Growth Rates of Modiolus Americanus (Leach) in Relation to Mechanical Disturbance and Darkness
The shell length increment of Modiolus americanus (Leach) from Discovery Bay, Jamaica, was measured during November 1974-January 1975 with a nondestructive optical method, LASER diffraction. Mussels hanging freely in the water where they were disturbed by wave action did not grow significantly, while mussels growing in a fixed position in indoor aquaria with normal day-night rhythm, had an average growth rate of 0.27 μm/day. When mussels in the same fixed position were kept in darkened aquaria the growth was significantly larger, in average 0.61 μm/day. There is a pronounced individual variation in growth rates with coefficient of variation ranging from 31 to 60%.
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Document Type: Research Article
Publication date: July 1, 1976
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