Johannes Schmidt (biologist)

Ernst Johannes Schmidt (2 January 1877 – 21 February 1933) was a Danish biologist credited with discovering in 1920 that eels migrate to the Sargasso Sea to spawn. Before this people in North America and Europe had wondered why there were no baby eels where they were fishing.

Schmidt began his studies of natural history at the University of Copenhagen under professor of botany Eugen Warming and obtained an MS degree in 1898. He obtained a grant from the Carlsberg Foundation to study the flora of the coastal areas of Ko Chang in then Siam, including both mangrove trees and microalgae. He made his doctoral thesis on shoot architecture of mangrove trees and Eugen Warming served as faculty opponent in October 1903.

Schmidt then more or less switched to marine zoology, working 1902–1909 part-time for the Botanical Institute of the University of Copenhagen, part-time for the Danish Commission for Investigation of the Sea. In 1909, he was made head of the department of physiology at the Carlsberg Laboratory, a post he held until his early death.

Schmidt worked in parallel on phycology, where he described the genus Richelia (filamentous heterocyst-forming Cyanobacteria dwelling inside diatoms), on plant physiology and genetics, especially of hops, and on large-scale oceanography and ichthyology. In 1928–1930, he led the Dana Expedition, funded by the Carlsberg Foundation, being a two-year voyage around the world's oceans. The discovery of the spawning place of the eel was one of the results of this expedition.

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