Inducing spawning of common carp (Cyprinus Carpio) in a natural pond
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Date
1998-11-07
Authors
Nathanael, S.
Edirisinghe, U.
Journal Title
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Abstract
Development of cost-effective propagation systems for common carp so as to
eliminate the necessity of stocking reservoirs with fingerlings is essential for
sustainable fisheries. To achieve this objective, preliminary investigations on
developing a relatively cheap and easy propagation method was carried out under
natural conditions in a mud pond (0.4 ha in extent) in the Department of Animal
Science, University of Peradeniya.
To understand the breeding pattern, standard techniques were used to determine
the fecundity and the gonado-somatic indices of monthly fish samples collected from
the pond. Fecundity of pond cultured females ranged from 15, 734 to 65,642 with total
length and weight varying from 18.5 to 31.5 em and 143.0 to 542.9 g respectively.
Analysis of gonado-somatic indices revealed year round breeding with four spawning
peaks corresponding to the onset of heavy rain.
Common carp could be "trained" to lay eggs on artificial egg collectors called
"kakabans" to increase survivorship of eggs, using stimulants such as edible plants,
aquatic macrophytes such as the water hyacinth, or artificial water currents.
"Kakabans" made of coconut or kitul fibre were more suitable than plant material since
they were resistant to decay and could repeatedly be re-used. Horizontal placement
was preferred to vertical hanging. The fertilization and hatchability rate on "kakabans"
made of fibrous substrates was 92-96% and the hatching period of eggs was between
2-3 days.
These results highlight the potential for developing appropriate systems
whereby common carp could be propagated at least cost in large, deep Sri Lankan
reservoirs such as the Victoria, where common carp show successful natural
recruitment to the fishery.
Description
Keywords
Cyprinus carpio , Natural Pond , Common Carp
Citation
Proceedings & Abstracts of the Annual Research Sessions November 07, 1998,University of Peradeniya,Peradeniya, Sri Lanka,pp.13