Eulachon and Similar Species
Thaleichthys pacificus
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Open the appSeveral fish can be confused with Eulachon. Here are the key differences.
Species often confused with {name}
Longfin Smelt
Spirinchus thaleichthys
Key differences: Longfin smelt have much longer pectoral fins, often reaching past the origin of the dorsal fin, and lack the prominent concentric striations on the operculum seen in eulachon. Their body is generally more slender.
Surf Smelt
Hypomesus pretiosus
Key differences: Surf smelt have a smaller mouth that does not extend past the middle of the eye, and their scales are larger and more noticeable. They also lack the distinct opercular striations of eulachon.
Delta Smelt
Hypomesus transpacificus
Key differences: Delta smelt are generally smaller, more slender, and have a more pointed snout. Their geographic range is restricted to the Sacramento-San Joaquin Delta, while eulachon are found along the Pacific coast.
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