ISSN 2375-0715
African Journal of Fisheries Science ISSN 2375-0715 Vol. 7 (1), pp. 001-009, January, 2019. © International Scholars Journals
Full Length Research Paper
Recruitment patterns and standing stocks of the beaked clam Eumarcia paupercula (Holten, 1802) in Maputo Bay, Mozambique
13E. D. Mugabe, 12C. A. Amoda, 3C.L. Griffiths
1Centre of Coastal Studies and School of Marine and Coastal Sciences, Eduardo Mondlane University, Chuabo Dembe, P.O. Box 128, Quelimane, Mozambique.
2National Institute of Fisheries Research, Av. Mao Tsé Tung 4603, Maputo, Mozambique.
3Marine Biology Research Institute and Department of Biological Sciences, University of Cape Town, Rondebosch 7701, South Africa.
Corresponding author E-mail: [email protected]
Accepted 24 October, 2018
Abstract
The beaked clam Eumarcia paupercula is abundant in Maputo Bay, where it forms the basis of a substantial artisanal fishery. This study aimed to understand the recruitment pattern of the E. paupercula population of Costa do Sol beach and to monitor seasonal changes in its standing stocks and how these are impacted by the fishery. Results from November 2012 – April 2014 sampling programme showed that recruitment took place throughout the year, with the highest recruitment rates occurring during early winter, with over 250 recruits.m-2 and lowest in late winter and early summer, with less than 20 recruits.m-2. The abundance of the adult stock seemed to have little influence on recruitment rates. The total standing stock of E. paupercula across the approximately 144 000 m2 study site at Costa do Sol beach varied from a minimum of 7 238 kg in May to a maximum of 54 164 kg in November with a mean of approximately 25 300 kg. Seasonal changes in standing stock were controlled mainly by patterns of recruitment and of removal of adult clams by the artisanal fishery.
Keywords: Stock-recruit relationship, length frequency, Veneridae, bivalve fishery, tidal flat.