Three-spined Stickleback and Similar Species
Gasterosteus aculeatus
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Open the appSeveral fish can be confused with Three-spined Stickleback. Here are the key differences.
Species often confused with {name}
Ten-spined Stickleback
Pungitius pungitius
Key differences: Has 9-12 short, isolated dorsal spines (vs. 3 prominent spines in G. aculeatus). Generally smaller and more slender, often found in heavily vegetated areas.
Four-spined Stickleback
Apeltes quadracus
Key differences: Typically has 3-5 dorsal spines, but the last spine is often attached to the soft dorsal fin. The pelvic fins are located further back than in G. aculeatus, and it has a more compressed body shape. Primarily found in brackish and marine waters along the Atlantic coast of North America.
Brook Stickleback
Culaea inconstans
Key differences: Has 4-6 short, isolated dorsal spines. Lacks lateral bony plates. Found exclusively in freshwater in North America.
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