Experimental studies into growth and ageing of krill 1993-2003

• Other Authors: Australian Antarctic Division (isOwnedBy)
• Format: Dataset
• Language: unknown
• Published: data.gov.au
• Subjects: AMD; AREA; CEOS; CRUISE; DATE; DEAD KRILL; EXPERIMENT ID; FIELD SEASON; GROWTH; KRILL; LABORATORY; LATITUDE; LENGTH; LONGITUDE; MONTH; MOULTED KRILL; SAMPLE; SEX; SHIPS; SOUTHERN OCEAN; STATION; TRAWL; UROPOD SIZE; Antarctic; Indian; Southern Ocean; Antarc*; Antarctic Krill; Euphausia superba
• Online Access: https://researchdata.edu.au/experimental-studies-growth-1993-2003/1941222; http://data.gov.au/dataset/3519e165-d4a2-4551-93ae-1ba530bfcf34

Metadata record for data from ASAC Project 2337 See the link below for public details on this project.\n \n --- Public Summary from Project --- \nThe experimental krill research program is focused on obtaining life history information of use in managing the krill fishery - the largest Antarctic fishery. In particular, the program will concentrate on studies into schooling, growth and ageing of krill.\n \nFrom the abstracts of some of the referenced papers:\n \nNucleic acid contents of tissue were determined from field-caught Antarctic krill to determine whether they could be used as an alternative estimator of individual growth rates which can currently only be obtained by labour intensive on-board incubations. Krill from contrasting growth regimes from early and late summer exhibited differences in RNA-based indices. There was a significant correlation between the independently measured individual growth rates and the RNA-based indices. There was a significant correlation between the independently measured individual growth rates and the RNA:DNA ratio and also the RNA concentration of krill tissue, although the strength of the relationship was only modest. DNA concentration, on average, was relatively constant, irrespective of the growth rates. The moult stage did not appear to have a significant effect on the nucleic acid contents of tissue. Overall, the amount of both nucleic acids varied considerably between individuals. Nucleic acid-based indicators may provide information concerning the recent growth and nutritional status of krill and further experimentation under controlled conditions is warranted. The are, however, reasonably costly and time-consuming measurements.\n \nGrowth rates of Antarctic krill Euphausia superba Dana in the Indian Ocean sector of the Southern Ocean were measured in 4 summers. Growth rate was measured using an 'instantaneous growth rate' technique which involved measuring the mean change in length if the uropods at moulting. In the first 4 days following collection mean growth ...