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Biometric, Length–Weight Relationships and Condition Factor of the African Clam Galatea paradoxa (Born, 1778) in the Lower Sanaga River of Cameroon

Guegang Tekou, Judith Georgette Makombu, Claudine Tiogue Tekounegning, Alexia Kévine Noubissi Chiassa, Stephane Kehou, Augustave Kenfack

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Int. J. Biosci.20(6), 185-196, June 2022

DOI: http://dx.doi.org/10.12692/ijb/20.6.185-196


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Galatea paradoxa is the most economically important bivalve species in Cameroon.This study focused on biometric and length-weight relationships in the lower Sanaga River of Cameroon from March 2018 to March 2019. Samples were collected each month manually and randomly and their biometrics characteristics were recorded. The Von Bertalanffy equation was used to assess linear growth, while relative growth was done according to Goulletquer. Condition factor was also evaluated. A total of 2340 specimens were examined. The length and average weight were respectively 59.51± 12.96 mm and 37.40 ± 19.94 g. For biometric characteristics, individuals were more abundant for size intervals between 50 and 65 mm regardless of the sampling season with the highest values during the long dry season (16%). The metric and weight values showed little variations (p<0.05) between seasons, the metric data showed a low heterogeneity (CV <25%) while weight measurement showed high heterogeneity during the light rainy season (L = 59.9 ± 14.0 mm and P = 43.2 ± 23.9 mg). The Von Bertalanffy growth parameters obtained were L∞ = 97.82mm and K = 0.26 year-1. Depending on the season, three forms of allometry growth model were observed, while the length-weight relationship showed negative allometry (b <3). Condition factors are significantly different (P˂0.05) between seasons with the lowest (1.5±0.5) and highest (2.0±1.4) values recorded in the long dry season and light rainy season, respectively. Such data is valuable for establishing a monitoring and management system of clams of the genus Galatea in Cameroon.


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Biometric, Length–Weight Relationships and Condition Factor of the African Clam Galatea paradoxa (Born, 1778) in the Lower Sanaga River of Cameroon

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