Shane Gross / Red lionfish (Pterois volitans) swimming under a coral ledge, Palau.

Shane Gross / Invasive Lionfish (Pterois volitans) which have taken over and are wiping out native fish in the Atlantic ocean. The highest densities are in the northern gulf of Mexico. Destin, Florida, USA.

Shane Gross / Invasive Lionfish (Pterois volitans) which have taken over and are wiping out native fish in the Atlantic ocean. The highest densities are in the northern gulf of Mexico. Destin, Florida, USA.

Georgette Douwma / Shortfin lionfish (Dendrochirus brachypterus). Lembeh Strait, North Sulawesi, Indonesia.

Alex Mustard / Lionfish (Pterois volitans) sitting on the rim of large sponge on Bloody Bay Wall, Little Cayman, Cayman Islands, Caribbean Sea.

Jurgen Freund / Face of a Common lionfish (Pterios volitans) on top of the reef. Lembeh Strait, North Sulawesi, Indonesia

Jurgen Freund / Common lionfish (Pterois volitans) seen from the rear. Lembeh Strait, North Sulawesi, Indonesia

Jurgen Freund / Yellow Shortfin lionfish (Dendrochirus brachypterus) face. Lembeh Strait, Sulawesi, Indonesia

Tim Laman / Lionfish (Pterois) hovering in a Sea Fan in a view looking toward the surface of the water. Misool Island vicinity. Near smaller island of Fiabacet. West Papua, Indonesia, April 2007

David Fleetham / White-eyed moray eel (Muraena thyrsoides) close to Zebra lionfish (Dendrochirus zebra), Philippines.

Doug Perrine / Lionfish {Pterois miles} with Seafan in foreground, Thailand

Georgette Douwma / Lionfish (Pterois volitans) hunting over anemone. Lembeh Strait, North Sulawesi, Indonesia

Georgette Douwma / Lionfish / Turkeyfish group hunting on coral reef {Pterois volitans} Andaman sea, Thailand

Georgette Douwma / Lionfish (Pterois miles) swimming by shipwreck. Red Sea, Egypt

Jurgen Freund / Lionfish on coral reef, Indo-Pacific

Chris Newbert / Common Lionfish (Pterois volitans), 70 feet deep, Solomon Islands

Chris Newbert / Soft Coral (Dendronephthya sp) schooling Pygmy Sweeper (Parapriacanthus ransonneti) and Lionfish (Pterois volitans)

Chris Newbert / Common Lionfish (Pterois volitans) swimming over reef, 20 feet deep, Red Sea

Chris Newbert / Common Lionfish (Pterois volitans) swimming over coral reef, Red Sea

Gary Bell/ Oceanwide / Zebra Lionfish (Dendrochirus zebra), Great Barrier Reef, Australia

Fred Bavendam / Common Lionfish (Pterois volitans) lurking among Feather Star Crinoids clinging to the lip of a large Barrel Sponge, Bali, Indonesia

Shane Gross / Red lionfish (Pterois volitans) hunting Moluccan cardinal fish (Apogon moluccensis) in Tape grass (Enhalus acoroides) seagrass bed. North Sulawesi, Indonesia.

Shane Gross / Red lionfish (Pterois volitans), two on sea floor beside Crocodile fish (Cymbacephalus beauforti), an ambush predator camouflaged and hidden. Marsa Alam, Egypt.

Georgette Douwma / Shortfin lionfish (Dendrochirus brachypterus) next to green algae (Halimeda copiosa). Lembeh Strait, North Sulawesi, indonesia.

Magnus Lundgren / Larval cardinal fish, mimicking lionfish, found free swimming in the pelagic zone. Balayan Bay, Luzon Island, Philippines. Minimum fees apply.

David Fleetham / Underwater photographer lines up on two Lionfish (Pterois volitans) resting in a sponge, Indonesia.

David Fleetham / Lionfish (Pterois volitans) in white polyp black coral, Tulamben, Bali, Indonesia.

Georgette Douwma / Juvenile Common lionfish (Pterois volitans). Tulamben, Bali, Indonesia.

Georgette Douwma / Common lionfish (Pterois volitans) hunting cardinalfish over coral reef. Andaman Sea, Thailand.

Alex Mustard / A backlit photo of a British World War II BSA M20 motorbike inside Hold 2 (port side, upper level) of the wreck of the Thistlegorm, with lionfish (Pterois volitans). Sha'ab Ali, Red Sea. Sinai, Eg...

Alex Mustard / Clearfin lionfish (Pterois radiata) mating. The female (left) has just released a raft of eggs, which is visible between her tail and the red face of the male. Taken around dusk, during the summer in...

Fred Olivier / Lionfish (Pterois volitans) above coral, swimming in current, Uepi Island, Solomon Islands.

Fred Olivier / Lionfish (Pterois volitans) swimming over a coral reef, Uepi Island, Solomon Islands.

Fred Olivier / Lionfish (Pterois volitans) above coral, swimming in current, Uepi Island, Solomon Islands.

Pascal Kobeh / Common lionfish (Pterois volitans or miles) feeding, Bennett's sharpnose puffer (Canthigaster bennetti) in mouth. Flores Sea, Indonesia.

David Hall / Blackfoot firefish (Parapterois hetururus) on gravel. Pantar, Alor Archipelago, Indonesia.

David Hall / Blackfoot firefish (Parapterois heterurus), blue stripes on pectoral fin when threatened, on gravel. Pantar, Alor Archipelago, Indonesia.

David Hall / Blackfoot firefish (Parapterois heterura), blue striped pectoral fins displayed as a response to threat. Pantar Island, Alor Archipelago, Indonesia.

Tony Wu / Bluestreak cleaner wrasse (Labroides dimidiatus) cleaning Luna lionfish (Pterois lunulata). Shizuoka Prefecture, Honshu, Japan. June.

Magnus Lundgren / Wild Wonders of China / Zebra lionfish, or zebra turkeyfish (Dendrochirus zebra) venomous species, Xiaoliuqiu Island, Taiwan

Shane Gross / Lionfish derby, a competition to catch invasive Lionfish (Pterois volitans). One team caught 466 lionfish in a single day during the Green Turtle Cay, Bahamas, June 2016

Shane Gross / Lionfish (Pterois volitans) caught in a Lionfish derby, a competition to catch invasive Lionfish (Pterois volitans). One team caught 466 lionfish in a single day during the Green Turtle Cay, Bahamas,...

Shane Gross / Scuba diver feeds an invasive lionfish (Pterois volitans) to a Caribbean reef shark (Carcharhinus perezi) off Grand Bahama Island, Bahamas. It was once thought that if the sharks learned that lionfish...

Shane Gross / Scuba diver feeds an invasive lionfish (Pterois volitans) to a Caribbean reef shark (Carcharhinus perezi) off Grand Bahama Island, Bahamas. It was once thought that if the sharks learned that lionfish...

Shane Gross / Scuba diver spears and invasive lionfish (Pterois volitans) off Grand Bahama Island, Bahamas. Spearing is illegal in The Bahamas, however, a special exemption was made for lionfish.

Shane Gross / An invasive lionfish (Pterois volitans) is fed to a Caribbean reef shark (Carcharhinus perezi) off Grand Bahama Island, Bahamas. It was once thought sharks could be trianed to feed on lionfish by feed...

Shane Gross / A scuba diver spears an invasive lionfish (Pterois volitans) off Grand Bahama Island, Bahamas. Spearing is illegal in The Bahamas, however, a special exemption was made for lionfish.

Shane Gross / Sign for Lionfish drop off. Local fisherman are paid to catch invasive lionfish (Pterois volitans) in the Caribbean to help reduce their numbers and, in turn, help the reefs. Image made on Eleuthera,...