EFFECT OF RESTRICTED FEEDING OF PROTEIN LEVEL ON DIGESTIVE ENZYME ACTIVITY AND HISTOLOGICAL CHANGES IN LABEO ROHITA (HAMILTON) FINGERLINGS

To understand the applicability of restricted feeding in the fingerlings of the Indian major carp. rohu, Labeo rohita, an 60-day feeding experiment was conducted in the laboratory involving alternate day feeding of high and low protein diet, respectively. To support this experiment three experimental isocaloric (401.32 to 410.28 kcal/100g) diets of 30%, 25% and 20% crude protein designated as diet A, diet B and diet C, respectively were prepared, using locally available feed ingredients and three different feeding schedules of high protein diet continuously (diet A-30%). alternate feeding of 1-day diet A followed by 1-day diet B (lA/1B) and alternate feeding of 1-day diet A followed by 1-day diet C (lA/IC) were tested. Overall digestive enzymes activity was reported to be higher in the group fed A/1B) and the lowest was recorded in the group T2 fed A/C but histological there is no significant difference is observed

Not Available

Not AvailableLive food organisms move in the water column and serve as a source of all the nutrients such as essentialproteins, lipids, carbohydrates, vitamins, minerals, amino acids and fatty acids for larval stages of fish. Hence, they arecommonly known as “living capsules of nutrition”. Most of the fish and shellfish larvae in nature feed on these smallphytoplanktonic and zooplanktonic organisms. Zooplankton is required as the first food for much-cultured fish; for others, itcontributes to faster growth and higher survival. Among zooplankton, rotifers (Phylum: Rotifera) popularly called as wheelanimalcules forms an important group of live food organisms for use in aqua hatcheries. Rotifera includes three classes, theMonogononta, the Bdelloidea, and the marine Seisonidea. Most of the rotifer species vary between 200 to 500 micrometers insize, and are primarily omnivorous, but few species have been known to be cannibalistic. The diet of rotifers is decomposed ordead organic materials, unicellular algae and other phytoplankton. Such feeding habits make rotifers primary consumers.Rotifers in turn act as prey to carnivorous secondary consumers, including shrimp and crabs. Though rotifers are representedby about 2,500 species, the monogonont genus Brachionus is the most known form of all rotifers, and widely distributed inmarine and freshwaters worldwide. They serve as an ideal starter diet for early larval stages of many fish and prawn species inmarine as well as in freshwater, due to its smaller size as compared to Cladocerans. Among Brachionus, B. calyciflorus is themost commonly cultured freshwater rotifer for both freshwater and marine water fish species and shrimps, because of itsnumerous characteristics like small size, slow mobility and easy catchability. Moreover, B. calyciflorus has been found toconserve energy when food is scarce by decreasing its respiration rate, while other species of rotifers show no change in therespiration rate. Generally in laboratory their culture is maintained on algal concentrate with sufficient light, aeration at pHranged between 6-8 and temperature at 25oC. However, there is need to conduct in-depth study to standardize the abioticconditions like light, pH, and hardness for mass-scale production of rotifer to meet the nutritional requirements of young larvaeof fishes that encounter huge mortality during their larval stages. Successful mass scale production of rotifers will hold thekey to higher efficiency in the seed production of important species like Clarias magur, Anabas testudeneus, etcNot Availabl

Not Available

Not AvailableNot AvailableNot Availabl

Not Available

Not AvailableNot AvailableNot Availabl

Not Available

Not AvailableNot AvailableNot Availabl