuttlefish and crab specifically, the MSY values were 499 and 265 tons, respectively, with corresponding FMSY estimates of 606 and 578 boats. Accounting for natural population variability, the TLP method set a total sustainable catch benchmark of 1,218 tons, with species-specific TLPs of 665.8 tons for shrimp, 245.0 tons for cuttlefish, 97.6 tons for crab, 186.7 tons for squid, and 13.6 tons for lobster. Both modeling approaches clearly indicate that current fishing pressure exceeds sustainable limits, with actual catches significantly surpassing both MSY and TLP reference points. These findings highlight the urgent need for robust fisheries management strategies that integrate both equilibrium-based and variability-responsive frameworks to ensure the long-term sustainability and resilience of invertebrate fisheries in the Red Sea. | ||||
| Keywords | ||||
| Marine invertebrates; Sustainable yield; Schaefer model; TLP; Overfishing; Egyptian Red Sea | ||||
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