Rostral organ

The rostral organ of the coelacanth or similar in many other fish such as Anchovy 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]

References

M., Berquist, Rachel; L., Galinsky, Vitaly; M., Kajiura, Stephen; R., Frank, Lawrence. "The coelacanth rostral organ is a unique low-resolution electro-detector that facilitates the feeding strike". Scientific Reports. 5. doi:10.1038/srep08962. PMC 4355723.
Bemis, William E.; Hetherington, Thomas E. (1982). "The Rostal Organ of Latimeria chalumnae: Morphological Evidence of an Electroreceptive Function". Copeia. 1982 (2): 467–71. doi:10.2307/1444635. JSTOR 1444635.

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[1] M., Berquist, Rachel; L., Galinsky, Vitaly; M., Kajiura, Stephen; R., Frank, Lawrence. "The coelacanth rostral organ is a unique low-resolution electro-detector that facilitates the feeding strike". Scientific Reports. 5. doi:10.1038/srep08962. PMC 4355723.

[:0-2] Bemis, William E.; Hetherington, Thomas E. (1982). "The Rostal Organ of Latimeria chalumnae: Morphological Evidence of an Electroreceptive Function". Copeia. 1982 (2): 467–71. doi:10.2307/1444635. JSTOR 1444635.