Biological Investigations of Marine Antarctic Systems and Stocks (BIOMASS) is a program whose principal objective was to gain a deeper understanding of the structure and dynamic functioning of the Antarctic marine ecosystem as a basis for the future management of potential living resources. BIOMASS has two major field campaigns, the First (FIBEX) and Second (SIBEX) International BIOMASS Experiments.
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The goal of FIBEX was to determine how much krill is in the Antarctic. It was composed of 16 research cruises carried out between November 1980 and April 1981, and produced a synoptic picture of the distribution of krill over a large area of the Southern Ocean. The goal of SIBEX was to improve the understanding of the dynamics of the krill–dominated part of the Antarctic marine ecosystem. It involved two field seasons, SIBEX–1 (8 cruises, Oct. 1983 to Apr. 1984) and SIBEX–2 (ten cruisesL November, 1984 to April, 1985), and produced a temporal sequence of observations focused mainly on the Bransfield Strait and Prydz Bay regions.