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Biology of the blood clam Anadara granosa (Linnaeus) in Kakinada Bay

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Relation http://eprints.cmfri.org.in/1089/
 
Title Biology of the blood clam Anadara granosa (Linnaeus) in Kakinada Bay
 
Creator Narasimham, K A
 
Subject Clam
 
Description A. Granosa spawns throughout the year and the major spawning months vary between years. There
can be 2-4 reproductive cycles in a year. Males attain first maturity at 20 mm and females at 24 mm
length. The male, female ratio during different months, years and also in different length groups is
1:1. The monthly average condition index (CI) based on the percentage of wet flesh weight in total
weight varies from 15.1 to 23.1 and the same expressed as percentage of dry flesh weight in wet flesh
weight ranges from 17.2 to 24.2. The trends in the values obtained by these two methods are comparable.
The CI does not vary in relation to length. The infestation of A. granosa by the pea ciab
Pinnotheres alcocki varies from nil to 46% during different m3nths (average 10.8%). In the crabinfested
clams there is no damage to the organs of the host. The CI is low in 41.1 % of the crabinfested
samples when compared to the CI obtained in uninfested clams. The estimated parameters
of the von Bertalanffy growth equation are Lα =73.4 nun, K = 0.5816/year and t|,= —0.4088 yr.
A, granosa attains 41.1, 55.3 and 66.3 mm on completion of 1,2 and 3 years respectively. Various
morphometric and lergth-weight relationships are studied.
 
Publisher MBAI
 
Date 1988
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/1089/1/Naras_137-150.pdf
Narasimham, K A (1988) Biology of the blood clam Anadara granosa (Linnaeus) in Kakinada Bay. Journal of the Marine Biological Association of India, 30 (1&2). pp. 137-150.