Rostral organ
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The rostral organ of the coelacanth or other fish is a large gel-filled cavity in the snout, with three pairs of canals to the outside.[1]
It is surrounded by an insulating layer of adipose tissue and innervated by the superficial ophthalmic nerve. Its anatomy and innervation suggest it is an electroreceptive organ[2] used for finding prey in the dark. This is supported by experiments which showed that coelacanths react to electrical fields produced by a submersible.[2]