Population growth, lifespan, development and Conservation Methods of Labeo Rohita fish in Gandhi Sagar Reservoir.

Radha Anjana; Dr. Neetu Chouhan

doi:10.36948/ijfmr.2026.v08i02.70785

Population growth, lifespan, development and Conservation Methods of Labeo Rohita fish in Gandhi Sagar Reservoir.

Author(s)	Ms. Radha Anjana, Dr. Neetu Chouhan
Country	India
Abstract	Labeo rohita, also known as rohu, is an important type of fish found in India. It has become a major part of the fish population in the Gandhi Sagar Reservoir (GSR) because it was intentionally introduced as part of a planned stocking program. This man-made lake is located in Madhya Pradesh, on the Chambal River. Originally, the lake had only native fish species, but now rohu and Catla catla make up a large part of the fish caught there.Growth and Development: L. rohita in the reservoir grows steadily and consistently because the water environment is good and there is not too much competition for food and space. In ideal farming conditions, this fish can grow to 500–1,000 grams in one year. In natural river systems, the fastest growth happens in the first year, such as 34.6 cm in one study, and then slows down as the fish gets older. The species usually starts breeding in its second year. The relationship between the length and weight of L. rohita in similar environments often shows that weight increases a little slower than the cube of its length, called negative allometric growth. However, some studies in other areas have found that the growth is proportional, called isometric growth. Lifespan: Studies on L. Rohita in river systems have found that some fish can live up to 11 years. One study recorded a fish of this age. The maximum age generally recorded is close to 10 years. Gandhisagar Dam is located at 22°04′N and 75°22′E, on the border between Madhya Pradesh and Rajasthan. The reservoir spans an area of 660 km². When the dam is full, the water level is 399.9 meters, with an average area of 402 km². The maximum length of the reservoir is 67.8 km, and the maximum width is 26.1 km. Construction of the dam started in 1954 and was completed in 1960. Over 228 villages were either completely or partially submerged due to the flooding caused by the dam. Full submergence happens when the water level reaches around 50 meters, but due to low rainfall in the last three years, the dam's capacity utilization has dropped by more than 40%. During the study period in December to January 2001–2002, the water level was 381.9 meters, which reduced the area of submergence by about 250 km². Many large islands became visible again in the reservoir, and the state government allocated large areas on both banks for farming. Conservation Methods: Managing L. rohita in the Gandhi Sagar Reservoir involves several strategies to make sure the fish population stays healthy and the fishery is sustainable. Stocking Support: Keeping up with stocking young fish and fingerlings is an important management activity, especially as the reservoir environment may affect natural reproduction. RegulatoryMeasures: Laws are important for managing the fishery. These include setting closed season when fishing is not allowed, creating protected areas, and controlling fishing nets to keep them from catching baby fish. Habitat Management: The physical features of the reservoir, such as shallow areas, pools, and gorges, offer necessary feeding and sheltering spots for the fish. Cooperative Management: Working with and organizing local fishermen into cooperatives helps manage fishing Because of improvements in multiple spawning of carps, there is a growing need for high-quality larval diets. Larval fish lack the right enzymes or enough digestive enzymes to process feed efficiently. This means that breaking down feed ingredients into simpler nutrients using bacterial enzymes may help these young fish. Five experimental diets (D1–D5), each with the same calorie and protein content, were made with 32% fish meal, 34% mustard oil cake, 30% rice bran, and 2% cod liver oil. These diets were fermented in a lab using Bacillus circulans bacteria (at a rate of 108 cells per gram) at 37°C for 1 to 5 days. The bacteria used came from the intestines of young rohu fish (Labeo rohita). A non-fermented diet (RD) was also tested. Rohu eggs (average weight 0.35 mg) were given these diets freely for 21 days, feeding them every half hour from 9 a.m. to 4 p.m. Results fermenting the diets increased the amount of protein and free amino acids, while reducing crude fiber. Diets fermented for 4 and 5 days (D4 and D5) led to the best growth and survival (98% and 98.33%) of rohu eggs compared to other diets. A strong positive link was found between the RNA:DNA ratio and specific growth rate across 18 dietary groups (6 groups tested in triplicate).
Keywords	Labeo rohita, Fertilization, growth survival Labeo rohita eggs fish, intestinal microflora; fermentation; diets; growth; survival; Labeo rohita spawn ,conservation methods.
Field	Biology > Geology
Published In	Volume 8, Issue 2, March-April 2026
Published On	2026-03-07
DOI	https://doi.org/10.36948/ijfmr.2026.v08i02.70785

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Population growth, lifespan, development and Conservation Methods of Labeo Rohita fish in Gandhi Sagar Reservoir.

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