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Growth and population dynamics of short-neck clam Paphia malabarica from Dharmadom estuary, North Kerala, southwest coast of India

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Title Growth and population dynamics of short-neck clam Paphia malabarica from Dharmadom estuary, North Kerala, southwest coast of India
 
Creator Thomas, Sujitha
Nasser, M
 
Subject Clam
Population Dynamics
 
Description Growth and population dynamics of the short-neck clam Paphia malabarica from Dharmadom estuary
in north Kerala was studied for one year (December 2003-November 2004). The age and growth of P.
malabarica were studied by continuous sampling of the population and analyzing the changes in size
frequency distribution. The growth parameters of the von Bertalanffy growth function was Lāˆž = 59 mm,
annual K= 0.92, and t0 = -0.1596. The life span was estimated as 2.5 to 3 years. P. malabarica in the
estuary attains a length of 35.5 mm and 49.6 mm respectively at the end of the first and second year.
The length at first maturity (Lm) was estimated as 22 mm and 50% of the clams matured at the age of
7 months. All the clams above 22 mm were mature i.e., before reaching the first year. The total mortality
coefficient (Z) was 4.65, natural mortality coefficient (M) was 1.82 and fishing mortality coefficient (F)
was 2.83. Virtual Population Analysis showed that F was the maximum in the largest size group (35ā€“
38 mm). The mean numbers and catch by length showed that the maximum catch (16.5 t) consisted
of 35-38 mm length group. Average yield of P. malabarica for the period 2003-2004 calculated from
the length-based Thompson and Bell prediction model was 115 t and the maximum sustainable yield
(MSY) was 69.3 t. It was found that 80% of the present effort is sufficient to arrive at the MSY.
 
Publisher MBAI
 
Date 2009
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/2209/1/Sujitha_87-92.pdf
Thomas, Sujitha and Nasser, M (2009) Growth and population dynamics of short-neck clam Paphia malabarica from Dharmadom estuary, North Kerala, southwest coast of India. Journal of the Marine Biological Association of India, 51 (1). pp. 87-92.