< 60 cm
Alosa alosa (L.)
- Family: Herrings – Clupeidae
- Similar species: twaite shad
- Size: 30–60 cm, 0.5–2 kg.
- Appearance: The only allis shad encountered in Finnish waters to date have been large individuals and thus easily distinguished from the sprat and Baltic herring. A typical herring in appearance, lateral line conspicuous by its absence. Belly more rounded than that of sprat and Baltic herring. Gill cover distinctly ridged, scales large, somewhat loose. Eye covered by a nictating membrane. Most resembles its cousin the twaite shad, which is more common in Finnish waters. The two are distinguished by the number of gill rakers on the first gill arch: over 60 (usually 80-130) for the allis shad and usually fewer than 60 for the twaite shad.
- Colouring: Back bluish green, head brown, some gold colour on operculum. Sides generally silvery, sometimes with a golden tinge. Characteristic is the large dark blotch on the body just behind the gill cover, though this may fade after the fish is killed.
- Reproduction: Ascends rivers to spawn. Not known to spawn in Finland.
- Food: Plankton.
- Distribution and habitat: An unusual visitor to Finnish waters, identified only twice, most recently off the island of Nauvo in southern Finland in 2002.
Other species from the same genus
Other species from the same family
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