Scientific Name :- Labeo Rohita
Common Name :- Rohu
Geographical habitation and prevalence :-
Firstly it was discovered by Hamilton in 1800 and named Cyprinus Denticulatus after that its name was changed to Rohita Buchanani and again changed to Labeo Dimmer and finally it was named Labeo Rohita. Hamilton had caught this fish from the rivers of lower Bengal. In 1925 it has been transplanted from Calcutta to Andaman, Orissa, Kaveri River and many a rivers of south and it was transplanted to other states in between 1944 to 1949 and in the year of 1947 it was sent to Pachai Lake Mumbai from Patna. Mainly it is the fish of river Ganges and found in Johila and Son rivers as well.
No other fish of freshwater has got the fame like it. In business terms it is known as Rohu or Rohi. Its taste, nutrient oriented size, beautiful in viewing and easy availability for rearing in small and large ponds are the main reasons for its fame.
Identification Characteristics :-
Body normally long, more bulge back than the abdomen, downward tilted snout , large eyes, small mouth, thick and frilled lips, the color of both sides and bottom is bluish silver, red spots on each scale in breeding season, reddish eyes, blush - pink feathers and there are 12-13 thorns are in each rear feather.
Eating habits :-
Organic material and pieces of plants available in the area of water column under the surface is the main food ingredients of Rohu fish. Various scientists have studied on eating habits in different phases of its life, in which according to Scientist Mukherjee after ending the yolk stage the larvae of 5 to 13 mm length eats hair like unicellular algae and at the stage of 10 to 15 mm length it eats aquatic rotifer and protozoan, afterward at the stage of above 15 mm length it takes fibroid algae (rotten plants) as its food.
Maximum size :-
Maximum length is up to 1 meter and its weight has been reported by different scientists as follows, according to scientist Hora and Pillai, it gains the weight in the first year 675 to 900 gram, in the second year 2 to 3 kilogram and in third year 4 to 5 kilogram.
Maturity and Reproduction :-
It gets the sexual maturity by the end of second year. Rainy season is its main breeding period. It breeds in natural riverine environment. It breeds only once in a year in the month of June to August.
Eggs Fertility :-
According to physical stature its egg production efficiency is in the ratio of 2.25 to 2.80 Lac eggs per kg of body weight. Its eggs are of round shaped and of 15 mm diameter, lightly reddish in color and non sticky and after fertilization it becomes 3 mm of size and completely transparent. The process of hatching completes in 16-20 hours after fertilization. According to Mukherjee (1955), the The mouth of Hatchling Developed in 2 days after hatching. and the larvae get starts to take food from water environment.
Due to its deliciousness the meat of Rohu is liked very much by the people. The Rohu is one of the most valued fish in Indian major carp. It is accustomed to live with other fishes therefore it is suitable to reared in ponds and reservoirs. It gets 500 gram to 1 kilogram weight in the period of one year rearing. It is considered as the best in taste, flavor appearance and quality so it is sold at high price and priority in the markets.