tubercle
A small, rounded, epidermal projection or protuberance present on the head, body, or fins of some fishes. Often developing temporarily during the spawning season and/or in males only.
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Ichthyological terms, not general ones.
breeding tubercle
Raised, epidermal structures developing on the head, body or fin rays during the spawning season in some fishes. Usually occur only in males, and sometimes referred to as 'nuptial tubercules'.