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Pipefish, like seahorses, have long tubular snouts and bodies.

 

Ornate Ghost Pipefish

Don't these gorgeous little things and their feathery backdrops make you think of richly coloured oil paintings? 

 

Robust Ghost Pipefish

 

"Normal" Pipefish

 

Trumpetfish aren't really in the same group as pipefish, but I'm putting them here because they're long.

 

These razorfish are also not related to the above either, but they're long too!