Question

If you cannot find freshwater shrimps
in a river, does it mean that the river
is polluted?​

Answer 1

Answer:

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Explanation:

Answer 2

Answer:FRESHWATER PRAWNS may be stocked into concrete and earthen reservoirs, ponds, irrigation ditches, cages, pens and natural waters. Cage and pen culture is experimental, while the production from irrigation ditches is low. Stocking natural waters and reservoirs is called fisheries enhancement. Freshwater prawns are obtained from rivers, or (less frequently) from nurseries, for stocking into open waters. Stocking PL is impractical because most would be lost through predation. Larger juveniles (2-3 g) are usually used for enhancement purposes. The topic of fisheries enhancement is only mentioned here but is described in more detail in New, Singholka and Kutty (2000). This section of the manual deals only with the management of freshwater prawns being reared in earthen ponds.