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Status of population dynamics of the Asian wedge clam, Donax scortum (Bivalvia: Donacidae): a first report from Asia

Published online by Cambridge University Press:  30 August 2016

Yambem Tenjing Singh
Yambem Tenjing Singh*
Affiliation:
Department of Biosciences, Mangalore University, Mangalagangothri 574 199, Karnataka, India Conservation of Coastal and Marine Resources Division, National Centre for Sustainable Coastal Management, Chennai 600 025, Tamil Nadu, India
*
Correspondence should be addressed to: Yambem Tenjing Singh, Department of Biosciences, Mangalore University, Mangalagangothri 574 199, Karnataka, India email: [email protected]
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Abstract

For the management of mollusc resources, knowledge of various population parameters and exploitation level of the population of wedge clams are needed. Population dynamics on wedge clam, Donax scortum is still unknown in Asia. FAO-ICLARM Stock Assessment Tools (commonly known as FiSAT) was used for calculating population parameters of this species. The specimens of D. scortum were collected from Padukere sandy beach at monthly intervals from February 2009 to January 2010. Asymptotic length (Lα) was 70.88 mm and growth coefficient (K) was estimated at 0.64 year−1. The sizes attained by D. scortum were 33.51, 51.17, 60.49, 65.40, 67.99 and 69.36 mm at the end of first, second, third, fourth, fifth and sixth years of age, respectively. Density of clams ranged from 2 ind. m−2 (June, July and August) to 8 ind. m−2 (December). Biomass (total weight) of clams ranged between 10.084 g m−2 (August) to 185.100 g m−2 (December). Total mortality (Z) for D. scortum was 3.20 year−1. Natural mortality (M) and fishing mortality (F) were 0.64 year−1 and 2.56 year−1 respectively. Exploitation level (E) was computed as 0.80, indicating that the fishery of D. scortum in the coastal waters of Karnataka is overexploited.

Keywords

Wedge clamDonax scortumdensitybiomassgrowth curveagerecruitmentmortalityexploitationKarnataka
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 97 , Issue 8 , December 2017 , pp. 1635 - 1642
Copyright
Copyright © Marine Biological Association of the United Kingdom 2016 

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