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    Milletseed Butterflyfish (Chaetodon citrinellus) foraging near turf algae and feather hydroids (Gymnangium hians) on a reef at Ni'ihau island near Kauai, Hawaii, during the spring. This fish species is endemic to the Hawaiian Islands; Kauai, Hawaii — Stock Photo
    Milletseed Butterflyfish (Chaetodon citrinellus) foraging near turf algae and feather hydroids (Gymnangium hians) on a reef at Ni'ihau island near Kauai, Hawaii, during the spring. This fish species is endemic to the Hawaiian Islands; Kauai, Hawaii
    Florida manatee covered with algae in Crystal River, Florida, USA — Stock Photo
    Florida manatee covered with algae in Crystal River, Florida, USA
    Giant kelp forest — Stock Photo
    Giant kelp forest
    Nudibranch feeding on algae — Stock Photo
    Nudibranch feeding on algae
    Chirashizushi and miso served in traditional Japanese dishes — Stock Photo
    Chirashizushi and miso served in traditional Japanese dishes
    Redband parrotfish swimming over reef — Stock Photo
    Redband parrotfish swimming over reef
    Spotfin butterflyfish feeding on coral reef — Stock Photo
    Spotfin butterflyfish feeding on coral reef
    Back view of man walking along wet beach among marine algae against blurred horizon and cloudy sky in daytime in Scotland — Stock Photo
    Back view of man walking along wet beach among marine algae against blurred horizon and cloudy sky in daytime in Scotland
    United Kingdom, Scotland, Highlands, Isle of Skye, seal on the island bay with stones overgrown by algae — Stock Photo
    United Kingdom, Scotland, Highlands, Isle of Skye, seal on the island bay with stones overgrown by algae
    United Kingdom, Scotland, Highlands, Isle of Skye, seal by algae shore — Stock Photo
    United Kingdom, Scotland, Highlands, Isle of Skye, seal by algae shore
    Whole Steamed Lobster — Stock Photo
    Whole Steamed Lobster
    Nudibranch feeding on algae — Stock Photo
    Nudibranch feeding on algae
    Baked beans (lupine beans) with algae — Stock Photo
    Baked beans (lupine beans) with algae
    This Green Linckia (Linckia guildingi) starfish or sea star is unusual in that it has four rather than the normal five arms. It is resting on a volcanic rock ledge located off the Kona coast, the Big Island, Hawaii, USA. Near to it is pink coloured c — Stock Photo
    This Green Linckia (Linckia guildingi) starfish or sea star is unusual in that it has four rather than the normal five arms. It is resting on a volcanic rock ledge located off the Kona coast, the Big Island, Hawaii, USA. Near to it is pink coloured c
    Seaweed with stipes growing on rough coral reefs with polyps under pure ocean aqua — Stock Photo
    Seaweed with stipes growing on rough coral reefs with polyps under pure ocean aqua
    Aulacodiscus oregonus diatom — Stock Photo
    Aulacodiscus oregonus diatom
    Seaweed with stipes growing on rough coral reefs with polyps under pure ocean aqua — Stock Photo
    Seaweed with stipes growing on rough coral reefs with polyps under pure ocean aqua
    School of Atlantic spadefish in coral reef — Stock Photo
    School of Atlantic spadefish in coral reef
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Fresh oysters, opened, on seaweed — Stock Photo
    Fresh oysters, opened, on seaweed
    Nemone surrounded by brown algae — Stock Photo
    Nemone surrounded by brown algae
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Marine pennate diatom frustule — Stock Photo
    Marine pennate diatom frustule
    Corals are beginning to bleach on reef in Indonesia — Stock Photo
    Corals are beginning to bleach on reef in Indonesia
    Natural pattern of yellow bull kelp in water. — Stock Photo
    Natural pattern of yellow bull kelp in water.
    United Kingdom, Scotland, Aberdeenshire, Stonehaven, Small port town cityscape — Stock Photo
    United Kingdom, Scotland, Aberdeenshire, Stonehaven, Small port town cityscape
    Coloured scanning electron micrograph of fresh water centric diatoms frustules type of algae. — Stock Photo
    Coloured scanning electron micrograph of fresh water centric diatoms frustules type of algae.
    Seaweeds, kelp and sea shells on shore, full frame. — Stock Photo
    Seaweeds, kelp and sea shells on shore, full frame.
    Nudibranch feeding on algae — Stock Photo
    Nudibranch feeding on algae
    United Kingdom, Scotland, Highlands, Isle of Skye, seals, Sea Seers on rocky show with algae — Stock Photo
    United Kingdom, Scotland, Highlands, Isle of Skye, seals, Sea Seers on rocky show with algae
    United Kingdom, Scotland, Highlands, Isle of Skye, seal on the island bay with stones overgrown by algae, closeup — Stock Photo
    United Kingdom, Scotland, Highlands, Isle of Skye, seal on the island bay with stones overgrown by algae, closeup
    Flatworm feeding on algae — Stock Photo
    Flatworm feeding on algae
    Flock of Gray Snappers swimming in current — Stock Photo
    Flock of Gray Snappers swimming in current
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Spirulina tablets and spirulina powder on wooden spoons — Stock Photo
    Spirulina tablets and spirulina powder on wooden spoons