Susan, Mathew; Dr.Damodaran,R(Cochin University of Science & Technology, 1993)
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Abstract:
The present investigation is to find the hypoxic adaptations and role of carotenoids in the anaerobic catabolism of two intertidal bivalves-Sunetta scripta and Perna viridis. Physiological and cytological responses during hypoxic stress have been studied and compared to that of sublethal heavy metal (copper) exposure using two indices : total carotenoid concentration and accumulation of lipofuscin granules. A close similarity has been observed between hypoxic exposed and copper (sublethal) exposed animals regarding the total carotenoid concentration and lipofuscin accumulation. In the case of S.scripta, the total caroteniod increase at 48h of both hypoxic and heavy metal exposure was found to be nearly 40% greater than that of the control (0h). Whereas in P.viridis, the increment in the total carotenoid concentration at 48h of hypoxic exposure and 48h of heavy metal exposure were found to be nearly 87% and 95% higher than that of the control (0h) respectively.Regarding the lipofuscin accumulation, in both S.scripta and P.viridis , the characteristic features of the granule at 48h of hypoxia is very much similar to that observed at 48h of heavy metal exposure. Thus, the present study suggests that the increase in carotenoid concentration and lipofuscin accumulation expressed by bivalves under heavy metal stress can be due to the indirect effect of hypoxia.
Description:
Division of Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin university of Science and Technology
Clara, Margret Katticaran; Dr.Mohammed Salih,K Y(Cochin University Of Science And Technology, December , 1988)
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Abstract:
Enhancement and culture of bivalves presents an opportunity
to maximise and even increase production of many growing areas. Clam
culture is less intensive both for capital and labour, involves simple farming
and management techniques and is considered an efficient means of protein
production. Clams are efficient converters of primary production and
growth rate is fast with maximum production in 5-6 months. with culture,
production is less influenced by poor recruitment. Stable production
facilitates market development. Rivalves are being increasingly used
in bio-medical research. Culture practices would ensure uninterrupted
supplies of experimental material. Paucity of biological data restricts the development of efficient management and culture techniques of bivalves. This study was undertaken with a view to provide information on some aspects of biology of the bivalve S_. scripta which have hitherto been uninvestigated.
Description:
School of Marine Sciences,
Cochin University of Science and Technology