On the probable change of form in the clam Meretrix casta (Chemnitz) during its growth

Durve, V S and Dharmaraja, S K (1969) On the probable change of form in the clam Meretrix casta (Chemnitz) during its growth. In: Proceedings of the Symposium on Mollusca ; MBAI, 12-16 January 1968, Cochin.

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Abstract

While examining large samples of the clam Meretrix casta of different sizes from Athankarai estuary near Mandapam for its biological studies, it was noticed that the form of the elf m wat not constant in different size-groups. The smallest clams were more or less regular and equilateral in form while the largest had their posterior regions slightly produced thereby giving an impression of inequilaterality. To verify this, 40 clams from each of the three size-groups w«re opened and five selected external and internal dimensions of the right valves of their shells measured. The regressions of each of these characters with respect to length were compared for the three size-groups by the method of analysis of covariance. The results tend to indicate that the clam grows rapidly at its posterior region than at the anterior region and there is no equality of growth rate in the three size-groups of the clam. These suggest a change of form during growth in the case of the clam M. casta inhabiting Athankarai estuary. This may perhaps be due to the younger clams preferring the soft soil while the older ones generally inhabiting a hard soil.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Clam; Meretrix casta (Chemnitz)
Subjects:Molluscan Fisheries > Clam
Divisions:CMFRI-Cochin > Marine Capture > Molluscan Fisheries
ID Code:2366
Deposited By:Edwin Joseph
Deposited On:17 Aug 2010 05:59
Last Modified:17 Aug 2010 05:59

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