Study on biology of rohu Labeo rohita (Boche)
1984
Santana Duangsawasdi (Department of Fisheries, Bangkok (Thailand). National Inland Fisheries Inst.)
Labeo rohita or its common name as Rohu is a freshwater fish species which originated in India and distributed in Pakistan and Burma. Feeding habits are varied depend upon age and size of fish at larval stage they feed on zooplankton but change to phytoplankton at fingerings stage and vegetable or detritous at adult stage. Natural spawning is not occurred in the pond, however induced spawning can be done by hormone injection using pituitary gland from donor fish. Eggs are semibuoyant with 1 to 1.4 millimeter in diameter. The brood fish at 0.5 kilogram in weight or about 40 centrimeter in length can produce approximately 123 thousand eggs. The larvae will hatch out within 16 hours and nursing in the pond with zooplankton or additional food such as rice brane until it has 2 to 3 centrimeters in length. The fingerings can be raised with other fish species at the stocking rate of 1 fish per square meter. The total production of Rohu from fish pond in Thailand in 1982 was about 173.6 metrictons and value at 4.7 millian baht. The Department of Fisheries had stocked Rohu in various natural waters or reservoirs for increasing the fish production since it has a fast growth rate. After one year of stocking in the reservoir it was observed that Rohu can be grown up to 2 kilogram in weight and 0.5 meter in length. The nutrition value of Rohu was composed of 19 % of protein, 0.7 % of fat, 1.5 % of carbohydrate, 77.5 % of moisture and 1.3 % of ash respectively.
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