Stock Photo - 17 August 2018, Germany, Bremerhaven: An employee of the Thünen-Institute for Fishery Ecology, works in the institute in the room with the swimming tunnels. Among other things, the swimming behaviour of European eels is being investigated there. Photo: Carmen Jaspersen/dpa. - Bremerhaven/Bremen/Germany

Stock Photo: 17 August 2018, Germany, Bremerhaven: An employee of the Thünen-Institute for Fishery Ecology, works in the institute in the room with the swimming tunnels.

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