International Journal of Fisheries and Aquatic Studies
Volume 3, Issue 1, 2015
Growth Pattern, Whorl and Girth Relationship of the Periwinkle, Tympanotonus fuscatus var radula (Linnaeus, 1758) from a Tropical Estuarine Lagoon, Lagos, Nigeria
Author(s): Rasheed Olatunji Moruf and Aderonke Omolara Lawal-Are
Abstract: The size composition and growth pattern of the periwinkle, Tympanotonus fuscatus var radula in a tropical estuarine lagoon were investigated. The Shell length ranged from 2.5cm to 5.9cm and weight from 0.02g to 9.42g.The periwinkle showed a unimodal size distribution. Also, there is strong significant correlation between whorl number and increase in shell length (r = 0.625, P < 0.01), suggesting that the higher the shell length the more whorls an individual possesses. The girth-length and weight-girth relationships were positively correlated with calculated “b” of 0.65 and 0.40 respectively. The pattern of growth (negative allometric) was verified from the value of b < 3. The condition factor ranged between 4.6 and 10.3 and decreased with size, indicating that the species are in good condition.
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