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Histopathology of microsporidia infection in Indian major carp, Labeo rohita (Hamilton)

Establishment of a Network of Aquaculture Centres in Asia









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    Observations on the efficacy of carbonic acid as anesthetic for Indian major carps
    Establishment of a Network of Aquaculture Centres in Asia
    1986
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    Various anaesthetics have been in use in culture fishery operations. The present communication describes the efficacy of carbonic acid as anaesthesis for Indian major carps. Different dose levels were tried and the results discussed. It was observed that at lower concentrations the fish were anaesthetized slowly and less deeply whereas at higher concentrations the effect was rapid with greater sedation. The duration for which the fish could be safely held in the anaesthetizing bath also varied a ccording to the concentra tion of carbonic acid and size of the fish. For smaller fry, the safe dose range of carbonic acid was rather very narrow. No significent differences could be observed between the three species of Indian major carps in their response towards the carbonic acid anaesthesia.
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    Effects of green manure on fish production in polyculture ponds with silver carp and bighead carp as main species
    Network of Aquaculture Centres in Asia
    1988
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    Four types of green manure were used in the polyculture ponds with silver carp and bighead carp as the main species. Direct application of green manure resulted in a higher fish production ranging from 19.59 to 25.33 kg/ha/day. Sudan grass was best among four types of green manure.
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    Studies on the intergeneric hybrid common carp, Cyprinus carpio communis L. x mrigal, Cirrhinus mrigala (Hamilton)
    Establishment of a Network of Aquaculture Centres in Asia
    1986
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    An intergeneric hybrid between female common carp, Cyprinus carpio communis L. and male mrigal, Cirrhinus mrigala (Hamilton) was successfully produced at this Centre and reared. Its embryonic and larval developmental stages were compared with those of parents and reciprocal hybrid. The mode of development was observed to be similar to that of common carp. Though the percentage of fertilization was high (65–85%), yet survival of post-larvae was quite low, ranging from 30–40% due to occurrence of abnormality in embryos and larvae. Some aspects of morphometry of the above hybrid are described in the present communication.

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