Exploitation and Mortality of the West African Fiddler Crab (Uca Tangeri) in Mbo River, Niger Delta, Nigeria.

Publication Date: 14/01/2025

DOI: 10.52589/AJENSR-XAARYBUF


Author(s): Ating Emmanuel A., Hart Aduabobo I..

Volume/Issue: Volume 8 , Issue 1 (2025)



Abstract:

Studies on the exploitation and mortality of the crab Uca tangeri in Mbo river of Akwa Ibom State, Nigeria, was conducted for 12 consecutive months. Exploitation was calculated to be -1.62. The negative value could imply that the species is not fished or under-fished Length-frequency data was analyzed using FISAT software. Using the Shepherd’s method, asymptotic length (L∞) was 3.99cm, while the Von Bertalanffy Growth Function (VBGF) K was 0.10. Meanwhile, Powell-Wetheral plot estimated asymptotic length (L∞) was 3.58cm and Z/K was 0.72yr-1. The natural mortality(M) of Uca tangeri was 0.71yr-1. However, using length-converted catch curve, total mortality (Z) was estimated to be 0.27yr-1. The instantaneous fishing mortality (F) was calculated to be -0.44yr-1, indicating that it was not a highly fished species.


Keywords:

Exploitation, Mortality, Crab.


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