Scientific Publication

Population dynamics of the freshwater clam Galatea paradoxa (Donacidae) in the Cross River, Nigeria

author(s) King, R.P - Egwali, E.C - Nkanta, N.A
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themes
regions
  • Africa
  • World
  • Western Africa
  • Sub-Saharan Africa
citation

King, R.P.; Egwali, E.C.; Nkanta, N.A. (1991). Population dynamics of the freshwater clam Galatea paradoxa (Donacidae) in the Cross River, Nigeria. Fishbyte 9(2): 34-36
Population dynamics of the freshwater clam Galatea paradoxa (Donacidae) in the Cross River, Nigeria

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Abstract

The growth of freshwater clam Galatea paradoxa (Born) from the Cross River, Nigeria, was studied based on a count of growth checks on shells, presumed to be laid down annually. Mean lengths at ages 1 to 5 were 4.1 cm, 5.9 cm, 7.4 cm, 8.4 cm and 9.0 cm, respectively; maximum observed size was 11.1 cm. Growth conformed to the von Bertallanffy growth model with the parameters L sub( infinity ) = 11.2 cm, K = 0.3 year super(-1) and t sub(0)=0.5 year super(-1). Total and natural mortalities were estimated at 0.8 and 0.3 year super(-1), respectively; the statusof the fishery is briefly discussed

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