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.

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

scholarly journals Beyond the low frequency fluctuations morning and evening differences in human brain

2019 ◽  
Author(s):  
Magdalena Fafrowicz ◽  
Bartosz Bohaterewicz ◽  
Anna Ceglarek ◽  
Monika Cichocka ◽  
Koryna Lewandowska ◽  
...  
Keyword(s):  
Functional Connectivity ◽  
Resting State ◽  
Human Performance ◽  
Brain Activity ◽  
Activity Patterns ◽  
Low Frequency ◽  
Basic Mechanism ◽  
Time Of Day ◽  
Resting State Functional Connectivity ◽  
Circadian Typology

Human performance, alertness, and most biological functions express rhythmic fluctuations across a 24-hour-period. This phenomenon is believed to originate from differences in both circadian and homeostatic sleep-wake regulatory processes. Interactions between these processes result in time-of-day modulations of behavioral performance as well as brain activity patterns. Although the basic mechanism of the 24-hour clock is conserved across evolution, there are interindividual differences in the timing of sleep-wake cycles, subjective alertness and functioning throughout the day. The study of circadian typology differences has increased during the last few years, especially research on extreme chronotypes, which provide a unique way to investigate the effects of sleep-wake regulation on cerebral mechanisms. Using functional magnetic resonance imaging (fMRI), we assessed the influence of chronotype and time-of-day on resting-state functional connectivity. 29 extreme morning- and 34 evening-type participants underwent two fMRI sessions: about one hour after wake-up time (morning) and about ten hours after wake-up time (evening), scheduled according to their declared habitual sleep-wake pattern on a regular working day. Analysis of obtained neuroimaging data disclosed only an effect of time of day on resting-state functional connectivity; there were different patterns of functional connectivity between morning and evening sessions. The results of our study showed no differences between extreme morning-type and evening-type individuals. We demonstrate that circadian and homeostatic influences on the resting-state functional connectivity have a universal character, unaffected by circadian typology.

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.

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
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