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|Title:||Density, biomass, growth, age, mortality and exploitation of wedge clam, Donax incarnatus (Gmelin) from Karnataka coast, India|
Tenjing, S. Y.
|Keywords:||Age;Growth parameters;Mortality;Sandy beach;Karnataka|
|Abstract:||The size-frequency distribution method was used to study the rate of growth of Wedge clams of the genus Donax (Family: Donacidae). It was found that the clam grew up to 18.1, 24.0 and 26.2 mm at the 6th, 12th and 15th months respectively. The life span of this was less than 2 years. Recruitment pattern was continuous with one major peak in February and March. The minimum and maximum densities of clams were 22 (July) and 1885 ind.m-2 (December) respectively. Minimum and maximum values were 1.142 (July) and 193.612 (November) g.m-2 respectively. Values of von Bertalanffy growth parameters (L∝ = 28.35, K = 1.70, to = - 0.099) were estimated. The von Bertalanffy growth equation was Lt = 28.35 [1-e -1.7(t+0.099)]. Total mortality (Z), natural mortality (M) and fishing mortality (F) rates were 5.18 yr-1, 2.61 yr-1 and 2.57 yr-1 respectively. Exploitation level (E) of D. incarnatus was estimated at 0.50.|
|ISSN:||0975-1033 (Online); 0379-5136 (Print)|
|Appears in Collections:||IJMS Vol.47(09) [September 2018]|
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