Interannual variability in reproductive traits of the Patagonian toothfish Dissostichus eleginoides around the sub-Antarctic island of South Georgia

K. E. Brigden, C. T. Marshall, B. E. Scott, E. F. Young, P. Brickle

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Commercial fisheries data, collected as part of an observer programme and covering the period 1997-2014, were utilized in order to define key reproductive traits and spawning dynamics of the Patagonian toothfish Dissostichus eleginoides at South Georgia. Multi-year spawning site fidelity of D. eleginoides was revealed through the identification of previously unknown spawning hotspots. Timing of female spawning was shown to have shifted later, leading to a shorter spawning duration. A decrease in length and mass of female and male spawning fish and a reduced number of large spawning fish was found, evidence of a change in size structure of spawning D. eleginoides. During the study period fewer later maturity stage females (including spawning stage) were observed in conjunction with increased proportions of early stage female D. eleginoides. The findings are discussed in the context of reproductive success, with consideration of the possible effects such spawning characteristics and behaviours may have on egg and larval survival. This work presents the first long-term assessment of D. eleginoides spawning dynamics at South Georgia and provides valuable knowledge for both the ecology of the species and for future fisheries management of this commercially important species.

Original languageEnglish
Pages (from-to)278-301
Number of pages24
JournalJournal of Fish Biology
Volume91
Issue number1
Early online date9 Jul 2017
DOIs
Publication statusPublished - Jul 2017

Fingerprint

South Georgia and South Sandwich Islands
reproductive traits
spawning
Dissostichus eleginoides
site fidelity
philopatry
size structure
fish
maturity stage
fishery management
fisheries management
reproductive success

Keywords

  • Dissostichus eleginoides
  • fisheries management
  • reproduction
  • Shag rocks
  • spawning
  • spawning dynamics

Cite this

Interannual variability in reproductive traits of the Patagonian toothfish Dissostichus eleginoides around the sub-Antarctic island of South Georgia. / Brigden, K. E.; Marshall, C. T.; Scott, B. E.; Young, E. F.; Brickle, P.

In: Journal of Fish Biology, Vol. 91, No. 1, 07.2017, p. 278-301.

Research output: Contribution to journalArticle

@article{f9db2546daa749649621322818b94779,
title = "Interannual variability in reproductive traits of the Patagonian toothfish Dissostichus eleginoides around the sub-Antarctic island of South Georgia",
abstract = "Commercial fisheries data, collected as part of an observer programme and covering the period 1997-2014, were utilized in order to define key reproductive traits and spawning dynamics of the Patagonian toothfish Dissostichus eleginoides at South Georgia. Multi-year spawning site fidelity of D. eleginoides was revealed through the identification of previously unknown spawning hotspots. Timing of female spawning was shown to have shifted later, leading to a shorter spawning duration. A decrease in length and mass of female and male spawning fish and a reduced number of large spawning fish was found, evidence of a change in size structure of spawning D. eleginoides. During the study period fewer later maturity stage females (including spawning stage) were observed in conjunction with increased proportions of early stage female D. eleginoides. The findings are discussed in the context of reproductive success, with consideration of the possible effects such spawning characteristics and behaviours may have on egg and larval survival. This work presents the first long-term assessment of D. eleginoides spawning dynamics at South Georgia and provides valuable knowledge for both the ecology of the species and for future fisheries management of this commercially important species.",
keywords = "Dissostichus eleginoides, fisheries management, reproduction, Shag rocks, spawning, spawning dynamics",
author = "Brigden, {K. E.} and Marshall, {C. T.} and Scott, {B. E.} and Young, {E. F.} and P. Brickle",
note = "This study was possible thanks to the generous support and funding from Georgia Seafoods Ltd. The work was carried out in association with project partners: the Government of South Georgia & the South Sandwich Islands, and the British Antarctic Survey. The authors thank the captains, crew and on-board observers involved in longline fishing and data collection at sub-area 48·3 for the period 1997–2014. Thanks are extended to I. Marengo for advising on spatial statistics; M. Soeffker for early discussions on toothfish tagging work at South Georgia which highlighted potential spawning grounds; and also to M. Belchier and P. Brewin whose comments helped improve the manuscript.",
year = "2017",
month = "7",
doi = "10.1111/jfb.13344",
language = "English",
volume = "91",
pages = "278--301",
journal = "Journal of Fish Biology",
issn = "0022-1112",
publisher = "Wiley-Blackwell",
number = "1",

}

TY - JOUR

T1 - Interannual variability in reproductive traits of the Patagonian toothfish Dissostichus eleginoides around the sub-Antarctic island of South Georgia

AU - Brigden, K. E.

AU - Marshall, C. T.

AU - Scott, B. E.

AU - Young, E. F.

AU - Brickle, P.

N1 - This study was possible thanks to the generous support and funding from Georgia Seafoods Ltd. The work was carried out in association with project partners: the Government of South Georgia & the South Sandwich Islands, and the British Antarctic Survey. The authors thank the captains, crew and on-board observers involved in longline fishing and data collection at sub-area 48·3 for the period 1997–2014. Thanks are extended to I. Marengo for advising on spatial statistics; M. Soeffker for early discussions on toothfish tagging work at South Georgia which highlighted potential spawning grounds; and also to M. Belchier and P. Brewin whose comments helped improve the manuscript.

PY - 2017/7

Y1 - 2017/7

N2 - Commercial fisheries data, collected as part of an observer programme and covering the period 1997-2014, were utilized in order to define key reproductive traits and spawning dynamics of the Patagonian toothfish Dissostichus eleginoides at South Georgia. Multi-year spawning site fidelity of D. eleginoides was revealed through the identification of previously unknown spawning hotspots. Timing of female spawning was shown to have shifted later, leading to a shorter spawning duration. A decrease in length and mass of female and male spawning fish and a reduced number of large spawning fish was found, evidence of a change in size structure of spawning D. eleginoides. During the study period fewer later maturity stage females (including spawning stage) were observed in conjunction with increased proportions of early stage female D. eleginoides. The findings are discussed in the context of reproductive success, with consideration of the possible effects such spawning characteristics and behaviours may have on egg and larval survival. This work presents the first long-term assessment of D. eleginoides spawning dynamics at South Georgia and provides valuable knowledge for both the ecology of the species and for future fisheries management of this commercially important species.

AB - Commercial fisheries data, collected as part of an observer programme and covering the period 1997-2014, were utilized in order to define key reproductive traits and spawning dynamics of the Patagonian toothfish Dissostichus eleginoides at South Georgia. Multi-year spawning site fidelity of D. eleginoides was revealed through the identification of previously unknown spawning hotspots. Timing of female spawning was shown to have shifted later, leading to a shorter spawning duration. A decrease in length and mass of female and male spawning fish and a reduced number of large spawning fish was found, evidence of a change in size structure of spawning D. eleginoides. During the study period fewer later maturity stage females (including spawning stage) were observed in conjunction with increased proportions of early stage female D. eleginoides. The findings are discussed in the context of reproductive success, with consideration of the possible effects such spawning characteristics and behaviours may have on egg and larval survival. This work presents the first long-term assessment of D. eleginoides spawning dynamics at South Georgia and provides valuable knowledge for both the ecology of the species and for future fisheries management of this commercially important species.

KW - Dissostichus eleginoides

KW - fisheries management

KW - reproduction

KW - Shag rocks

KW - spawning

KW - spawning dynamics

U2 - 10.1111/jfb.13344

DO - 10.1111/jfb.13344

M3 - Article

VL - 91

SP - 278

EP - 301

JO - Journal of Fish Biology

JF - Journal of Fish Biology

SN - 0022-1112

IS - 1

ER -