• N Babu

      Articles written in Proceedings – Animal Sciences

    • Condition factor ofAmblypharyngodon chakaiensis Babu and Nair in the Chakai boat channel (Trivandrum-Kerala-India)

      N Babu N Balakrishnan Nair

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      Condition factor (K) and relative condition factor (Kn) ofAmblypharyngodon chakaiensis Babu and Nair males and females respectively have been studied in relation to the various months of the year and length groups. No significant correlation exists between the proportion of the males in the population and value of condition factor (K). On the basis ofK andKn and the various length groups in respect of males and females are arranged into three classes and their incidence in the pre-spawning, spawning and post-spawning seasons were represented. In femalesKn showed significant positive correlation with gonadosomatic index. The size at first maturity observed by direct observation of the gonads in females and males agrees with the inflexions on the curve depictingK andKn with respect to length groups. The influence of feeding intensity onK does not seem to be quite apparent inA. chakaiensis. The steady fall inK in the males seems to be related to the decrease in the percentage occurrence of males of these length group in the sample.

    • Taxonomic value of torus longitudinalis and valvula cerebelli in four species ofAmblypharyngodon Bleeker (Pisces, Teleostei, Cyprinidae)

      N Babu N Balakrishnan Nair

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      The configuration of valvula cerebelli and torus longitudinalis shows distinct variations at the level where the tractus mesencephalocerebellaris posterior establishes full connection with the granular valvula in the four species ofAmblypharyngodon. The taxonomic value of the configurational variations of mesencephalon of the four species has been discussed.

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