|
Some aspects of the
reproductive biology of Tilapia mariae (Boulenger
1901) in a small lake in south-eastern Nigeria
Afamdi Anene1* and Peter U. Okorie2
1Faculty
of Agriculture and Vet. Med., Abia State University, Umuahia
Campus, P. M. B. 7010, Umuahia, Abia State, Nigeria.
2Department
of Animal and Environmental Biology, Imo State University,
P.M.B. 2000, Owerri, Imo State, Nigeria.
*Corresponding author. E-mail:
afamanene31@yahoo.com.
Tel: +2348037107726.
Accepted
14 May, 2008 |
|
Some aspects of the reproductive biology of Tilapia mariae
of Umuoseriche man-made lake such as fecundity of female
fishes was determined gravimetrically after the sex had been
established. The ratio of male to female T. mariae
of Umuoseriche Lake was 1:1.56. The numbers of female
fishes were greater in 110 – 145 mm and 185 – 195 mm size
groups. Males dominated the 135 – 175 mm size group.
Gonadosomatic index ranged between 1.4 and 3.4 with a mean
of 2.25
±
0.7. Mean ovarian weight was 1.7
±
0.3 g and a mean fecundity of 1705
±
629 eggs/ clutch.
Key
words:
Tilapia mariae, gonadosomatic index, fecundity. |
