Allis Shad and Similar Species
Alosa alosa
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Open the appSeveral fish can be confused with Allis Shad. Here are the key differences.
Species often confused with {name}
Twaite Shad
Alosa fallax
Key differences: Twaite Shad typically have 3-10 distinct dark spots along their flanks, whereas Allis Shad usually have only one prominent spot (occasionally followed by a few faint ones). Twaite Shad also have fewer and coarser gill rakers (35-60 on the lower limb of the first gill arch) compared to Allis Shad (90-130).
American Shad
Alosa sapidissima
Key differences: American Shad are found in North America and are generally larger than Allis Shad. While they also have a silvery body and a dark spot behind the operculum, their geographic distribution is distinct. Morphologically, gill raker counts and fin ray counts can differ, but the primary distinction is geographic.
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