Gonadosomatic index, ova diameter and fecundity of fresh water hill stream teleost Nemacheilus moreh (sykes)

Kharat S. S.*, Khillare Y. K.

Abstract


The reproductive cycle in fishes involves changes in body weight and weight of gonads. Measurements of total weight and weight of gonad is usually correlated and reported in terms of the gonadosomatic index (GSI). The term was firstly introduced by Menin. Gonadosomatic Index per month in Neimacheilus moreh was ranged from 0.06 ± 0.02 to 0.31± 0.11 in males and 0.16± 0.07 to 10.38± 4.06 in females. Higher value of GSI for females reported in September 10.38± 4.06, and in February12.47± 5.08. The peak in males in comparison with female was seen during the September 0.31± 0.11. The data on ova diameter ranged from 09.40µ to32.81µ. GSI of females and ova diameter shows higher value 10.38% and 32.81µ subsequently in month of September. Similar pattern is also seen in month of February, It can be inferred that, Nemacheilus moreh breeds twice a year so that gonads attain maximum weight twice in a year i.e. September and February. Fecundity of females, length and weight ranged from 48 mm to 62 mm and 1.170 to 3.710 gm respectively were estimated. The number of eggs ranged from 142 to 1197 with a mean fecundity of 546.

Keywords


Nemacheilus moreh; Fecundity; Gonadosomatic Index; Ova diameter; Spawning; Gonads.

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DOI: http://dx.doi.org/10.21746/ijbio.2013.08.001

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