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Spawning, larval development and spat settlement of the clam, Meretrix casta (Chemnitz) in the laboratory

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Relation http://eprints.cmfri.org.in/263/
 
Title Spawning, larval development and spat settlement of the
clam, Meretrix casta (Chemnitz) in the laboratory
 
Creator Sreenivasan, P V
Rao, K Satyanarayana
 
Subject Clam
 
Description The dam, Meretrix casta (Chemnitz) WM induced to ipawn in the laboratory on 2 occasioni by
mcreating wat«' temperature by 3'-7'C from ambient lemfieraturB. Spawning was intense on both the
occasions. The fertilized ovum measured 0.08S mm. After passing through early suges of deveiofsnent,
the trochophore stage was attained by 6 hr after spawning. D-shaped free-swimming veli^er larva was
fomned by 14 hr. The leva started feeding on the microalga, Isoehrysis gaUfana, from the second day after
qtawning. The larvae sMtled as spat on dghtfi or nkth day measuring 0.216 mm x 0.201 mm 0ength x
height). It attained a size of 2.5 mm x 2.3S mm by SOth day. Pigmentation ctf the periostracum varied leading
to muiy mortis, of wbidi S major types could be recognized. Spat numbering about 50000 were produced
in each experimmt.
 
Publisher CMFRI/ICAR
 
Date 1991
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/263/1/Article_03.pdf
Sreenivasan, P V and Rao, K Satyanarayana (1991) Spawning, larval development and spat settlement of the clam, Meretrix casta (Chemnitz) in the laboratory. Indian Journal of Fisheries, 38 (1). pp. 1-8.