
1) California food fish 2) Fish 3) Fish that spawns at high tide 4) Sardine-shaped fish
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https://www.crosswordclues.com/clue/grunion

Grunion are two fish species of the genus Leuresthes: the California grunion, L. tenuis, and the Gulf grunion L. sardinas. They are sardine-sized teleost fishes of the Atherinopsidae family of New World silversides, found only off the coast of California, USA, and Baja California, Mexico, where the species are found on both the Pacific Ocean and G...
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http://en.wikipedia.org/wiki/Grunion

(species Leuresthes tenuis), small Pacific fish of the family Atherinidae (order Atheriniformes). The species is found in the Pacific Ocean along ... [4 related articles]
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http://www.britannica.com/eb/a-z/g/76

The USS Grunion was an American Gato Class submarine of 1525 tons displacement launched in 1942 and lost during the Second World War. The USS Grunion had a top speed of 21 knots surfaced and carried a complement of between 65 and 74. She was armed with one 3 inch dual-purpose gun; two 20 mm Oerlikon anti-aircraft guns; six 21 inch bow torpedo tubes...
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http://www.probertencyclopaedia.com/browse/RG.HTM
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