Kamal, Mohamed Samy and Abdelhady, Ahmed A. (2025) Long-term changes in fish landings and fish community structure in Nile Delta Lakes: Implications for fisheries sustainability. Fishes, 10 (8). p. 17.
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This study examined long-term trends (1991–2019) in landings and fish community structure in the four Egyptian Nile Delta lakes. Using fisheries data, we explored trends in the catch per unit effort (CPUE) and temporal dynamics of landings and fishing effort. Non-metric Multidimensional Scaling (nMDS) and Similarity Percentage Analysis (SIMPER) were employed to assess long-term changes in fish community structure. The results revealed variable productivity across the lakes. Lake Manzala often exhibited higher yields between 1991 and 2004, and notably in 2013 (e.g., 62,372 tons), while Lake Burullus peaked at 81,399 tons in 2019. A reciprocal trend was often observed in their total yields. Lake Burullus catches were dominated by Tilapia and Mullets, while Edku and Mariout showed lower productivity. CPUE patterns varied, with Lake Manzala showing a notable increase, peaking at approximately 52 tons per boat per year in 2013, and Lake Burullus experienced a sharp increase to about 29 tons per boat per year in 2019. A shift towards amateur fishing was observed predominantly in Lake Manzala, alongside a decline in traditional licensing. An increase in fishers operating without boats was also noted across all the Northern Lakes, with contributions from Lake Edko and Lake Manzala. nMDS and SIMPER analyses revealed distinct temporal groupings of years within each lake, indicating significant shifts in fish community structure, likely in response to invasive species, pollution, and habitat degradation. These findings underscore the need for lake-specific management and long-term monitoring to address unsustainable fishing and ecological changes, ensuring biodiversity conservation and fisheries sustainability in the region.
| Item Type: | Articles |
|---|---|
| Keywords: | Fish Landings, Sustainable Fisheries, Biodiversity, Conservation, Catch Per Unit Effort (CPUE), Fisheries Management, Fishing Community, Nile Delta Lakes, Tilapia, Fishing Efforts |
| Subjects: | Right to Resources |
| Depositing User: | Kokila ICSF Krish |
| Date Deposited: | 18 Sep 2025 10:35 |
| Last Modified: | 18 Sep 2025 10:35 |
| URI: | http://icsfarchives.net/id/eprint/22511 |
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