Explain composite fish culture??
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The composite Fish Farming is the aquaculture technique wherein more then one fish are cultivated or cultured in the same water body or pond. These fishes have different food habits like some are surface feeders i.e., they take the live food of plankton or microorganisms and microalgae present on the surface of the water, some are mid-water feeders i.e., they consume submerged plants, swimming insects and such other organisms staying in the mid-water. The third category is of bottom feeders which feed on the detritus, mud living organisms etc., on the bottom.
The advantage of this technique is that these three types of fishes do not compete with one another for food and space in the same water body. With this we get more production of fish from the same water body. Further, there is no wastage of food and space in the water body or pond. Every feeding niche and space are fully utilized. In India, three fishes viz., Catla, Rohu and Mrigal are employed for the purpose. The fish Catla is a surface feeder, Rohu the mid-water feeder and Mrigal is the bottom feeder.
This technique was first discovered in China where it is in full practice even to-day. There, Chinese call it Polyculture of fishes. The fishes in China, however, are different. In India, Polyculture means the combined culture of exotic fishes and Indian native Major carps (Catla, Rohu, Mrigal). The exotic fishes used for the purpose in India are Grass carp, Silver carp, Big head, Common carp and even prawns besides of course the Indian Major carps. However, there is a controversy about the naming of this combined fish culture. The name Polyculture is loosely used.
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