Spanish Sardine Identification Guide
How to identify Spanish sardine by its dark shoulder spot and lack of a trailing dorsal filament.
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Key identification features
- Elongate, moderately compressed silvery body reaching up to about 30 cm
- Blue-green back fading into bright silvery flanks
- A single prominent dark spot behind the gill cover, occasionally followed by a faint row of smaller spots
- Deeply forked tail fin
- Single dorsal fin set at mid-body
- Sharp keel of scutes running along the belly
Common look-alikes
- Atlantic thread herring: shares a similar shoulder spot and body shape but has a long filament trailing from the last dorsal ray, which Spanish sardine lacks.
- Indian oil sardine: similar in shape but occurs in a different ocean basin and shows a more golden sheen with only a faint shoulder spot rather than a bold one.
- Round herring: lacks any dark shoulder spot and has a smooth, unkeeled, rounder belly compared to Spanish sardine's flattened, scuted body.
Where you'll see one
Spanish sardine schools in warm coastal Atlantic waters, including the Gulf of Mexico, Caribbean Sea, and parts of the Mediterranean, staying over the continental shelf in open, current-swept water.
Frequently asked questions
How do I tell Spanish sardine from Atlantic thread herring?
Check the dorsal fin: Atlantic thread herring has a long trailing filament on its last dorsal ray, a feature completely absent in Spanish sardine, which otherwise looks very similar.
What is the clearest mark for identifying a Spanish sardine?
A single bold dark spot just behind the gill cover on an elongate, silvery, scuted body is the most reliable field mark.