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Do all sea creatures that have scales have to have fins?

Do we know of any sea creatures that have only scales without fins?

I'm especially interested in fish that have scales but no fins.

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up vote 2 down vote accepted

How about marine reptiles? Sea snakes have a paddle-like tail, so perhaps you would claim that as a fin, but maybe marine iguanas would qualify? And, of course, sea turtles.

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Thanks Alan. Maybe you know of fish that answer the criterion? –  MichaelS Oct 28 '12 at 16:07
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Definitely not. Since the tail is the caudal fin, this hypothetical finless fish would have no means of locomotion. –  Alan Boyd Oct 28 '12 at 16:44
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