CUMULATIVE INBREEDING RATE IN HATCHERY-REARED INDIAN MAJOR CARPS OF KARNATAKAAND MAHARASHTRA STATES
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Authors
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P. K. Deepak
Central Institute of Fisheries Education, Fisheries Universi(v Road,
Versova, Mumbai- 400 061, India
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Shrinivas Jahageerdar
Central Institute of Fisheries Education, Fisheries Universi(v Road,
Versova, Mumbai- 400 061, India
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M. K. Sharada
CSIR Centre for Mathematical Modelling and Computer Simulations,
NAL Belur Campus, Bangalore- 560 037, India
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N. K. Indira
CSIR Centre for Mathematical Modelling and Computer Simulations, NAL Belur Campus, Bangalore- 560 037, India
Abstract
The state fisheries department hatcheries are the major suppliers of seed
to the farmers in Karnataka and Maharashtra. The broodstocks of these
hatcheries are genetically closed units. In the present study, etJective
population size and cumulative inbreeding rates were estimated. The
cumulative inbreeding rates ranged from 2.69 to 13.75, 8.63 to 15.21 and 3.02 to 5.88 per cent for catla, mrigal and rohu, respectively, in Karnataka state hatcheries. In Maharashtra, the cumulative inbreeding rates for catla ranged from 7.81 to 39.34 per cent and it was 5.84 to 14.09 and 2.46 to 10.20 per cent for mrigal and rohu, respectively. To estimate the inbreeding rates in future generations, predictive models were developed using linear regression, and polynomial and power equations separately for each hatchery. Their multiple correlation and standard errors suggested that simple linear regression can predict the future inbreeding rate efficiently.
Keywords : Karnataka, Maharashtra, brood stocks
