Ray-finned Fish (Class Actinopterygii) are a subclass of bony fish defined by having fins that are comprised of webs of skin supported by bony or horny spines ("rays"), as opposed to the fleshy, lobed fins that characterize the lobe-finned fish (class Sarcopterygii).

They are ubiquitous throughout freshwater and marine environments from the deep sea to the highest mountain streams.

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