Age estimates of chokka squid Loligo reynaudii off South Africa and their use to test the effectiveness of a closed season for conserving this resource. Issue 4 (1st October 2020)
- Record Type:
- Journal Article
- Title:
- Age estimates of chokka squid Loligo reynaudii off South Africa and their use to test the effectiveness of a closed season for conserving this resource. Issue 4 (1st October 2020)
- Main Title:
- Age estimates of chokka squid Loligo reynaudii off South Africa and their use to test the effectiveness of a closed season for conserving this resource
- Authors:
- Lipiński, MR
Mwanangombe, CH
Durholtz, D
Yemane, D
Githaiga-Mwicigi, J
Sauer, WHH - Abstract:
- Abstract : This study presents age distributions in an exploited population of spawning chokka squid Loligo reynaudii together with their back-calculated spawning times, and considers the results in relation to the exploitation of this species. Samples were collected during two closed fishing seasons, in 2003 and 2004. Age after hatching ranged, in males, from 168 to 484 days, with a mean of 323 days (71–425 mm mantle length [ML]), and in females from 125 to 478 days, with a mean of 316 days (83–263 mm ML). Detailed analysis of catches during nine days of fishing after the end of the closed season indicated strongly that the closed season (October–November) has been beneficial for both the chokka resource and the fishery. The temporal distribution of egg-laying events for parental populations, and a high abundance of squid in the days immediately after the end of the closed season, indicate a link between the parental spawning stock and the resulting spawning stock. This hypothesis was formulated using the distribution of egg-laying events in time, the strength of egg-laying events, and data for the daily catch immediately (i.e. nine days) after the closed season. However, the hypothesis requires rigorous testing using statoliths collected over a longer period.
- Is Part Of:
- African journal of marine science. Volume 42:Issue 4(2020)
- Journal:
- African journal of marine science
- Issue:
- Volume 42:Issue 4(2020)
- Issue Display:
- Volume 42, Issue 4 (2020)
- Year:
- 2020
- Volume:
- 42
- Issue:
- 4
- Issue Sort Value:
- 2020-0042-0004-0000
- Page Start:
- 461
- Page End:
- 471
- Publication Date:
- 2020-10-01
- Subjects:
- age distribution -- catch pattern -- commercial jig catches -- egg-laying date -- statoliths -- stock–recruitment relationship
Marine biology -- Africa -- Periodicals
Marine biology -- Periodicals
Marine sciences -- Periodicals
578.7709605 - Journal URLs:
- http://www.tandfonline.com/toc/tams20/current ↗
http://www.tandfonline.com/ ↗ - DOI:
- 10.2989/1814232X.2020.1842804 ↗
- Languages:
- English
- ISSNs:
- 1814-232X
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - BLDSS-3PM
British Library STI - ELD Digital store - Ingest File:
- 22716.xml