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The Castañuela is characterized by its oval, laterally flattened body, a dark brown color, lighter on the sides and on the ventral part. Its size does not usually exceed 15 cm and it is a relatively long-lived fish, since it has a life expectancy of 15 - 18 years. The fry have a very intense cobalt blue coloration, which they lose as they grow and is barely visible once they reach maturity, except if we observe them from above, a thin intense blue line appears along the dorsal fin. Another very characteristic mark is the tail fin, strongly forked with the two elongated and black lobes.
Rocky coast and Posidonia meadows of Cabo de Palos (Murcia)