Originating from or produced by the gills, or describing something that arises from gill tissue.
From Greek 'branchia' (gill) + '-genous' (from 'genos', origin or generation). The suffix indicates origin or production, used in biology to describe gill-derived structures.
Some fish diseases are branchiogenous—starting in the gills and spreading through the system, which is why fish farmers monitor gill health obsessively.
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