Abstract
The age of Indian major carp, Cirrhinus mrigala (Hamilton, 1822) was determined from 208 specimens from five peninsular rivers (Mahanadi, Godavari, Kaveri, Narmada and Mahi) of India by observing the annual rings in scale. Using length-frequency method and scale study, it was found that only River Mahi holds 6+ year class of C. mrigala stocks. A strong linear relationship was found between fish length and scale radius of this species in all the riverine populations, with significant correlation coefficient. The first growth ring was found at an average length of 27.86, 28.86, 37.22, 26.77 and 25.59 cm in specimens from Mahanadi, Godavari, Kaveri, Narmada and Mahi, respectively. It is evident from our result that the fishes exhibited rapid growth rate during the first two years of their age but later, growth was moderate. Growth rate decreased successively at higher ages.
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