jan 1, 350 BC - Aristotélēs

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§ 17 8.13.5 The way of accounting for this phenomenon is that this fish, and this one only, swims northwards into the Danube, and then at the point of its bifurcation swims down southwards into the Adriatic. And, as a proof that this theory is correct, the very opposite phenomenon presents itself in the Adriatic; that is to say, they are not caught in that sea during their entry, but are caught during their exit (Aristotle, History of Animals, 8.13.5)

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