What is "serranus clathratus"

Kelp \Kelp\ (k[e^]lp), n. [Formerly kilpe; of unknown origin.]

1. The calcined ashes of seaweed, -- formerly much used in the manufacture of glass, now used in the manufacture of iodine.

2. (Bot.) Any large blackish seaweed.

   Note: Laminaria is the common kelp of Great Britain; Macrocystis pyrifera and Nereocystis Lutkeana are the great kelps of the Pacific Ocean.

   Kelp crab (Zo["o]l.), a California spider crab ( Epialtus productus), found among seaweeds, which it resembles in color.

   Kelp salmon (Zo["o]l.), a serranoid food fish ( Serranus clathratus) of California. See Cabrilla.