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How to identify a fish

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@robot
Published in 
Nature
 · 5 months ago
How to identify a fish
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Case 1: 5 gill openings laterally on either side of head or body

How to identify a fish
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Case 1a: anal fin absent

How to identify a fish
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Case 1b: anal fin present

How to identify a fish
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Case 2: 6-16 gill openings on either side of head or body, sometimes tiny

How to identify a fish
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Case 3: 5 pairs of gill openings on underside of head

How to identify a fish
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Case 4: one gill opening on either side, sometimes tiny, or only single opening on throat

How to identify a fish
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