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Fishery and biology of Paphia malabarica (Dilwyn, 1817) off Karapad Bay, south-east coast of India

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Relation http://eprints.cmfri.org.in/15650/
http://epubs.icar.org.in/ejournal/index.php/IJF/article/view/104825
10.21077/ijf.2021.68.4.108637-02
 
Title Fishery and biology of Paphia malabarica (Dilwyn, 1817) off Karapad Bay, south-east coast of India
 
Creator Kavitha, M
Jagadis, I
Ranjith, L
Kumar, Rajan
Rahangdale, Shikha
Jasmin, F
Sasikumar, Geetha
 
Subject Clam
Fishery Biology
Molluscan Fisheries
Stock Assessment
 
Description The fishery, biology, growth and mortality of the short neck clam Paphia malabarica (Dilwyn, 1817) was studied from Karapad Bay of Thoothukudi District from January 2013 to December 2019. The annual exploitation of P. malabarica in this bay was between 7.5 t (2016) and 82.5 t (2019) with an average of 22.3 t. The average catch per unit effort (CPUE) was estimated as 17.5 kg person-1 day-1. The male clams were dominant in most of the months except during March, June and October. Chi-square test indicated that, the sex ratio between males and females (1:0.9) was not significantly different. The size at first maturity (Lm) was estimated as 21 mm for P. malabarica in this bay. High percentage (>65%) of mature females was observed between September and December and this pattern suggests spawning season during this period with peak spawning during November. The clam size in the fishery ranged between 24.2 and 55.4 mm (average 39.3 mm) and around 75% of the total catch belonged to 33-41 mm size group. The asymptotic length (Lāˆž) and growth coefficient (K) were estimated as 55.6 mm and 1.1 respectively. P. malabarica attained a length of 37, 49.5 and 53.5 mm at first, second and third year respectively. The tmax was found to be 2.7 year and the growth performance index (Ƙā€™) was found to be 1.53. Total mortality (Z), natural mortality (M) and fishing mortality (F) were estimated as 4.36, 2.64 and 1.72 year-1 respectively. The assessment revealed that 95.8% of the exploited catch is above the optimum length (Lopt), of 30 mm. The exploitation rate (E) and exploitation ratio (U) were 0.394 and 0.389, respectively and the maximum sustainable yield (MSY) of P. malabarica was 104.8 t which shows the present catch was 21% below the MSY. The above results indicate scope for expansion of the fishery of the species in Karapad Bay.
 
Publisher ICAR-Central Marine Fisheries Research Institute
 
Date 2021
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/15650/1/IJF_2021_Kavitha%20M.pdf
Kavitha, M and Jagadis, I and Ranjith, L and Kumar, Rajan and Rahangdale, Shikha and Jasmin, F and Sasikumar, Geetha (2021) Fishery and biology of Paphia malabarica (Dilwyn, 1817) off Karapad Bay, south-east coast of India. Indian Journal of Fisheries, 68 (4). pp. 22-29.