Fish
Striped Mullet
Mugil cephalus · also called striped mullets, flathead mullet
Without any obvious predator in sight, a striped mullet suddenly launches itself clear out of the water and splashes back down, a behaviour so common for the species that researchers still debate exactly why it happens so often.
Overview
The striped mullet, Mugil cephalus, is a schooling fish native to coastal and estuarine waters across tropical and temperate regions worldwide, including extensive coastlines of North America. Its puzzling habit of leaping out of the water, gizzard-like stomach adapted for processing sediment, and remarkable tolerance for varying salinity make it one of the more behaviourally distinctive and ecologically adaptable fish found along the coast.
A jump nobody has fully explained
Despite being one of the most frequently observed fish behaviours along the coast, the striped mullet’s habit of leaping clear out of the water still lacks a single, universally agreed-upon explanation among the researchers who study it.
Status
Least Concern — widespread and abundant across suitable coastal and estuarine habitat throughout its extensive worldwide range.
Striped Mullet: common questions
Why does the striped mullet jump out of the water?
This species frequently leaps entirely out of the water, a behaviour common enough to be one of its signature traits, though researchers still debate the exact cause, with proposed explanations including dislodging external parasites, gulping air to supplement oxygen intake in low-oxygen water, or simply reacting to a startling disturbance nearby.
How does the striped mullet digest the sediment it eats?
This species has a thick, muscular stomach structurally similar to a bird's gizzard, an adaptation that helps grind up the mud, sand, algae, and organic material the fish filters from the sea floor while feeding, allowing it to extract nutrition from material most other fish could not process effectively.
Can the striped mullet live in both saltwater and freshwater?
Yes, this species tolerates a remarkably wide range of salinity levels, moving freely between full-strength seawater, brackish estuaries, and even nearly freshwater conditions, a flexibility that lets it occupy a broad variety of coastal and estuarine habitat.
Is the striped mullet an important fishery species?
Yes, this species supports significant commercial and recreational fisheries across various parts of its extensive worldwide range, valued both as a food fish and, in some regions, specifically for its roe, making it an economically important species well beyond its ecological role.