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There are both styles out there called bait pumps. But really you do not need a bait pump, you just need a pump made to run all the time that creates enough flow for your situation.
Ones that look like a washdown pump are low flow high pressure (ie 45 PSI, 5 GPH might be a rating you'd see).. These are self priming and typically I think diaphragm driven, however some of the nicer ones can be flexible impeller driven too.
And ones that look like a bilge pump with special fittings (ie a rating you would see is 1200 GPH). These are hard impeller driven, like a bilge pump. The motors are smaller and they draw less juice, but do not pump at a guaranteed rate and generally are more cheaply built. This is typically what folks run but not necessarily the best depending on livewell size and the way the plumbing works (ie airlock, low flow if there is pressure involved in getting to the tank).
Jon
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