A juvenile lion-fish 

Pterois is a class of venomous marine fish, ordinarily known as lionfish, local to the Indo-Pacific. Pterois is portrayed by striking cautioning coloration with red, white, rich, or dark groups, conspicuous pectoral balances, and venomous spiky blade beams. Pterois radiata, Pterois volitans, and Pterois miles are the most ordinarily considered species in the sort. Pterois species are prominent aquarium fish. P. volitans and P. miles are huge intrusive species in the west Atlantic and Caribbean Sea. 

Pterois angle in the Atlantic reach from 5 to 45 cm (2.0 to 17.7 in) long, weighing from 0.025 to 1.3 kg (0.055 to 2.866 lb). They are well known for their lavish excellence, venomous spines, and special limbs. Adolescent lionfish have an one of a kind arm spotted over their eye attachments that shifts in phenotype between species. The development of this limb is proposed to serve to persistently pull in new prey; examines additionally recommend it assumes a part in sexual determination. 

Lionfish are known for their venomous balance beams, an extraordinary peculiarity among marine fish in the East Coast coral reefs. The strength of their venom makes them astounding predators and noxious to anglers and jumpers. Pterois venom created negative inotropic and chronotropic impacts when tried in both frog and mollusk hearts and has a discouraging impact on rabbit pulse. These results are thought to be because of nitric oxide discharge. In people, Pterois venom can result in systemic impacts, for example, amazing agony, sickness, spewing, fever, breathing challenges, shakings, dazedness, redness on the influenced range, migraine, deadness, paresthesia (sticks and needles), acid reflux, loose bowels, and sweating. Seldom, such stings can result in interim loss of motion of the appendages, heart disappointment, and even passing. Fatalities are normal in extremely youthful youngsters, the elderly, those with a frail safe framework, or the individuals who are hypersensitive to their venom. Their venom is seldom lethal to solid people, yet a few species have enough venom to deliver great distress for a time of a few days. On the other hand, Pterois venom is a peril to unfavorably susceptible victimized people as they may encounter hypersensitivity, a genuine and frequently life-debilitating condition that requires quick crisis therapeutic treatment. Serious hypersensitive responses to Pterois venom incorporate midsection torment, extreme breathing troubles, a drop in circulatory strain, swelling of the tongue, sweating, runny nose, or slurred discourse. Such responses could be lethal if not treated. 

Lionfish are palatable if arranged effectively.