Nutritional value of fresh processed and formulated diets for the green mud crab Scylla serrata juveniles

Unnikrishnan, U (2006) Nutritional value of fresh processed and formulated diets for the green mud crab Scylla serrata juveniles. PhD thesis, Cochin University of Science and Technology, Cochin.

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Abstract

Among the crustacean candidate species for aquaculture, mud crabs of the genus Scylla are gaining importance as alternative to tiger shrimp especially in the Asian scenario, in the context of consecutive white spot disease outbreaks rendering shrimp culture, a risky affair. Literature currently available on mud crab culture has scanty information on the nutritional requirement of the species, and little scientific basis on feed management. Currently a number of locally available fresh or semiprocessed feedstuffs including kitchen left-over and animal entrails are used globally for mud crab aquaculture. The emerging scenario of mud crab culture demand scientifically designed fresh and processed feed combinations and formulated off the shelf-diets. The survey on mud crab farming made during the study clearly indicate the least concern on the feeds used and feed management. Currently farmers widely use fresh, salted and dried trash fish being a cheap source, irrespective of the quality. Feeding with fresh and cooked animal entrails was also practiced by some farmers. The use of fresh and cooked molluscan meat like clam meat was recorded rarely. The evaluation of currently used feeds and their combinations were done with a view to identifying the best feeds among the presently used feeds to maximize the feed utilization thereby reducing the wastage and to support faster growth rates of mud crabs. The studies on energy budget were aimed at gathering information on energy requirements and utilization at various moult stages and to optimise feed rationing and maximize feed utilization. Feeding trials with pellet diets were conducted to determine the protein requirement and to evaluate various diets supplemented with different lipid sources singly and in combination. The information generated from the studies on energy budget, protein requirement and evaluation of lipid sources can be used in formulating nutritionally adequate, eco-friendly, off-the shelf pellet feed for mud crab culture.

Item Type:Thesis (PhD)
Supervisor(s):Paulraj, R
Uncontrolled Keywords:Nutritional value; formulated diets; green mud crab; mud crab; Scylla serrata; juveniles
Subjects:Fish and Fisheries > Fish Nutrition
Theses
Crustacean Fisheries > Crabs
Divisions:CMFRI-Cochin > Physiology and Nutrition Pathology
ID Code:7659
Deposited By:Dr. V Mohan
Deposited On:19 Feb 2011 14:06
Last Modified:21 Jan 2014 13:56

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