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

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Relation http://eprints.cmfri.org.in/2366/
 
Title On the probable change of form in the clam Meretrix casta (Chemnitz) during its growth
 
Creator Durve, V S
Dharmaraja, S K
 
Subject Clam
 
Description 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.
 
Date 1969
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/2366/1/Article_03.pdf
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.