Three-spined Stickleback (partially plated morph) and Similar Species
Gasterosteus gymnurus
Got a photo? Identify fish instantly with the Fishby app.
Open the appSeveral fish can be confused with Three-spined Stickleback (partially plated morph). Here are the key differences.
Species often confused with {name}
Three-spined Stickleback (fully plated morph)
Gasterosteus aculeatus (trachurus morph)
Key differences: Possesses a complete series of 28-36 lateral bony plates along the entire flank, forming a continuous keel on the caudal peduncle. This is the most common marine and anadromous form.
Three-spined Stickleback (partially plated morph)
Gasterosteus aculeatus (leiurus morph)
Key differences: Has a reduced number of lateral plates (typically 4-10) concentrated anteriorly, but usually still possesses some plates on the posterior flanks, unlike the 'gymnurus' morph which often lacks them entirely posteriorly.
Nine-spined Stickleback
Pungitius pungitius
Key differences: Distinguished by having 7-12 (typically 9) short, isolated dorsal spines, compared to the three prominent spines of Gasterosteus species. Generally smaller and more slender.
Four-spined Stickleback
Apeltes quadracus
Key differences: Possesses 3-5 (typically 4) dorsal spines, which are shorter and more slender than those of Gasterosteus. The pelvic fins are also different, with a single spine and no soft ray.
Explore Three-spined Stickleback (partially plated morph)
Identify fish anywhere
Free on iOS, Android, and Web. Photo identification, full species details, and more.