CALIFORNIA FISH AND GAME 7 



used for bait. Several diggers supply the bait stands with thousands 

 of jack-knife clams daily during the summer. 



2. Hard-shell cockles (species of Chione). 



3. Rock cockle (Paphia staminea). 



4. Scallop (Pecten circularis). 



5. Gaper (Schizothaerus nuttalli). 



6. Washington clam (Saxidomus nuttalli). 



7. Purple clam (Sanguinolaria nuttalli) . 



8. Wedge shell (Donax calif ornica) . 



Other species probably occur in the bay. The cockles are used to 

 some extent as food and bait. All others, with the exception of the 

 jack-knife clam, appear to be too scarce to be of any importance. 



Fig. 2. A view of part of Mission Bay, showing tlie moutli of one of the larger 

 sloughs; Old Town in the background. Photo by authors, November, 1933. 



Crahs 



Several species of crabs occur in Mission Bay. Probably none of 

 them reaches a size large enough for human consumption. The crabs 

 are important, however, as a source of food for game fishes. They are 

 noted as bait stealers and as such are a nuisance to anglers. 



Other Shellfish 



The burrowing shrimp (species of Callianassa) is very common in 

 Mission Bay. It is extensively used as bait. Locally called ''craw- 

 fish." Gathered in large numbers for sale by bait stands. 



