Marine species guide
Lionfish
Lionfish are unmistakable reef predators with venomous spines. Divers should recognise them quickly—both for safety and, in invaded Atlantic/Caribbean waters, for awareness of ecological impact.
Identification features
Fan-like pectoral fins, zebralike bars, and long dorsal spines define Pterois species. Red Sea and Indo-Pacific hosts are native; Atlantic and Mediterranean populations are invasive in many areas.
- Venomous dorsal and fin spines
- Bold bars and fan pectorals
- Often hover near overhangs
- Native Indo-Pacific; invasive elsewhere
Habitat and behaviour
Spines deliver a painful venom if touched. The fish itself is not aggressive but will raise spines when threatened.
Where and when to see them
Do not confuse with other scorpionfishes that are more camouflaged; lionfish are typically openly perched on reef structure.
Dive tips
Do not confuse with other scorpionfishes that are more camouflaged; lionfish are typically openly perched on reef structure.
Frequently asked questions
How do I confirm the ID?
Combine visible traits with location and depth, then compare photos in Scuba Steve’s fish identification app and regional guides.
Should I touch it?
No. Maintain neutral buoyancy and a respectful distance for safety and animal welfare.
Where can I learn more?
See related dive-site guides on Scuba Steve and ask local operators about recent conditions.