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Antarctic krill (Euphausia superba Dana) is a key species of the Southern Ocean ecosystem, immensely abundant and targeted by the krill fishery. For their sustainable management, krill distribution and biomass estimates are required, typically achieved through acoustic-trawl surveys.
Allocation of energy is as important as energy uptake for maintaining healthy life cycles and sustainable populations of krill. Environmental factors such as temperature and food availability play important roles in the physiological performance of krill.
Bdelloid rotifers are an important component of the biodiversity of ice-free regions of Antarctica. Despite this, knowledge of how to establish and maintain cultures, and optimal conditions for growth, is limited.
Population monitoring provides information on species conservation status. We reassess the status of the southern elephant seal population at Macquarie Island. The number of cows on the isthmus, ~20% of the total population, correlated with counts for the whole island (i.e.
Vertical migrations by marine organisms contribute to carbon export by consumption of surface … phytoplankton followed by defecation in the deep ocean. However, biogeochemical models lack … observational data, leading to oversimplified representation of carbon cycling by migrating organisms…
The East Antarctic krill fisheries are spread across two Divisions of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR), Division 58.4.1 between 80-150°E and Division 58.4.2 between 30-80°E.
Southern Ocean phytoplankton form the base of the Antarctic food web, influencing higher trophic levels through biomass and community structure.
The Southern Ocean, its ecosystem, and inhabitants are vulnerable to climate-mediated shifts in habitat conditions. These changes can affect marine predators in the long term through changes in the distribution, density, and quality of prey.
Here, we present the Grym package (Wotherspoon and Maschette, 2020). Designed to work within R (R Core Team, 2020), the Grym was built with the aim to provide a toolbox of functions that replicate the existing core functionality of the GYM software (compiled version 501E; Constable, 2004).
The Commission for the Conservation of Antarctic Marine Living Resources has recently decided to re-adopt the generalised yield model (GYM) as an assessment tool to progress the management of Antarctic krill (Euphausia superba). To this end…
The Antarctic marginal ice zone (MIZ) is a highly dynamic region where sea ice interacts with ocean surface waves generated in ice-free areas of the Southern Ocean. Improved large-scale (satellite-based) estimates of MIZ extent and variability are crucial for understanding atmosphere–ice…
Antarctic krill are a fundamental component of Southern Ocean ecosystems and perturbations to krill populations have ramifications for the entire ecosystem. Krill are fished across the Southern Ocean and sustainable management of this fishery is a high priority for the Australian Government.
Individual life-history traits, such as age and sex, influence vital rates in most large vertebrate species. Developmental differences are especially profound in polygamous mating systems. One of the most polygamous of all mammals, the southern elephant seal (Mirounga leonina)…
Following the request by WG-SAM-2021 (SC-CAMLR 2021a, para. 10.3) and the presentation of the preliminary krill stock assessment in Maschette et al. (2021a; 2021b) to WG-FSA-2021 (SC-CAMLR 2021b, paras. 5.8 - 5.13)…
Minimising seabird interactions with longline operations is a key objective of the management of fisheries in CCAMLR (see e.g. Conservation Measure CM 25-02 and 41-08). Longline fishing in the fishery for Patagonian toothfish (Dissostichus eleginoides) in Statistical Division 58.5.
Fisheries are human activities that alter resource availability for species in marine ecosystems. While fisheries remove fish biomass, they may also provide new feeding opportunities to various marine predators. These species, depredating on catches directly on the fishing gear…
To manage a fishery effectively, it is crucial to understand the spatial stock structure of the target species, and how fishing mortality is distributed across the stock. This study investigates the genetic stock structure of Antarctic toothfish (Dissostichus mawsoni)…
Publication: 2019. Final Report, FRDC Project 2017/021. Australian Antarctic Division and the Fisheries Research and Development Corporation. Kingston, Australia. ISBN 978-1-876934-33-0. For this study, Antarctic toothfish samples were collected from CCAMLR Subareas 48.2, 48.4, 48.6, 88.1, 88.
Catch rates or catch per unit of effort (CPUE) are used for data-poor exploratory fisheries without integrated assessments in the CPUE by seabed area method to estimate stock biomass in the interim of collecting sufficient tag recaptures. Here, we address the two questions: (1)…
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Recommendations … We recommend the catch limits in Conservation Measure 42-02 be set at 1528 t in the 2021/22 season and 1138 t in the 2022/23 season. Abstract … The annual random stratified trawl survey was undertaken in Division 58.5.
Recommendations … When modelling multiple fleets in a GYM assessment, we recommend the use of the presented extension to the Grym package based on its shown capacity to model more complex fisheries and fishing practices with a high degree of consistency in results.
Antarctic polynyas are persistent open water areas which enable early and large seasonal phytoplankton blooms. This high primary productivity, boosted by iron supply from coastal glaciers, attracts organisms from all trophic levels to form a rich and diverse community.
Antarctic krill (Euphausia superba) is a keystone species of the Southern Ocean, vastly abundant and an essential food source of some of the Southern Ocean's most charismatic predators, including penguins, seals, and baleen whales. Antarctic krill are also targeted by a krill fishery…