Journal of
Ecology and The Natural Environment

  • Abbreviation: J. Ecol. Nat. Environ.
  • Language: English
  • ISSN: 2006-9847
  • DOI: 10.5897/JENE
  • Start Year: 2009
  • Published Articles: 371

Full Length Research Paper

Reproductive aspects of common carp (Cyprinus carpio L, 1758) in a tropical reservoir (Amerti: Ethiopia)

Mathewos Hailu
Ziway Fisheries Resources Research Center, Ethiopia.
Email: [email protected]

  •  Accepted: 30 July 2013
  •  Published: 30 September 2013

Abstract

The reproductive aspect of common carp (Cyprinus carpio L, 1758) in the Amerti reservoir (9°.63 N, 37°. 23 E) was studied monthly between August 2011 and July 2012. A total of 496 specimens, comprising 231 males and 265 females were captured during the sampling period. There were no significant differences between the sex ratio (c2 = 2.33; P= 0.126). The mean ± SD of Fulton’s condition factor was 1.22 ± 0.14 for both sexes. The size at first sexual maturity (L50) for male Cyprinus carpio was 27.2 cm fork length (FL) while the females attained L50 at 28.3 cm FL. Absolute fecundity (F) varied between 36955 and 318584 with a mean ± SD of 170937 ± 13084 for the length group (270-470 mm FL). The relationship between F and FL were significant (F=0.224*FL3.708, R² = 0.933; p<0.001). The  mean  monthly water  temperature  that  ranged  from  18.9  to 23.1°C  during  the  study  period  appears  to  favor  year  round  spawning  of common  carp  in  the reservoir.

 

Key words:  Breading season, fecundity, maturity, species introduction.