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Rhinobatos lentiginosus
Guitarfishes have a body form intermediate between those of sharks and rays. The tail has a typical shark-like form, but in many species the head has a triangular, or guitar-like shape, rather than the disc-shape formed by fusion with the pectoral fin found in other rays. (Wikipedia) The guitarfish are a family, Rhinobatidae, of rays.
Tropicarium of Budapest; In the wilde: Atlantic and IndoPacific, mainly a the tropical coasts.
I was walking through the aquarium through a glass tunnel and could catch this smiling fish just from below. About 1,5m long.