Fish
Fish
King Coscorub (Leaf Fish)
Polycentrus schomburgkii
The King Coscorub, or leaf fish, is a small predatory fish so perfectly disguised as a dead leaf that it drifts motionless among real leaf litter until prey strays within striking range, one of the more remarkable examples of camouflage among Trinidad's freshwater fish.
The King Coscorub, or leaf fish, is a small predatory fish so perfectly disguised as a dead leaf that it drifts motionless among real leaf litter until prey strays within striking range, one of the more remarkable examples of camouflage among Trinidad's freshwater fish.
Identification
A laterally compressed, mottled brown fish shaped remarkably like a dead leaf, complete with a pointed, elongated "stem" projection at the mouth end that completes the illusion. Adults reach around 8 to 10 cm, with fins reduced and positioned to preserve the leaf-like silhouette rather than aid fast swimming.
Ecology
An ambush predator that drifts passively, often tilted at an angle, among real leaf litter accumulated in still or slow water, relying entirely on camouflage rather than pursuit to approach prey undetected. It strikes suddenly with a rapid gape when small fish and invertebrates come within range, a hunting strategy that requires almost no active searching once positioned among suitable leaf litter.
In Trinidad and Tobago
Found in swamps, slow streams, and leaf-littered pools in Trinidad, easily overlooked due to its exceptional camouflage; most sightings occur only when the fish moves or is specifically searched for among accumulated leaf litter.
Threats
- Wetland habitat loss
- Loss of leaf litter accumulation from stream disturbance
