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Studies on Effect of Claw-Ablation on Growth and Survival of Macrobrachium Rosenbergii (De Man)

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Title Studies on Effect of Claw-Ablation on Growth and Survival of Macrobrachium Rosenbergii (De Man)
 
Creator Shivakumar, M.
 
Contributor Shivanand Murthy, H.
Basavaraja, N.
Benakappa, S.
Venu Gopal, M.N.
Krishna Bhatt, C.A.
 
Description Ph.D. Thesis
The large size variations of mature pond grown populations of M. rosenbergii
constitute a major obstacle in increasing the profitability of the culture of this species.
It is clear from our study that the large second pair of claws/chelipeds, from which
the genus derived its name, is involved in this phenomenon.
Claws are found to be essential in increasing the variance in growth rate
among communally grown young M. rosenbergii. A similar result was observed in
young lobsters in laboratory studies (Aiken and Young-Lai, 1979, 1981; Kendall et
al., 1982). Differences in growth rates of crustaceans could result from either
differential frequency of molting or different size increments per molt or both. In
juvenile American lobsters, claw-ablation reduced extent of molt delay in a
subordinate individual (Cobb et al., 1982). The mechanism of social control of
growth in claw-ablated M. rosenbergii is also attributable to reduced aggression,
uniform growth rate and increased survival rate. Though, the claws are essential for
catching food item and for defence mechanism in natural waters, in feed-based
culture systems, they do not have much role. Since they have regeneration capacity
their removal will support the somatic growth positively there by increasing net
biomass.
Additional cost of Rs. 2000/- for every 10,000 seeds is required for clawablation
i.e., at 20 paisa/ablation/animal, when it is presumed that 100% survival in
the pond. Though we need to invest extra money on ablation, we get more number of
good sized individuals (>30 g.) and it gets premium price in the market.
The results of the present experiment indicate that claw-ablation has highly
significant (**P
 
Date 2016-07-04T11:24:18Z
2016-07-04T11:24:18Z
2008-09-12
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/68395
 
Language en
 
Format application/pdf
 
Publisher Karnataka Veterinary, Animal and Fisheries Sciences University, Bidar