A species is a group of organisms capable of mating and producing offspring. This is another way of saying that a species is reproductively isolated.
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Ancistrus is a genus of nocturnal freshwater fish in the family Loricariidae of order Siluriformes, ... Historically, commonly available species of Ancistrus were Ancistrus cirrhosus and Ancistrus temminckii; other species are now available, though .
Explanation:
Hope it helps
I’m thinking light because it doesn’t have anything to do with aquatic organisms.