[1] He indulged his interest in natural history while studying medicine; having collected water fleas in local lakes with Wilhelm Lilljeborg's works, he discovered new species, and this resulted in his first scientific publication.
[1] Georg Ossian Sars had a good memory and excellent drawing skills, and illustrated some of his father's zoological works.
One of his first discoveries was that the eggs of cod are pelagic, that is, they inhabit the open water column.
He described many new species in his career, including in his magnum opus, An Account of the Crustacea of Norway.
[1] For his achievements, Sars was made a Knight of the Order of St. Olav in 1892, and elevated to Knight-Commander in 1911.