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Fishery and population dynamics of the sacred chank Turbinella pyrum (=Xancus pyrum Linnaeus, 1758) off Kayalpattinam in the Gulf of Mannar

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Relation http://eprints.cmfri.org.in/5894/
 
Title Fishery and population dynamics of the sacred chank Turbinella pyrum (=Xancus pyrum Linnaeus, 1758) off Kayalpattinam in the Gulf of Mannar
 
Creator Jagadis, I
Rao, G Syda
Joshi, K K
Kanthan, K P
 
Subject Molluscan Fisheries
Gastropods
 
Description The fishery and population dynamics of the sacred chank, Turbinella pyrum exploited by bottom-set gillnet off Kayalpattinam,
Gulf of Mannar were studied during 2004-2006. The size/weight range was between 80-290 mm / 60 to 1600 g. The age of
the chanks was estimated to be 20+ years and it reaches 94/135, 154/453, 197/833 and 227 mm /1195 g in 1st, 2nd, 3rd and 4th
year of life. The length–weight relationship (L-W) of T. pyrum was W = 0.001728 * L (2.47087), length–maximum shell
diameter (L-MSD) was W = 0.0011749 * MSD (2.851393). The VBGF parameters estimated are L∝ = 306.1 mm, K = 0.33 yr-1
and Wα = 2.5 kg. Estimated total mortality, natural mortality and the fishing mortality are 1.6913 yr-1, 0.45909 yr-1 and
1.2322 yr-1 respectively. From the estimates arrived at, the fishing pressure on chanks in the fishing ground is evident and
about 30% reduction from the present effort of 5,943 units operated from Kayalpattinam is required to sustain the stock and
return to the maximum sustainable yield (MSY) of 48.5 t.
 
Publisher CMFRI
 
Date 2010
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/5894/1/1.Jag.pdf
Jagadis, I and Rao, G Syda and Joshi, K K and Kanthan, K P (2010) Fishery and population dynamics of the sacred chank Turbinella pyrum (=Xancus pyrum Linnaeus, 1758) off Kayalpattinam in the Gulf of Mannar. Indian Journal of Fisheries, 57 (3). pp. 1-5.