African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12209

Full Length Research Paper

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.
Email: [email protected]

  •  Accepted: 14 May 2008
  •  Published: 18 July 2008

Abstract

 

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.