Alex Mustard / Close up portrait of female Lionfish (Pterois volitans) in the late afternoon, when Lionfish are more active. The Alternatives, Sha'ab Mahmood, Sinai, Egypt. Red Sea.
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Ian Coleman / Illustration of pelvic fin of Gray reef shark (Carcharhinus amblyrhynchos). Endangered/threatened species.
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Ian Coleman / Illustration of pelvic fin of Caribbean reef shark (Carcharhinus perezi). Endangered / threatened species.
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Tony Wu / Mature lumpfish (Eumicrotremus taranetzi) with visible disk comprising modified pelvic fins used as sucker to adhere to rocks and other surfaces. Pacific Ocean, Hokkaido, Japan.
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Magnus Lundgren / Monkfish (Lophius piscatorius) photographed at night, Saltstraumen, Bodö, Norway. Magnus