DETERMINATION OF GONADOSOMATIC INDICES IN NOTOPTERUS NOTOPTERUS

ABSTRACT

Maturation in fishes follows a cyclic pattern with spawning adjusted to the most propitious time of the year there by ensuring maximum survival and faster growth of the young so as to establish the young of the year for the successful independent existence before unfavorable ecology prevails. The condition factor (K) of the fish N.notopterus was determined for different phases of the reproductive cycle. The ‘ K ‘ value increased in in preparatory and pre spawning phases, indicating that the overall condition of the fish seems to get improved towards the approach of maturing and mature stage of the gonads during pre spawning phase. The reduction of ‘ K ‘ value in spawning phase may be because of the fish exhausted due to spawning activity. The Somatic Condition Factor (KS) value is also increased during preparatory and pre spawning phase indicate the improvement in the condition of the fish during these phase and is found to be decreased in spawning and post spawning phase. The Ganado Somatic index (GSI) value is slightly increased from preparatory to pre spawning and the maximum decrease is found during spawning and post spawning phase. The Hepato Somatic index (HSI) value was high in preparatory phase and decreased in all other subsequent phases.

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