Growth, Mortality and Exploitation of Sardinella maderensis (Lowe, 1838) in the Liberian coastal watersWehye AS1*, Amponsah SKK2, and Jueseah AS1
- Corresponding Author:
- Wehye AS
Bureau of National Fisheries
Ministry of Agriculture, Monrovia, Liberia
E-mail: [email protected]
Received Date: February 01, 2017; Accepted Date: February 25, 2017; Published Date: March 03, 2017
Citation: Wehye AS, Amponsah SKK, Jueseah AS (2017) Growth, Mortality and Exploitation of Sardinella maderensis (Lowe, 1838) in the Liberian coastal waters. Fish Aqua J 8:189. doi:10.4172/2150-3508.1000189
Copyright: © 2017 Wehye AS, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
This study examined some aspects of population dynamics of 1776 specimen of S. maderensis (Lowe, 1988) from Liberian coastal waters, from April 2013 to September 2013 (total of six months) using the FiSAT II for analysis. From the results, the growth was assumed to follow the von Bertalanffy growth function with asymptotic length (L∞) and the growth coefficient (K) estimated at 44.63 cm total length and 0.38 year-1 respectively. The growth performance index, longevity and the theoretical age at birth (t0) were estimated as 2.88, 7.51 years and -0.387 year-1 respectively. The length at first capture (Lc50=13.99 cm) was lower than the length at first maturity (Lm50=29.75 cm), an indication that most of the harvested stock were juveniles. Instantaneous rate of total mortality, natural mortality and fishing mortality were estimated as 1.24 year-1, 0.81 year-1 and 0.43 year-1 respectively. The current exploitation rate (E) and maximum exploitation rate (Emax) were calculated as 0.34 and 0.36 respectively. Results from the study indicated that the exploitation of S. maderensis is at the maximum sustainable yield coupled with the presence of growth overfishing and intense fishing pressure. Therefore, urgent management actions including increasing fishing gears mesh size and regulating fishing effort is needed to protect the S. maderensis stock.