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Abstract

Monofilament trammel net fishing tests were conducted in Aswan's River Nile to evaluate trammel net size selection and its impact on dominant species. Selectivity was determined for Oreochromis niloticus and Coptodon zillii captured using 56-, 64-, and 76-mm inner layer mesh sizes. The selectivity parameters were calculated using SELECT method. The bi-modal model accurately fit the selectivity curve for O. niloticus and C. zillii. In contrast, the linear equation described length-girth relationships: G= 0.7263TL+0.8342 for O. niloticus and G= 0.6957TL+1.5202 for C. zillii. The linear equation D= 0.361TL+0.3071 for O. niloticus and D= 0.3611TL+0.3886 for C. zillii described length-depth relationships. This study is the first to examine trammel net selectivity in Aswan, Egypt. The effects of mesh sizes on O. niloticus and C. zillii stock may be useful. To support O. niloticus and C. zillii stocks, Aswan fisherman should use 64-mm mesh nets.

Keywords

Oreochromis niloticus Coptodon zillii Select model Mesh size

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The authors transfer the copyrights of their papers to the Iranian Society of Ichthyology. However, the information could be used in accordance with the Creative Commons licence (Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

How to Cite
SABER, M. A., FARRAG, M. M. S., KASSEM, M. A. H., & YOUSSEF ABOUELFADL, K. (2024). Investigates trammel net size selectivity as a critical metier for management of small scale fisheries at Aswan City, Nile River. Iranian Journal of Ichthyology, 11(4), 218–228. https://doi.org/10.22034/iji.v11i4.1027
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