Modelling spatial distribution of Patagonian toothfish through life-stages and sex and its implications for the fishery on the Kerguelen Plateau

Péron, Clara; Welsford, Dirk; Ziegler, Philippe E.; Lamb, Timothy D.; Gasco, Nicolas; Chazeau, Charlotte; Sinegre, R; Duhamel, Guy

doi:10.1016/j.pocean.2015.12.003

Cited by 35 publications

(30 citation statements)

References 48 publications

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“…Across the Kerguelen Plateau spawning occurs at 1700–1900 m (Welsford et al, ), with the suggestion that deep‐water spawning on the plateau could enhance egg and larval retention at the most productive areas (M. Mori, unpubl. data; Park et al, ; Péron et al, ).…”

Section: Discussionmentioning

confidence: 92%

Interannual variability in reproductive traits of the Patagonian toothfishDissostichus eleginoidesaround the sub‐Antarctic island of South Georgia

Brigden

Marshall

Scott

et al. 2017

Journal of Fish Biology

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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.

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Section: Discussionmentioning

confidence: 92%

Interannual variability in reproductive traits of the Patagonian toothfishDissostichus eleginoidesaround the sub‐Antarctic island of South Georgia

Brigden

Marshall

Scott

et al. 2017

Journal of Fish Biology

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“…Hence a shift in sampling towards deeper habitats potentially occupied by earlier-maturing fish could contribute to the temporal shift in age at maturity reported here. The issue of spatial and temporal segregation of mature spawning fish away from the juvenile (Péron et al, 2016) and resting population and the potential for sampling biases influencing estimates of size at maturity, has been also noted D. mawsoni (Parker & Grimes, 2010).…”

Section: Discussionmentioning

confidence: 97%

“…Although the productive shallow plateau waters at HIMI may provide attractive foraging opportunities for larger fish (Améziane et al, 2011;Welsford et al, 2011;Park et al, 2014), spawning in deeper slope environments may provide greater benefits via reduced predation pressure from elephant seals Mirounga leonina and sperm whales Physeter microcephalus, which generally forage in depths of <1000 m (Watwood et al, 2006;McIntyre et al, 2011). Furthermore, recent hydrodynamic modelling revealed that spawning on deep western slopes at HIMI could enhance the retention of eggs and larvae over the shallow Plateau, thereby enhancing offspring fitness and survival (Mori et al, 2016;Péron et al, 2016). There is evidence in this study that important spawning habitats may extend further south into the Australian EEZ than previously thought and that they may also occur on the slopes south of HIMI.…”

Section: Discussionmentioning

confidence: 99%

“…Fishing for D. eleginoides at HIMI in the Australian EEZ started in 1997 as a trawl fishery operating in depths <1000 m and catching fish predominantly <800 mm total length ( L T ). The use of longlines was introduced in 2003 and gradually increased in following years to be the current primary fishing method (Constable & Welsford, ; Péron et al , ). The transition from trawl to longline fishing has allowed fishing across a broader range of depths and locations, thereby influencing the catch composition of D. eleginoides (Welsford et al , ; Péron et al , ).…”

Section: Introductionmentioning

confidence: 99%

“…1), which encompasses an Australian exclusive economic zone (EEZ) around Heard Island and the McDonald Islands (HIMI) and a French EEZ around the Kerguelen Islands (Williams & de la Mare, 1995;Duhamel & Hautecoeur, 2009). Dissostichus eleginoides occupy a broad depth range from 10 m to over 2500 m, with an ontogenetic habitat shift towards deeper waters as fish grow older (Agnew et al, 1999;Arkhipkin et al, 2003;López Abellán, 2005;Arkhipkin & Laptikhovsky, 2010;Péron et al, 2016). As a result of this broad depth distribution, the Kerguelen Plateau represents a large expanse of contiguous habitat for D. eleginoides (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Spatio‐temporal dynamics in maturation and spawning of Patagonian toothfish Dissostichus eleginoides on the sub‐Antarctic Kerguelen Plateau

Yates

Ziegler

Welsford

et al. 2018

Journal of Fish Biology

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This study investigated maturation and spawning of Patagonian toothfish Dissostichus eleginoides in the Heard Island and McDonald Islands (HIMI) fishery on the Kerguelen Plateau in the Indian Sector of the Southern Ocean based on gonads and otoliths collected between 2004 and 2015 and using histological analyses and calibration of macroscopic staging criteria. Dissostichus eleginoides at HIMI spawn throughout the austral late autumn and winter months of May-August and spawning activity is concentrated on slopes along the west and south of the plateau around HIMI at depths of 1500-1900 m. Comparison between histological analyses and macroscopic gonad staging indicated that many fish that had spawned, as indicated by the presence of post-ovulatory follicles, returned to a resting stage which was macroscopically indistinguishable from maturing fish. Furthermore, the occurrence of females of all size classes with low gonado-somatic index and low macroscopic gonad stage during the spawning season suggested that a proportion of mature females did not spawn every year. Age-at-maturity estimates, based on the assumption that fish of macroscopic stages ≥2 were mature, decreased between the 2004-2009 and 2010-2015 periods for both sexes. The magnitude of this temporal variation in age at maturity, however, varied between gear types and fishing depths and variable sampling regimes probably influenced these variations. This study highlights the importance of correct interpretation of macroscopic gonad stages and understanding the influence of fishery operations on estimations of life-history parameters.

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Sex analysis in marine biological systems: insights and opportunities

Gissi

Schiebinger

Santoleri

et al. 2023

Frontiers in Ecol & Environ

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The ocean is facing unprecedented challenges due to the escalating impacts of climate change and other pressures threatening ecosystems and the many benefits they provide. Effective strategies for reversing the loss of biodiversity rely on knowledge of how marine organisms, populations, and communities respond to environmental change. A fundamental but often overlooked biological characteristic of organisms is sex, which is distinct from sociocultural gender. Here, we examined how sex influences marine organisms, populations, and communities, through a review of sex analysis applications in marine biological research. We found that sex broadly affects the morphology, physiology, behavior, and distribution of organisms and populations across taxa, with evidence of sex‐specific differences in survival to thermal stress, timing of biological mechanisms, and energetics. To facilitate further integration of sex into marine biological research, we synthesize current approaches, discuss methodological and logistical challenges, and lay out guidelines for future research.

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Modelling spatial distribution of Patagonian toothfish through life-stages and sex and its implications for the fishery on the Kerguelen Plateau

Cited by 35 publications

References 48 publications

Interannual variability in reproductive traits of the Patagonian toothfishDissostichus eleginoidesaround the sub‐Antarctic island of South Georgia

Interannual variability in reproductive traits of the Patagonian toothfishDissostichus eleginoidesaround the sub‐Antarctic island of South Georgia

Spatio‐temporal dynamics in maturation and spawning of Patagonian toothfish Dissostichus eleginoides on the sub‐Antarctic Kerguelen Plateau

Sex analysis in marine biological systems: insights and opportunities

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