YABANCI personel izni Uts KAYDI

Fisheries Science

ASPECTS OF THE BIOLOGY OF SARDINELLA AURITA AND SARDINELLA MADERENSIS (CLUPEIDAE) IN THE COASTAL WATERS OF THE CENTRAL REGION, GHANA


Aspects of the biology of Sardinella aurita and Sardinella maderensis in the
coastal waters of the Central Region of Ghana were investigated from October
2013 to September 2014. The study mainly provides information on the
reproductive biology, recruitment pattern, growth and mortality parameters and
exploitation rates of the species. FiSAT was used extensively in the estimation of
the growth and mortality parameters and exploitation rates of the stocks. The
overall sex ratios of both species were not statistically different from 1: 1 ratio.
The lengths at 50 % sexual maturity of male and female S. aurita were estimated
at 16.40 and 16.74 cm TL and that of S. maderensis were 15.43 and 15.56 cm TL
respectively. S. aurita fecundity ranged from 4,834 to 63,917 whilst that of S.
maderensis ranged from 7,597 to 33,984. S. aurita species spawned over 7 –8
months, with minor and major spawning seasons from February to May and July
to October respectively. S. maderensis spawned over a relatively short period of 6
–7 months, with a minor and major spawning season from March to May and
September to October. Both species were determinate spawners producing a
single batch of yolky oocytes prior to spawning. The sardines experienced
recruitment throughout the year with high proportions at different periods. The
stocks exhibited isometric growth. S. maderensis was found to have a faster
growth rate than S. aurita with a longer life span in the latter (6 years) than the
former (5 years). The sardinella stocks are not exploited sustainably.
Recommendations to achieve sustainable exploitation are made.

Click to read full paper

Name of Author(s):
Isaac Kofi Osei
Institutional Affiliation:
Department of Fisheries and Aquatic Sciences, University of Cape Coast
Type of Publication:
M.Phil Thesis
Name of Publisher or Journal:
University of Cape Coast
Date of Publication:
2015
Number of Pages:
135