You can nearly see them on every dive here in the area, hovering over the bottom. The lionfish is member of the family Scorpaenidae where you also find the other members like scorpionfish and stonefish.
They are notable for their extremely long and separated spines, and have a generally striped appearance, red, green, navy green, brown, orange, yellow, black, maroon, or white.

A common lionfish hovering in front of a coral.
The lionfish is native to the Asia Pacific oceanic region. This range extends from Western Australia and Malaysia east to French Polynesia. In addition, the range also extends north to southern Japan and southern Korea and south to parts of coastal Australia.

A zebra lionfish resting on the bottom of the seabed.
Although the lionfish is not native to all regions in the world, these fish continue to spread throughout many parts of the world. Due to a recent introduction, the lionfish has been spotted in the warmer coral regions of the eastern Atlantic Ocean around the Azores and extending into the Mediterranean Sea, and also in the Caribbean Sea and even in the USA.

A common lionfish in warning posture.
The lionfish have very few natural predators, but the grouper and other bigger fishes have been found with lionfish remains in their stomachs. Other as yet undocumented predators of the lionfish might include sharks, as many sharks are known to consume noxious or venomous organisms with no obvious ill effects.
There are many types of lionfish that vary in size. The common lionfish, generally reaches a size of 30 cm to 35 cm, while smaller lionfish, like the fuzzy dwarf lionfish are typically the size of a tennis ball, not including fins. In the Caribbean where lionfish are not indigenous, they can grow to up to 55 cm. The very rare blackfoot lionfish may usually be found in sheltered coastal bays with a soft bottom, such as fine sand or mud. It's found in depths ranging from 40-300 meters.

A rare sight, a blackfoot lionfish in Sabang Bay in only 9 meters of water.
The lionfish is one of the most venomous fish on the ocean floor. Lionfish have venomous dorsal spines that are used purely for defense. When threatened, the fish often faces its attacker in an upside down posture which brings its spines to bear. However, a lionfish's sting is usually not fatal to humans. If a human is envenomed, that person will experience extreme pain, and possibly headaches, vomiting, and breathing difficulties. A common treatment is soaking the afflicted area in hot water, as very few hospitals carry specific treatments. However, immediate emergency medical treatment is still advised, as some people are more susceptible to the venom than others.

A spotfin lionfish relaxing inside the wreck of M/V Alma Jane.
Lionfish are voracious predators. They do not use their spines to capture prey; only for protection from their own predators. When hunting, they corner prey using their large fins and then use their quick reflexes to swallow the prey whole. They hunt primarily from late afternoon to dawn.
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