Nella Dan: FIBEX Cruise - Zooplankton data
During the second half of the cruise the use of the conical nets were discontinued. This cruise provides data from the first of six cruises, which provides a good coverage of the area over varying seasons and conditions. Data collection: Three net types were used for the collection of species; recta...
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| Format: | Dataset |
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Australian Ocean Data Network
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| Online Access: | https://researchdata.edu.au/nella-dan-fibex-cruise-zooplankton/685160 https://data.aad.gov.au/metadata/records/FIBEX_zoo https://data.aad.gov.au/eds/1178/download https://data.aad.gov.au/eds/2540/download https://data.aad.gov.au/aadc/biodiversity/display_collection.cfm?collection_id=156 https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=FIBEX_zoo |
| Summary: | During the second half of the cruise the use of the conical nets were discontinued. This cruise provides data from the first of six cruises, which provides a good coverage of the area over varying seasons and conditions. Data collection: Three net types were used for the collection of species; rectangular midwater trawl (RMT8), bongo nets, and conical nets. Routine stations were taken as close to solar midday and midnight. At each station a 'blind' MT horizontal haul at a nominal depth of 62m, an oblique bongo tow from a notional 200 m to the surface, a horizontal surface tow, and a vertical tow with conical nets were taken. Conical surface tows and vertical tows were discontinued in the second half of the cruise due to problems. Ship-board processing: The entire catch was weighed as accurately as possibly immediately it was onboard, and large specimens (medusae etc.) were also individually weighed. Euphausia superba were separated, and the remainder of the catch was sorted into major groups, eg. pteropods, fish, etc., and preserved. A random sample of at least 200 Euphausia superba were, measured, sorted for sex and maturity stage and preserved as a separate sample. The remaining Euphausia superba was either frozen or preserved. Post-ship processing: The catches were sorted into individual species, weighed and counted. Consistency can be established through comparison of different net methods. Oceanography and phytoplankton data were also collected at the net sampling stations, so there is consistency between the oceanography and biology data. The cruise track was established at the beginning of the expedition to eliminate any bias, and was followed as closely as weather and ice conditions allowed. Stations were taken as close as possible to solar midday and midnight. See the attached documentation for more information. This dataset contains results from the First International BIOMASS Experiment (FIBEX) cruise of the Nella Dan. It is the first cruise in a series of six designed to assess the distribution and abundance of krill, Euphausia superba. The FIBEX was an international programme co-ordinating the activities of 12 ships from 11 nations in the Southern Atlantic and Indian Oceans. Australia was responsible for surveying an area of the southern Indian Ocean south of 60 degrees and between 60 degrees and 90 degrees east longitude. Surveys of krill and other zooplankton were taken off Antarctica in the Australian sector (Mawson to Davis region) and Prydz Bay in January and March 1981. Species identity and abundance data were obtained. The major species investigated were Euphausia superba, Euphausia frigidia, Euphausia crystallorophias and Thysanoessa marcuria. Other pteropods and cephalopods were also studied. Physical and chemical oceanography data and phytoplankton samples were also obtained, as well as results from hydroacoustic surveys of krill biomass. Several files are available for download at the provided URL. They include excel spreadsheets on summarised data, catch composition data and station lists. Furthermore a pdf document of the report produced from the cruise is also available for download. The fields in this dataset are: Date Time (GMT) Type of Trawl Species Weight Number Latitude Longitude Haul Number Towing Speed (knots) Water Depth (metres) Sea Temperature Target Levels Net Open Time Net Close Time Ice Station Number Flowmeter Reading Towed Distance (nautical miles) Catch Weight (grams) Fishing Start Time Fishing End Time Trajectory Depth Range Top Depth Range Bottom Comments These data are also available via the biodiversity database at the provided URL. 61 taxa and 1,115 observations are present in the biodiversity database collection. |
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