Open Access Peer-reviewed

Age Determination and Growth Rate of the Freshwater Clam Galatea Paradoxa (Born 1778) from the Volta River Estuary, Ghana

Adjei-Boateng Daniel1,, Wilson Gow James2

1Department of Fisheries and Watershed Management, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana

2Zoology Department, Trinity College Dublin, Dublin, Ireland

Journal of Aquatic Science. 2013, 1(2), 31-38. DOI: 10.12691/jas-1-2-2
Published online: August 25, 2017


The age and growth of the freshwater clam Galatea paradoxa from the Volta River estuary, Ghana was estimated during a two-year study using surface growth rings, length-frequency distributions and tagging recapture experiment. Mean lengths at ages 1 to 8 years were 19.4, 28.4, 37.1, 44.1, 49.5, 55.5, 65.6 and 73.1 mm, respectively. The von Bertalanffy growth curves obtained by three the methods were: Lt = 80.4(1-e-0.17t), Lt = 105.7(1-e-0.14t) and Lt = 104.5(1-e-0.16t) for surface rings, length-frequency distributions and tagging recapture respectively. All the age determination methods were successful in estimating the age of G. paradoxa indicating that surface ring counting is an appropriate and reasonably accurate method for simple and rapid age estimation in this species. The estimated growth curves obtained from surface rings, length-frequency distributions and the tagging-recapture experiment revealed that the methods provided similar estimates of growth rates.


surface rings, tagging-recapture, length-frequency distributions, growth curves
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