The beast of the Danube aka a monster fish

 The beast of the Danube

By Nick Thorpe BBC News, Ljubljana

 

 The Danube salmon can reach the size of a man and live for 30 years - but its last hunting grounds in the Balkans are being threatened by a rash of dam-building."It's very fast, lean, and elegant. And very beautiful," says Ulrich Eichelmann.
Read rest see photos here:

 http://www.bbc.co.uk/news/magazine-31988139

Not all large creatures are cryptids. Fish can grow to enormous size.