Seabird mortality associated with Patagonian Toothfish (Dissostichus eleginoides) longliners in Falkland Islands waters

2004 ◽  
Vol 104 (4) ◽  
pp. 317-325 ◽  
Author(s):  
T. A. Reid ◽  
B. J. Sullivan ◽  
J. Pompert ◽  
J. W. Enticott ◽  
A. D. Black
Keyword(s):  
Falkland Islands ◽  
Patagonian Toothfish ◽  
Dissostichus Eleginoides

Behavioural observations on the scavenging fauna of the Patagonian slope

1999 ◽  
Vol 79 (6) ◽  
pp. 963-970 ◽  
Author(s):  
Martin A. Collins ◽  
Cynthia Yau ◽  
Conor P. Nolan ◽  
Phil M. Bagley ◽  
Imants G. Priede
Keyword(s):  
Soft Tissues ◽  
Deep Ocean ◽  
Rapid Response ◽  
The Other ◽  
Falkland Islands ◽  
Antimora Rostrata ◽  
Consumption Rates ◽  
Patagonian Toothfish ◽  
Primary Consumers ◽  
Dissostichus Eleginoides

The scavenging fauna of the Patagonian slope (900–1750 m), east of the Falkland Islands was investigated using the Aberdeen University Deep Ocean Submersible (AUDOS), an autonomous baited camera vehicle designed to photograph scavenging fish and invertebrates. The AUDOS was deployed on ten occasions in Falkland waters. Nine experiments were of 10–14 h duration and baited with 800 g of squid and one experiment lasted six days, baited with a 10 kg toothfish (Dissostichus eleginoides). Analysis of photographs revealed considerable patchiness in the composition of the scavenging fauna. Hagfish (Myxine cf. fernholmi) dominated three of the shallower experiments including the 6-d experiment, arriving quickly from down-current, holding station at the bait and consuming the soft tissues first, with consumption rates of up to 200 g h−1. In the other experiments, stone crabs (Lithodidae), the blue-hake (Antimora rostrata) and amphipods were the primary consumers, but the rate of bait consumption was lower. Patagonian toothfish (D. eleginoides) were attracted to the bait at each experiment, but did not attempt to consume the bait. The patchiness in the fauna may be a result of depth, substratum and topography, but in general the rapid response of the scavenging fauna indicates that carrion is rapidly dispersed, with little impact on the local sediment community.

The parasite fauna of the Patagonian toothfish Dissostichus eleginoides off the Falkland Islands

2012 ◽  
Vol 87 (4) ◽  
pp. 501-509 ◽  
Author(s):  
J. Brown ◽  
P. Brickle ◽  
B.E. Scott
Keyword(s):  
Seasonal Changes ◽  
Parasite Species ◽  
Parasite Fauna ◽  
Falkland Islands ◽  
Fish Parasite ◽  
North West ◽  
The North ◽  
Patagonian Toothfish ◽  
Dissostichus Eleginoides ◽  
Seasonal Data

AbstractThe parasite fauna of juvenile Dissostichus eleginoides, while they inhabit the Falkland's shelf, was examined, giving new detailed information on spatial, ontogenic and seasonal variations. A total of 24,943 parasites from 15 different taxa were found in the stomach of 502 individual fish. Parasite species composition and abundance allowed separation of toothfish by area between the north-west and south-east of the Falklands. The digenean, Elytrophalloides oatesi, and the nematodes, Hysterothylacium spp. and Anisakis spp., were the most common, all with a prevalence >20%. For some seasons ontogenic changes in abundance were significant in these three parasite taxa, and this is discussed in terms of ontogenic and seasonal changes in diet. Elytrophalloides oatesi and Hysterothylacium spp. showed spatial and seasonal differences in abundance with greater numbers in the warmer waters of the north-west and during the summer months. Differences in abundance of E. oatesi between the Falklands and other regions indicate its potential for use as a biological tag to study toothfish movements and population structure; however, more seasonal data would be required before this technique could be used.

Vitellogenesis in the Patagonian toothfish (Dissostichus eleginoides) conditioned to a recirculating aquaculture system

2021 ◽  
Vol 307 ◽  
pp. 113768
Author(s):  
Rodolfo Amthauer ◽  
Francisca Cárdenas ◽  
Alberto Reyes ◽  
Ariel Valenzuela ◽  
Patricio Dantagnan ◽  
...  
Keyword(s):  
Recirculating Aquaculture System ◽  
Recirculating Aquaculture ◽  
Aquaculture System ◽  
Patagonian Toothfish ◽  
Dissostichus Eleginoides

Diet of Patagonian toothfish (Dissostichus eleginoides) around Macquarie Island, South Pacific Ocean

2002 ◽  
Vol 53 (1) ◽  
pp. 49 ◽  
Author(s):  
S. D. Goldsworthy ◽  
M. Lewis ◽  
R. Williams ◽  
X. He ◽  
J. W. Young ◽  
...  
Keyword(s):  
Low Frequency ◽  
Time Of Day ◽  
Fishing Ground ◽  
Fish Prey ◽  
Macquarie Island ◽  
South Pacific Ocean ◽  
Important Prey ◽  
Patagonian Toothfish ◽  
Myctophid Fish ◽  
Dissostichus Eleginoides

A total of 1423 stomach samples were taken from Patagonian toothfish, Dissostichus eleginoides, caught by bottom trawls at two fishing grounds near Macquarie I., over three fishing seasons. Fish were caught at depths ranging from 500 to 1290 m, and ranged in size from 310 to 1490 mm total length. The 462 stomach samples (32%) that contained prey items indicated that toothfish preyed on a broad range of species including fish, cephalopods and crustaceans (58%, 32% and 10% biomass, respectively), suggesting that they are opportunistic predators. The bathypelagic fish Bathylagus sp. was the most important fish prey (14% dietary biomass); however, nototheniid, macrourid, morid and myctophid fish were also taken. The squid Gonatus antarcticus was also an important prey species (16% biomass), and many other cephalopod species were taken in low frequency. Prawnlike crustaceans (Nematocarcinidae, Mysididae, Sergestidae and Euphausiidae) were the most important crustaceans taken (9% of prey biomass). Significant inter-seasonal and inter-fishing-ground differences in diet were found, but dietary composition was not related to fishing depth, fish size (with the exception of one fishing ground in one season) or the time of day of capture. Comparison with other studies reveals biogeographical differences in the diet of toothfish.

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