1. Australian Antarctic Data Centre
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4. ASAC_865

Description

This study investigated distribution patterns of pelagic fish, larvae and juveniles collected by RMT trawls during ANARE's BROKE survey to CCAMLR Division 58.4.1 (80 degrees to 150 degrees E and from the Antarctic continent to 55 degrees S).

After the BROKE-West survey of 2006, the original BROKE survey was renamed BROKE-East.

The project attempted to explain these patterns in terms of dietary factors and tolerance to different thermohaline regimes. Nearly 2000 individuals, weighing 1210 g, were collected, from approximately 1.5 million m3 of the upper 200 m of ocean, supporting the theory that Antarctic ichthyoplankton has low biomass. The collection consisted mainly of P. antarcticum larvae and juveniles and E. antarctica sub-adults, with a range of other notothenioid fish and myctophids. Three distinct biogeographic zones, with characteristic ichthyo- and zooplankton assemblages were identified. The Oceanic Zone was dominated by myctophids and, in the western reaches, the paralepidid N. coatsi. The Shelf Break Zone was comprised mainly of myctophids, and the juveniles of notothenioid fish. The Shelf Zone consisted of notothenioid juveniles and sub-adults. Characteristic water masses and associated zooplankton assemblages were found throughout these three zones. Analysis of fish stomach con tents indicated feeding on locally abundant zooplankton taxa. There was niche-partitioning of prey taxa and size-classes, between both sympatric species and between different ontogenetic stages. Fish distributions corresponded to known patterns, and extended the known geographic range of several species.

The fields in this dataset are:
Station
Longitude
Latitude
Trawl Number
Maximum depth fished
Number of Fish taxa
Total number of individuals
Total mass
Fish taxa present
Number of individuals
Mean standard Length
Mass of species
Water volume filtered
Fish Species
Stomachs examined
Prey taxon
Frequency of occurrence (%)
Number of items
Mass of items
% by number
% by mass
% by mass * % by volume

Access

These data are publicly available for download from the provided URL. Data also published to GBIF, OBIS and SCAR-MarBIN.

Temporal Coverages

• Start date: 1996-01-19 - Stop date: 1996-03-31

Spatial Coverages

Science Keywords

• EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > FISH
• EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PELAGIC
• EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > POPULATION DYNAMICS
• EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > CONSUMPTION RATES
• EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > COMMUNITY DYNAMICS > COMMUNITY STRUCTURE

Use Constraints

This data set conforms to the CCBY Attribution License
(http://creativecommons.org/licenses/by/4.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_865 when using these data.