CONTENTS - Continued 



SECTION 11. - PUERTO RICO FISHERIES 326 



Summary of operating units 326 



Landings by regions 327 



Landings of catch by gear 328 



Landings 1953-75 329 



SECTION 12. - REVIEW OF CERTAIN MAJOR FISHERIES 331 



Atlantic ocean perch fishery 331 



U.S. cod fishery 332 



Atlantic coast haddock fishery 334 



Pacific coast salmon fishery 335 



Atlantic coast tuna fishery 341 



Pacific tuna fishery 342 



Landings of tuna by U.S. flag vessels, by ocean of capture and species, 1960-7 5 . . . 346 



U.S. menhaden fishery 347 



U.S. clam fishery 351 



U.S. crab fishery 354 



U.S. oyster fishery 360 



U.S. shrimp fishery 366 



U.S. fish otter trawl fleet 371 



SECTION 13. - STATISTICAL SURVEY PROCEDURE 376 



Local and special surveys 381 



Practices and terms 383 



Conversion factors 384 



SECTION 14. - GLOSSARY . . 386 



SECTION 15. - PICTORIAL SECTION 39E 



SECTION 16. - STATISTICAL PUBLICATIONS 416 



vi 



