Answer:
By adopting composite fish
culture systems, intensive fish farming can be done. Both local and imported
fish species are used in such systems. In such a system, a combination of five
or six fish species is used in a single fish pond. These species are selected
in such a way that they have different types of food habits and don't compete
for food among themselves. As a result, the food available in all the parts of
the pond is used.
For example: Catlas are surface feeders, Rohus feed in the middle-zone of the
pond, Mrigals and Common Carps are bottom feeders, and Grass Carps feed on the
weeds. Together these species can use all the food in the pond without
competing with each other. This naturally increases the fish yield from the
pond.
One problem with such a composite fish
culture is that many of these fish breed only during monsoon. Even if fish seed
is collected from the wild, it can be mixed with that of other species as well.
So a major problem in fish farming is the lack of availability of good quality
seed. To overcome this problem, now some ways have been worked out to breed
these fish in ponds using hormonal stimulation. This has ensured the supply of
pure fish seed in desired quantities.
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