Browsing by Author "Nathanael, S."
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Item Changing trends in the fishery of the Victoria reservoir(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1997) Nathanael, S.; Silva, E.I.L.Item The coconut tree(1989) Nathanael, S.Item Comparison of length-weight relationships and fecundity between pond cultured and reservoir (Victoria) inhabiting common carp (Cyprinus carpio)(Univeristy of Ruhuna. Kamburupitiya, 1998) Nathanael, S.Comparisons were made on the length weight relationships, fecundity and egg diameter distribution of yolked ova in mature ovaries of pond cultured female common carp with those collected during the same period from the Victoria reservoir. Irrespective of the location, the condition factor of gravid females was within the range 1.6-2.0. However, the average body condition of ripe females from the reservoir was better than those from the pond. Yolked ova in ripe (Stage vi) ovaries had a diameter between 0.85 to 1.70 mm. The single mode indicates that the ova ripen simultaneously and are shed in a single batch. Fecundity is linearly related to body and gonad weight, and curvilinearly to body length. Fecundity of pond cultured females with a length of 30.8 to 46.0 cm had a fecundity between 49, 070 and 240, 100 Irrespective of the location, the fecundity of females within the same length group were within the same range. The presence of larger sized females with a correspondingly high fecundity and good body condition which produce heavily yoilked eggs indicated that under the prevailing conditions, there is potential for the establishement of a common carp based fishery in large , deep reservoirs like the Victoria, Development of pond culture to re-stock heavily depleted reservoirs with fingerlings is therefore feasible.Item Comparison of morphometrics and meristic characteristics of two catfishes Plotosus limbatus and Clarias brachysoma(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2007) Wasala, W.M.T.K.; Edirisinghe, U.; Nathanael, S.; Sundarabarathy, T.V.Item Comparison of the breeding patterns of three cichlid species colonizing the Victoria reservoir(1996) Nathanael, S.; Silva, E.I.L.Item Decline in fish yields at the Victoria reservoir(1995) Nathanael, S.; Silva, E.I.L.Item Fishery of the victoria reservoir:past present and future(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2002) Samarakoon, S.M.M.; Nathanael, S.; Edirisinghe, U.Item Item Reproductive biology and proximate chemical composition of the filamented barb, Puntius filamentosus in the Victoria reservoir(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2003) Samarakoon, S.M.M.; Nathanael, S.; Edirisinghe, U.Item A study to determine factors which could influence the population of the ecto-commensal temnocephalid Paracaridinicola platei (Fernando, 1952) Baer, 1953(National Science Council:Colombo, 1990) Nathanael, S.Item The feasibility of developing the Victoria reservoir into a sustainable fishery(1992) Nathanael, S.; Silva, E.I.L.Item The proximate composition and element spectrum of the flesh of the three Cichlid species in the Victoria reservoir(1997) Nathanael, S.; Silva, E.I.L.