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There have been varieties of goldfish developed that do not have a dorsal fin but in nature, I believe all fish have a dorsal fin. Of course there could be a species or two that have evolved without one but if so I am unaware of them.

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15y ago
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12y ago

no the common fishes do but the special and specific fishes don't.

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No. Hagfishes and lampreys don't have any paired fins. Nor do spiny eels.

Some others are:

Order Gymnotiformes: South American knifefishes.

Family Syngnathidae: Sea horses and some pipefishes

Flabby whalefishes

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Q: Do all fish have pelvic fins?
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