NISCAIR Online Periodicals Repository

Research Journals >
Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.31 [2002] >
IJMS Vol.31(3) [September 2002] >

Title: Population dynamics of siboga squid Doryteuthis sibogae (Cephalopoda/Teuthoidea) in Thoothukkudi (Tuticorin) coast, southeast coast of India
Authors: Neethiselvan, N.
Venkataramani, V. K.
Keywords: Doryteuthis sibogae
seasonal oscillation in growth
mortality parameters
recruitment overfishing
MSY-exploitation rate
yield per recruit
Issue Date: Sep-2002
Publisher: CSIR
Abstract: Study on the population dynamics of siboga squid Doryteuthis sibogae in Thoothukkudi coast revealed that the seasonal change has definite impact on the growth of this species. The growth parameters viz. L, K, t0, C, and φ were 39.5 cm, 0.4, -0.02, 0.5 and 2.9 respectively. Mortality parameters Z, M and F were estimated as 2.27 / year, 0.91 / year and 1.36 / year. Weight was more or less square function of length rather than in cubic function. This squid was found to have two recruitment seasons, one major season during December and a minor season during April. The length structured virtual population analysis revealed heavy fishing pressure on the length group 17 - 20 cm and hence the fishery of D. sibogae was not found to suffer due to recruitment overfishing in Thoothukkudi waters. Estimated total stock, average annual stock and maximum sustainable yield(MSY) were 529.47, 209.14 and 217.33 tonnes respectively. Present level of exploitation rate (U) and exploitation ratio (F/Z) was estimated to be 0.5372 and 0.6 respectively. The study infers that the cod end mesh size of the trawls of Thoothukkudi has to be increased from 10 to 25 mm to increase the yield per recruit. Further, the effort should be reduced and maintained at the exploitation ratio of 0.45 to get maximum yield per recruit. The study suggests reducing the present level of effort by 10 percent to sustain the stock of D.sibogae in Thoothukkudi waters.
Page(s): 213-217
ISSN: 0379-5136
Source:IJMS Vol.31(3) [September 2002]

Files in This Item:

File Description SizeFormat
IJMS 31(3) 213-217.pdf113.13 kBAdobe PDFView/Open
 Current Page Visits: 1458 
Recommend this item


Online Submission of Articles |  NISCAIR Website |  National Knowledge Resources Consortium |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2015 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 163182 since 01-Sep-2015  Last updated on 21-Jun-2016Webmaster: