Age Pyramid Assessment of Commercially Important Fishes, Cirrhinus mrigala and Oreochromis niloticus, from the Tropical Yamuna River, India
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Abstract
Fish are important organisms as they indicate the ecological and environmental processes and the producer-consumer interactions. The fish samples of Cirrhinus mrigala and Oreochromis niloticus were collected from the Yamuna River at Allahabad (now Prayagraj), India, from August 2011 to July 2012. During the study period, 335 specimens of Cirrhinus mrigala and 516 specimens of Oreochromis niloticus were examined for the estimation of the age pyramid. The age groups varied from 0+ to 10+, and a heavy bottom or broad-based age pyramid was recorded in C. mrigala. The age groups varied from 0+ to 6+, and Urn shaped age pyramid was recorded in O. niloticus. The age group 2+ dominated by virtue of numbers in the lower stretch of the Yamuna River in both species of stock.
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