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Biology of the blood clam, Anadara rhombea (Born) in Kakinada bay

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Relation http://eprints.cmfri.org.in/2560/
 
Title Biology of the blood clam, Anadara rhombea (Born) in Kakinada bay
 
Creator Narasimham, K A
 
Subject Molluscan Fisheries
Clam
 
Description A. rhombea occurs in small quantities in the Kakinada Bay and is incidentally collected
while fishing for the more abundant A. granosa- Males attain maturity at 22 mm and females at
24 mm length. It spawns during December-April (rarely in May) and major spawning Is indicated in
January-March. A single or two reproductive cycles occur during the spawning period. Increase in the
ambient water temperature and salinity seem to induce spawning The proportion of males and females
during different months, years and also in different length groups generally conforms to 1:1 ratio.
The average monthly condition index (CI) expressed as percentage of wet flesh weight in total weight,
varies from 9 6 to 15 7. The CI does not vary in relation to length. It is high before or at the
beginning of spawning and low when majority of the clams hive released bulk of the gametes. In
the post-spawning period the CI Is again high, probably due to the accumulation of body reserves.
The estimatad values of the parameters of the yon Beitalanffy growth equation ate Lco'=90.2mm,
K = 04573 per year and t" = "0 6315 yr. A. rhombea axxa'ms 47.4,63.1 and 73.1mm on completion
of 1, 2 and 3 years respectively. Various morpho netric and length-weight relationships are studied
 
Publisher CMFRI
 
Date 1988
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/2560/1/Article_36.pdf
Narasimham, K A (1988) Biology of the blood clam, Anadara rhombea (Born) in Kakinada bay. CMFRI Bulletin, 42 (1). pp. 135-144.