Brook Stickleback and Similar Species
Culaea inconstans
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Open the appSeveral fish can be confused with Brook Stickleback. Here are the key differences.
Species often confused with {name}
Threespine Stickleback
Gasterosteus aculeatus
Key differences: Possesses 3 (rarely 2 or 4) dorsal spines, which are typically larger and more robust. Has prominent bony lateral plates along the sides of the body, which are absent or rudimentary in Brook Sticklebacks. Breeding males are often red on the ventral side, not black.
Ninespine Stickleback
Pungitius pungitius
Key differences: Characterized by 7-12 (typically 9) short, isolated dorsal spines. Generally more slender and elongated than the Brook Stickleback. Often found in colder, more northern waters, and can tolerate brackish conditions.
Fourspine Stickleback
Apeltes quadracus
Key differences: Typically has 4 dorsal spines, but these are often arranged in a zig-zag pattern. The caudal peduncle is notably slender and compressed. Primarily found in brackish and marine environments along the Atlantic coast.
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