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)
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Creator |
Shivakumar, M.
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Contributor |
Shivanand Murthy, H.
Basavaraja, N. Benakappa, S. Venu Gopal, M.N. Krishna Bhatt, C.A. |
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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 |
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Date |
2016-07-04T11:24:18Z
2016-07-04T11:24:18Z 2008-09-12 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/68395
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Language |
en
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Format |
application/pdf
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Publisher |
Karnataka Veterinary, Animal and Fisheries Sciences University, Bidar
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