Fisheries of
tropical rivers are very essential for the livelihoods and food security of
millions of people around the world. Fishery structure of the Yamuna River is
in central India make majority of contributions to the nutrition needs and
livelihoods of millions of people. It is largest tributary of the Ganga river.
Its length is about 1310 km. Near about twenty seven (27) species have been
identified as having highest commercial value including Cyprinus carpio and
Oreochromis niloticus in central India. Both species are exotic for India and
Indian sub-continent. C. carpio and O. niloticus with a known capability toadjust to different environmental situation and its high prospective for
aquaculture, can now be found in many rivers in India.
Introduction
of non-native fish is a global phenomenon that has occurred for well over a
century. C. carpio and O. niloticus have been intentionally spread around the
world despite recognition of their potentially detrimental effects on native
flora and fauna (open and close water bodies). C. carpio and O. niloticus are
invasive fish species for India which was introduced intentionally in Indian
water. Intentional introductions are, and have been, motivated by economic,
environmental and social considerations. Invasive species generally disrupt
recipient ecosystems leading to a loss of native biodiversity.
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