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Some reproductive aspects of Chrysichthys nigrodigitatus (LacΘpΦde) from Cross River, Nigeria

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  • Ekanem, S.B.

Abstract

Between May and October 1990, fecundity, egg size and condition factor of Chrysichthys nigrodigitatus (LacΘpΦde) in the Cross River, Nigeria, were studied. The fecundity (F) of this population varied from 3 046 eggs (total length, L=28.5 cm) to 28 086 eggs (L=64 cm). A mean relative fecundity of 231 eggs/cm or 13 eggs/g of fish was obtained for this population. The fecundity of this population can be estimated with the formula F=2.511 ╖ L 2.30 or F=52.893 ╖ W 0.78 , total length being in cm and weight (W) in g. The mean egg diameter of this population varied from 0.65 mm to 3.54 mm. Condition factor (CF) of the population varied from 0.24 to 1.34 with 0.977 as the mean; 52.8% had CF higher than the mean and 47% had CF above unity. Smaller fish in this population were in better condition than bigger ones. The egg size and condition factor obtained in this study are evidence that the Cross River population of C. nigrodigitatus can provide excellent broodstock.

Suggested Citation

  • Ekanem, S.B., 2000. "Some reproductive aspects of Chrysichthys nigrodigitatus (LacΘpΦde) from Cross River, Nigeria," Naga, The WorldFish Center, vol. 23(2), pages 24-28.
    • Handle: RePEc:wfi:wfnaga:35813
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    File URL: http://hdl.handle.net/20.500.12348/2408
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    References listed on IDEAS

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    1. King, R.P., 1997. "Length-fecundity relationships of Nigerian fish populations," Naga, The WorldFish Center, vol. 20(1), pages 29-33.
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      Keywords

      Brood stocks; Reproduction; Fecundity; Nigeria; Chrysichthys nigrodigitatus;
      All these keywords.

      JEL classification:

      • Q00 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - General - - - General

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