Alex Mustard / RF - School of large Atlantic bluefin tuna (Thunnus thynnus) captive in a growing pen. Depsite looking much smaller in the photo, these fish were 1.5m (5ft) long. Malta. Mediterranean Sea. (This image...
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Pascal Kobeh / Three-lobed / Painted porcelain crab (Porcellanella triloba) in a Sea pen (Pteroeides or Pennatula sp) Sulu Sea, Philippines
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Richard Robinson / Large sea pens (Pteroeides bollonsi) in Doubtful Sound, Fiordland National Park, New Zealand.
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Richard Robinson / Large sea pen (Pteroeides bollonsi) in Doubtful Sound, Fiordland National Park, New Zealand.
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Richard Robinson / Large sea pen (Pteroeides bollonsi) in Doubtful Sound, Fiordland National Park, New Zealand.
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Richard Robinson / Large sea pen (Pteroeides bollonsi) in Doubtful Sound, Fiordland National Park, New Zealand.
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Richard Robinson / Large sea pen (Pteroeides bollonsi) in Doubtful Sound, Fiordland National Park, New Zealand.
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Richard Robinson / Large sea pen (Pteroeides bollonsi) in Doubtful Sound, Fiordland National Park, New Zealand.
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Richard Robinson / Large sea pens (Pteroeides bollonsi) in Doubtful Sound, Fiordland National Park, New Zealand.
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Richard Robinson / Large sea pen (Pteroeides bollonsi) in Doubtful Sound, Fiordland National Park, New Zealand.
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Alex Mustard / School of large Atlantic bluefin tuna (Thunnus thynnus) captive in growing pen. Depsite looking much smaller in the photo, these fish were 1.5m (5ft) long. Malta. Mediterranean Sea.
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Alex Mustard / Noble pen shell (Pinna nobilis), a large bivalve shell (this individual was about 60cm/2ft), endemic to the Mediterraean, grows vertically from a bed of Caulerpa algae. Calasetta, Island of Sant'Antio...
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Alex Mustard / Decorative sea silk, woven from the spun byssus threads produced by the large bivalve mollusc, the Noble pen shell (Pinna nobilis). Calasetta, Island of Sant'Antioco, Sardinia, Italy. Mediterranean Se...
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Jeff Rotman / Diver examines Giant Gurney's sea pen (Ptilosarcus gurneyi) British Columbia, Canada, North Pacific Model released.
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Fred Bavendam / Sea Pen (Sarcoptilus grandis) field with an Ocellate Sea Star (Nectria ocellata) crawling among them, Port Davey, Tasmania, Australia
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Franco Banfi / Spiny sea-pen (Pteroeides griseum) on sandy seabed, Marine Protected area Punta Campanella, Costa Amalfitana, Italy, Tyrrhenian Sea.
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Franco Banfi / Spiny sea-pen (Pteroeides griseum) on sandy seabed, Marine Protected area Punta Campanella, Costa Amalfitana, Italy, Tyrrhenian Sea.
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Franco Banfi / Noble pen shell (Pinna nobilis) a large species of Mediterranean clam, Ponza Island, Italy, Tyrrhenian Sea, Mediterranean. Critically Endangered.
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Georgette Douwma / Sea pen (Pteroeides sp.) Lembeh Strait, North Sulawesi, Indonesia.
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Alex Mustard / Noble pen shell (Pinna nobilis), a large bivalve shell (this individual was about 60cm) endemic to the Mediterraean, grows vertically in a Mediterranean sea grass (Posidonia oceanica) meadow. Costa Pa...