Sex ratio and fecundity of Chrysichthys nigrodigitatus (Family - Claroteidae) from Asejire Lake, Nigeria

Authors

  • I. O. Taiwo Olabisi Onabanjo University, (formerly Ogun State University) Ago-Iwoye
  • O. Odunaiya Olabisi Onabanjo University, (formerly Ogun State University) Ago-Iwoye

DOI:

https://doi.org/10.51791/njap.v31i1.1580

Keywords:

Chrysichthys nigrodigitatus, body weight, standard length, condition factor, goats

Abstract

Sex ratio and fecundity of Chrysichthys nigrodigitatus from Asejire Lake were examined. The length-weight relationship showed that weight was curvilinearly related to standard length. The logarithm transformation of weight against standard length gave a straight-line graph represented by the following equation:
Log W = -0.66 + 2.13 Log sl 
r2= 0.854; (p<0.001) n = 209

Males were generally more with a male : female ratio of 1:0.18. The average fish weight was 88.97g (16.28 cm standard length). Sexual maturity was attained at an average size of 45.0g (14.0 cm standard length). Relative fecundity was dependent on body weight and standard length (P< 0.05 and P < 0.01 respectively). Chrysichthys nigrodigitatus expended between 0.75% - 27.30% of body weight in egg production. The condition factor values showed that a female specimen of equal length with a male specimen is heavier. Six gonad maturity stages were identified, ovary and gonad weights increased with stage of maturity.

Author Biographies

I. O. Taiwo, Olabisi Onabanjo University, (formerly Ogun State University) Ago-Iwoye

Department of Renewable Resources

O. Odunaiya, Olabisi Onabanjo University, (formerly Ogun State University) Ago-Iwoye

Department of Renewable Resources 

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Published

2021-01-07

How to Cite

Taiwo, I. O., & Odunaiya, O. (2021). Sex ratio and fecundity of Chrysichthys nigrodigitatus (Family - Claroteidae) from Asejire Lake, Nigeria . Nigerian Journal of Animal Production, 31(1), 135–143. https://doi.org/10.51791/njap.v31i1.1580

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Articles