Physical–biological interactions influencing large toothfish over the Ross Sea shelf

2017 ◽  
Vol 29 (6) ◽  
pp. 487-494 ◽  
Author(s):  
Julian Ashford ◽  
Michael Dinniman ◽  
Cassandra Brooks
Keyword(s):  
Life History ◽  
Recent Literature ◽  
Ross Sea ◽  
Physical Structure ◽  
Biological Interactions ◽  
Research Groups ◽  
Antarctic Toothfish ◽  
Shelf Circulation ◽  
Dissostichus Mawsoni ◽  
Competing Hypotheses

AbstractWe add comments to a recent series of publications in peer-reviewed journals concerning the distribution of large Antarctic toothfish (Dissostichus mawsoni) found over the inner shelf of the Ross Sea. We note that earlier fish ecologists advanced innovative hypotheses invoking physical–biological interactions with life history, and that these, far from being disproved, have been relegated by more immediately pressing management concerns. We argue that, despite the considerable advances achieved by research groups working onD. mawsoni, an understanding of distribution and abundance is incomplete without reference to the physical structure that supports their life history. We briefly consider hypotheses highlighted by the recent literature in the context of major features of the shelf circulation in the Ross Sea, in particular intrusions of modified Circumpolar Deep Water along trough systems. We suggest physical–biological interactions that may be involved and call for improvements in the monitoring programme that can help test between the competing hypotheses.

The Antarctic toothfish (Dissostichus mawsoni): biology, ecology, and life history in the Ross Sea region

Hydrobiologia ◽  
2015 ◽  
Vol 761 (1) ◽  
pp. 397-414 ◽  
Author(s):  
Stuart Hanchet ◽  
Alistair Dunn ◽  
Steven Parker ◽  
Peter Horn ◽  
Darren Stevens ◽  
...  
Keyword(s):  
Life History ◽  
Ross Sea ◽  
Antarctic Toothfish ◽  
Dissostichus Mawsoni ◽  
The Antarctic

scholarly journals Does large-scale ocean circulation structure life history connectivity in Antarctic toothfish (Dissostichus mawsoni)?

2012 ◽  
Vol 69 (12) ◽  
pp. 1903-1919 ◽  
Author(s):  
Julian Ashford ◽  
Michael Dinniman ◽  
Cassandra Brooks ◽  
Allen H. Andrews ◽  
Eileen Hofmann ◽  
...  
Keyword(s):  
Life History ◽  
Ocean Circulation ◽  
Early Life ◽  
Large Scale ◽  
Ross Sea ◽  
Life Stages ◽  
Lagrangian Particle ◽  
Antarctic Toothfish ◽  
Dissostichus Mawsoni ◽  
Particle Simulations

A multidisciplinary approach incorporating otolith chemistry, age data, and numerical Lagrangian particle simulations indicated a single, self-recruiting population of Antarctic toothfish (Dissostichus mawsoni) in the Southeast Pacific Basin (SPB) and Ross Sea, with a life history structured by the large-scale circulation. Chemistry deposited prior to capture along otolith edges demonstrated strong environmental heterogeneity, yet the chemistry in otolith nuclei, deposited during early life, showed no differences. Age data showed only adult fish in catches on the Pacific–Antarctic Ridge in the SPB and structuring of life stages consistent with transport pathways from the northern Ross Sea. Lagrangian particle simulations predicted that early life stages following the flow in the SPB would be transported to areas in the Ross Sea where juveniles are caught, whereas the circulation would facilitate adult movement along the shelf slope and back into the SPB where spawning adults are caught. These results suggest that successfully spawning fish spend only a part of their adult life history in the Ross Sea, areas in the eastern Ross Sea contribute disproportionately to the spawning population, and areas in the southwestern Ross Sea may supply fisheries in the southern Indian Ocean.

scholarly journals Erratum to: The Antarctic toothfish (Dissostichus mawsoni): biology, ecology, and life history in the Ross Sea region

Hydrobiologia ◽  
2015 ◽  
Vol 761 (1) ◽  
pp. 415-415
Author(s):  
Stuart Hanchet ◽  
Alistair Dunn ◽  
Steven Parker ◽  
Peter Horn ◽  
Darren Stevens ◽  
...  
Keyword(s):  
Life History ◽  
Ross Sea ◽  
Antarctic Toothfish ◽  
Dissostichus Mawsoni ◽  
The Antarctic

Monitoring Antarctic toothfish in McMurdo Sound to evaluate the Ross Sea region Marine Protected Area

2019 ◽  
Vol 31 (4) ◽  
pp. 195-207 ◽  
Author(s):  
S.J. Parker ◽  
S. Mormede ◽  
S.M. Hanchet ◽  
A. Devries ◽  
S. Canese ◽  
...  
Keyword(s):  
Protected Area ◽  
Marine Protected Area ◽  
Ross Sea ◽  
Size Composition ◽  
Antarctic Toothfish ◽  
Mcmurdo Sound ◽  
Weddell Seals ◽  
Ecological Relationships ◽  
Dissostichus Mawsoni ◽  
Northern Areas

AbstractWe developed a random, stratified, vertical longline survey in McMurdo Sound, Antarctica, to compare the local age and size composition, diet and reproductive status of Antarctic toothfish (Dissostichus mawsoni) with those observed from a vessel-based survey of the southern Ross Sea shelf that includes a McMurdo Sound stratum. Results indicated that southern McMurdo Sound toothfish were larger and older than those a short distance away in northern McMurdo Sound. These data, in addition to recoveries of tagged fish, suggest that the large toothfish in McMurdo Sound may have limited mixing with the rest of the population. The potential effects of climate change and fishing in northern areas on toothfish abundance in McMurdo Sound will depend on the mechanism of toothfish recruitment to McMurdo Sound. Understanding the ecological relationships between McMurdo Sound toothfish and the larger population is required to predict these impacts. Furthermore, because toothfish predators (type C killer whalesOrcinus orca, Weddell sealsLeptonychotes weddellii) are abundant in the south-west margins of the Ross Sea, it is important to monitor toothfish in McMurdo Sound as part of the monitoring programme for the Ross Sea region Marine Protected Area.

How precautionary is the policy governing the Ross Sea Antarctic toothfish (Dissostichus mawsoni) fishery?

2013 ◽  
Vol 26 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Peter A. Abrams
Keyword(s):  
Food Web ◽  
Ross Sea ◽  
Antarctic Toothfish ◽  
Dissostichus Mawsoni ◽  
Population Forecasts ◽  
Accurate Picture ◽  
Stock Biomass ◽  
Spawning Stock ◽  
Population Sizes ◽  
Future Population

AbstractThis article reviews the adequacy of data and models currently being used to estimate the present and future population sizes of the Antarctic toothfish (Dissostichus mawsoniNorman) in the Ross Sea regional ecosystem. The current tagging programme is unlikely to provide an accurate picture of total population size, and estimates of both the pre-exploitation spawning stock biomass and the ratio of current to pre-exploitation biomass are unreliable. Many parameters necessary for estimating future population growth or decline have not been measured, and the current objective of a 50% reduction in biomass relative to unexploited biomass may easily fail to prevent a much larger reduction from taking place. The need to guess values of important parameters makes it impossible to set bounds on the potential errors of population forecasts. Current scientific knowledge is far from what is needed to predict the likely effects of food-web responses to harvesting of toothfish in the Ross Sea, or to predict the feedback effects of those food-web changes on toothfish populations.

Age estimation and lead–radium dating of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea

Polar Biology ◽  
2010 ◽  
Vol 34 (3) ◽  
pp. 329-338 ◽  
Author(s):  
Cassandra M. Brooks ◽  
Allen H. Andrews ◽  
Julian R. Ashford ◽  
Nakul Ramanna ◽  
Christopher D. Jones ◽  
...  
Keyword(s):  
Age Estimation ◽  
Ross Sea ◽  
Antarctic Toothfish ◽  
Dissostichus Mawsoni

Biological implications of low condition factor “axe handle” specimens of the Antarctic toothfish,Dissostichus mawsoni, from the Ross Sea

2008 ◽  
Vol 20 (6) ◽  
pp. 537-551 ◽  
Author(s):  
J.M. Fenaughty ◽  
Joseph T. Eastman ◽  
Bruce D. Sidell
Keyword(s):  
Condition Factor ◽  
Ross Sea ◽  
Unit Length ◽  
Adult Life ◽  
Life History Trait ◽  
Antarctic Toothfish ◽  
Neutral Buoyancy ◽  
Dissostichus Mawsoni ◽  
The North ◽  
Lipid Stores

AbstractWe evaluated the condition factor (K), an index of weight per unit length, in a sample of 49 761 longline-caught specimens of Antarctic toothfish,Dissostichus mawsoni, from the Ross Sea. Our sample consisted of specimens from northern (60–70°S) and southern (70–78°S) regions. Fifty percent of the northern sample and 4.9% of the southern sample were large individuals with a low condition factor (Kah ≤ 1.0182) and displaying an “axe handle (ah)” morphology with a notably thinner trunk. In the northern sample 55.4% of the males and 43.2% of the females were less thanKah.In the southern region 5.3% of the males and 4.5% of the females were less thanKah. The axe handle morphology is attributable to the metabolic loss of muscular and subcutaneous lipid stores, and probably proteins, from white muscle. Our discussion considers energy metabolism as related to migration, feeding and reproduction. We suggest that migration, a life history trait of the phyletically basal notothenioid cladesPseudaphritisandEleginops, persists inD. mawsoni. The spawning migration from the southern shelf to ridges and seamounts in the north may reflect fidelity to historic spawning grounds. As evidenced by the axe handle specimens neutral buoyancy of largeD. mawsonimay be ephemeral, fluctuating over the course of adult life.

Diet of Antarctic toothfish (Dissostichus mawsoni) from the continental slope and oceanic features of the Ross Sea region, Antarctica

2014 ◽  
Vol 26 (5) ◽  
pp. 502-512 ◽  
Author(s):  
Darren W. Stevens ◽  
Matthew R. Dunn ◽  
Matthew H. Pinkerton ◽  
Jeff S. Forman
Keyword(s):  
Continental Slope ◽  
Diet Composition ◽  
Ross Sea ◽  
Fish Diet ◽  
Antarctic Toothfish ◽  
Fish Prey ◽  
Dissostichus Mawsoni ◽  
Antimora Rostrata ◽  
Benthic Fishes ◽  
Important Fish

AbstractThe diet of Dissostichus mawsoni captured by bottom longline in the Ross Sea region was examined during 2003, 2005 and 2010. The diet of sub-adult toothfish was similar to adult toothfish, comprising mainly benthic fishes and cephalopods. Sub-adult toothfish ate a greater variety of smaller prey than adults, including smaller fish and prawns. Grenadiers (Macrourus spp.) were the most important fish and overall prey species. On the continental slope, icefish (Channichthyidae) and eel cods (Muraenolepididae) were also important fish prey, while Psychroteuthis glacialis was the most important cephalopod prey. On oceanic features, toothfish fed mainly on Macrourus spp. but also fed on Antimora rostrata, cephalopods and the occasional mesopelagic to epipelagic fish. Diet varied significantly with toothfish size and location on northern parts of the Mawson and Iselin banks of the Ross Sea continental slope. There was no significant temporal change in diet composition.

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