Yellow Leaf Scorpionfish: The Master of Camouflage The Yellow Leaf Scorpionfish (Taenianotus triacanthus), also widely known as the Leaf Fish or Paperfish, is one of the most intriguing and unique species available to marine aquarium enthusiasts. Characterized by its bright yellow coloration and extremely laterally compressed (paper-thin) body, this fascinating ambush predator blends seamlessly into its surrounding habitat. Its ability to sway gently back and forth with the water current allows it to mimic a dead leaf or a piece of macroalgae, perfectly fooling both prey and potential predators. Native to the tropical waters of the Indo-Pacific, the Yellow Leaf Scorpionfish is a relatively small species, typically reaching a maximum body length of 3 to 4 inches (7.5-10 cm). Despite its smaller size, it possesses venomous dorsal spines that require careful handling. Because of its sedentary nature and slow swimming habits, a massive aquarium is not required; a minimum tank size of 30 gallons is sufficient, provided the water quality is kept pristine and plenty of live rock or branching coral structures are available for perching. The Yellow Leaf Scorpionfish is a peaceful, slow-moving predator that will not harass tankmates too large to be consumed. However, like other scorpionfish species, caution must be taken when placing hands in the aquarium due to its painful venomous sting. Diet & Compatibility: Diet: This species is a strict Carnivore and specialized ambush predator. In the wild, it feeds on small marine fish, shrimp, and other invertebrates that swim too close to its mouth. In captivity, initial feeding can be challenging, often requiring live foods like ghost shrimp or small feeder fish to initiate a feeding response. With patience, it can often be trained to accept non-living, frozen meaty foods like mysis shrimp, krill, and chopped marine meats presented on a feeding stick. Feeding: Feed 2 to 3 times per week. Target feeding with long tongs or a feeding stick is highly recommended to ensure it receives adequate food, as faster tankmates will easily outcompete it. Reef Compatibility: It is Reef Safe With Caution. The leaf scorpionfish is completely safe around corals, anemones, and sessile invertebrates. However, it will opportunistically consume small ornamental shrimp, crabs, and tiny fish that fit into its cavernous mouth. Temperament: It is Peaceful / Predatory. It is entirely non-aggressive toward fish it cannot swallow. Ideal tankmates include slow-moving, peaceful species such as pipefish, smaller peaceful wrasses, cardinalfish, and dartfish (provided they are larger than the leafish's mouth). Avoid keeping it with fast, aggressive feeders or fin-nipping species like triggers, large angels, or aggressive wrasses. Venomous Spines: The dorsal spines contain a protein-based venom that causes severe localized pain and swelling. If accidentally stung, immediately submerge the affected area in hot water (as hot as can be tolerated without burning) for 30 to 90 minutes to break down the venom, and seek medical attention. Quick Facts Scientific Name: Taenianotus triacanthus Primary Common Name: Yellow Leaf Scorpionfish Other Common Names: Leaf Fish, Paperfish, Leaf Scorpionfish Origin: Indo-Pacific Max Size: 3-4 inches (7.5-10 cm) Temperament: Peaceful / Predatory (Venomous) Diet: Carnivore (Prefers live food, can be stick-fed) Minimum Tank Size: 30 Gallons Reef Compatibility: With Caution (Will eat small shrimp and small fish)