black chin

black chin
a condition seen in aquarium cichlids, particularly those from the African Great Lakes, where the chin develops small grey-black spots or blotches which may spread back to the pelvic fins. May be related to high nitrate as the species involved are from low nitrate habitats (aquaria with nitrate <20 p.p.m. generally avoid this problem)

Dictionary of ichthyology. 2009.

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