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Growth and health status of cultured edible oyster, Crassostrea madrasensis (Preston) in the Panadura estuary, Sri Lanka

Authors:

M.A.P.C. Piyathilaka,

Department of Zoology, Faculty of Science, University of Kelaniya, Kelaniya., LK
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M. Hettiarachchi ,

Department of Zoology, Faculty of Science, University of Kelaniya, Kelaniya., LK
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W.M.T.B. Wanninayake

Department of Aquaculture and Fisheries, Faculty of Livestock, Fisheries and Nutrition, Wayamba University of Sri Lanka, Makandura, Gonawila., LK
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Abstract

To intensify the production of edible oyster in Sri Lanka in the future it is essential to analyse the status of the present culture practices. The present study was carried out to investigate the growth and health of cultured edible oyster, Crassostrea madrasensis in relation to the prevailing water quality parameters and external fouling in a small-scale, commercial farm located in the Panadura estuary, Sri Lanka.

The mean growth rate in shell length and shell width varied between 0.06 ± 0.01 mm and 2.19 ± 0.09 mm and between 0.02 ± 0.02 and 2.11 ± 0.39 mm per week, respectively. There were positive significant relationships between the growth rate in shell width and salinity, as well as the conductivity of culture water (p < 0.05). Mean total dissolved solids in culture water had a positive significant relationship to the growth rate of oysters in shell length (p < 0.05). External fouling organisms that grew on the outer shell surface caused significant reduction in growth rate as well as the weight gain of cultured C. madrasensis (p < 0.05).

Histological sections of the gills, mantle, digestive gland and digestive tract of oysters exhibited structures similar to plasmodia of a haplosporidian parasite, which reached the stage of rupturing during the period of low salinity. C. madrasensis could tolerate the low salinity, ranging from 0 gL-1 to 6.0 gL-1 with 83.0 ± 2.47 % survival; the highest mortality recorded during the period with low salinity in culture water was 15.00 ± 2.50 %.

DOI: http://dx.doi.org/10.4038/jnsfsr.v40i3.4694

J.Natn.Sci.Foundation Sri Lanka 2012 40(3):201-210

How to Cite: Piyathilaka, M.A.P.C., Hettiarachchi, M. and Wanninayake, W.M.T.B., 2012. Growth and health status of cultured edible oyster, Crassostrea madrasensis (Preston) in the Panadura estuary, Sri Lanka. Journal of the National Science Foundation of Sri Lanka, 40(3), pp.201–210. DOI: http://doi.org/10.4038/jnsfsr.v40i3.4694
Published on 26 Sep 2012.
Peer Reviewed

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