This Caspian Tern has caught or repositioned this Clupeid and if you review the related Flickr photo set by jsutton8 you can see the tern evading some kleptopiratic Western Gulls. This fish is at least two bill length (7 cm) or approximately 15 cm. It has the small clear heavily forked and acuminate (pointy) tips to the tail and a sharp keel to the belly. Not the clear keel sharpness near the slightly flared operculum. An anchovy would be more rounded in the belly. The size and roundness of the operculum is chararcteristic of both herring and sardine in the SF Bay area and without a clear view of the mouth, head from the top and eyes it is impossible to tell.
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