International Journal of Agricultural Policy and Research
Vol.7 (2), pp. 17-31, March 2019
Available online at https://www.journalissues.org/IJAPR/
Author(s) retain the copyright of this article. Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License.
Original Research Article
Growth patterns and exploitation status of the spiny lobster species Palinurus mauritanicus (Gruvel 1911) in Mauritanian coasts
Amadou Sow1, Bilassé Zongo*2 and T. Jean André Kabre2
1Institut Mauritanien des Recherches Océanographiques et des Pêches (IMROP), Mauritanie
2Université Nazi Boni, LaRFPF, Burkina Faso
*Corresponding Author Email: azongo(at)hotmail.fr
In the Mauritanian coasts, fishing effort on Palinurus mauritanicus contributes in the decline of the stock. From February to August 2015, samplings were carried out monthly in order to study the growth patterns and the stock status to provide further information for sustainable management and exploitation of the species. A total of 12008 individuals were collected. Total length (Lt) and cephalothoracic length (Lc) were measured with a vernier caliper. The species were separately weighed on a digital balance and their sex noted. The collected data were entered on excel spreadsheet in order to analyse growth kinetics, exploitation kinetics and estimate fish mortality using FISAT II software. Male of P. mauritanicus had an average Lc = 130 mm and an average Lc = 111 mm. The annual length frequency distribution gave respectively 6 and 7 age-groups for females and males. Lc-Lt relationship and Lc-Wt relationship showed a minor allometry (b < 3 for both). The linear growth evaluation (Elefan I method), showed that the maximum cephalothoracic length (Lc∞ ) = 199.5 mm, k = 0.22 for females, Lc∞ = 220.5 mm, k = 0.32 for males, and Lc∞ = 220.5 mm, k = 0.21 for both sexes. With a total mortality (Z) = 1.35year-1, males were more vulnerable than females with respectively an exploitation rate (E) = 0.82 and 0.79. The mortality rates and the relative Recruit Yield (Y/R) indicate that the stock is in a level of overfishing. Efforts need to be considered for the recovery of P. mauritanicus population.
Key words: Spiny lobster, Palinuridae family, growth parameters, exploitation, Mauritanian coasts