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Issue Date	Title	Author(s)
1986	Growth, mortality and seasonal abundance of grey mullets in Negombo estuary	Wijeyaratne, M.J.S.; Costa, H.H.
2004	The use of scales as a rapid method of identification of Mugilid species in Negombo lagoon, Sri Lanka	Rathnayake, R.K.S.; Costa, H.H.
1986	An experimental study on the culture of fry of Oreochromis mossambicus (Peters) in a peaty swamp in Sri Lanka using cow dung and poultry manure as fertilizer	Costa, H.H.; Keembiahetty, C.N.
1989	Epidemiology of the epizootic ulcerative syndrome occurring for the first time among fish in Sri Lanka	Costa, H.H.; Wijeyaratne, M.J.S.
2004	Morphometry, food, feeding and reproductive biology of Xenentodon cancila - Hamilton Buchanan (Pisces, Belonidae) from some streams in Sri Lanka	Ekanayake, V.G.S.; Costa, H.H.
1984	Morphological and histological changes in the gonads of the estuarine cichlid fish Etroplussuratensis (Bloch) during gonadal development	Pathiratne, A.; Costa, H.H.
1983	Biological Studies of the Pearl Spot Etroplus suratensis (Pisces, Cichlidae) from three Different Habitats in Sri Lanka	Costa, H.H.
1967	Responses of Gammarus Pulex (L.) To Modified Environment Iii. Reactions to Low Oxygen Tensions	Costa, H.H.
1966	The effect of exercise on the survival of Phoxinus phoxinus L. in sodium cyanide solutioins	Costa, H.H.
1998	A comparative study of the morphometrics, gill rakers and food of a stunned and a non-stunned populations of Oreochromis mossambicus (Peters) from Colombo (Beira) lake and Udawalawe reservoir	Epa, U.P.K.; Costa, H.H.