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Abstract
In Mytella guyanensis Lamarck, 1819, the frequency distributions for the length, breadth and height of the shell are assymetrical and essentially unimodal (same age group). The maximum class frequencies are: 50-59.9 mm for the length; 22.5-26.9 mm for the breadth and 15-17.9 mm for the height. The shell is allometric and the length is an adequate parameter. During the first twelve months, the shell shows an activegrowth with an average of 5.084 mm/mo; in the next eigth months increments are in the order of 1.048 mm/mo decreasing to 0.428 mm/mo in the last ten months. Approximately 95 % of the asyntotic length (L.) is reached within twenty months of age. By the fifth month Mytella guyanensis is more than 25 mm long; however all individuals are sexually inmature.
References
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Copyright (c) 1986 Revista de Biología Tropical