. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. Calif. Fish and Game 62(2): 132-140. 1976. THE VALIDITY OF OTOLITHS AS INDICATORS OF AGE OF PETRALE SOLE FROM CALIFORNIA^ PAUL A. GREGORY ^ and TOM JOW Marine Resources Region California Department of Fish and Gome Otoliths from juvenile petrale sole, Eopsetta jordani {\.ock\nq\on), caught in research vessel trawls from San Francisco and Crescent City Areas of California were used with otoliths from petrale sole less than 33 cm (13 in
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. Calif. Fish and Game 62(2): 132-140. 1976. THE VALIDITY OF OTOLITHS AS INDICATORS OF AGE OF PETRALE SOLE FROM CALIFORNIA^ PAUL A. GREGORY ^ and TOM JOW Marine Resources Region California Department of Fish and Gome Otoliths from juvenile petrale sole, Eopsetta jordani {\.ock\nq\on), caught in research vessel trawls from San Francisco and Crescent City Areas of California were used with otoliths from petrale sole less than 33 cm (13 inches) from commercial catches off San Francisco to determine their validity as age indicators. Validity of petrale sole otoliths for use in age studies is supported by seasonal formation of the different marginal zones, modes in length frequencies of immature fish that correspond to age groups, and correspondence of calculated and actual sixes of age groups. The formation of the first annulus is completed in spring over a year after spawning when calculated and ob- served average lengths are cm ( inches) and cm ( inches) respectively. Aging criteria are presented to assure proper year class assignment. INTRODUCTION Petrale sole, Eopsetta jordani, (Lockington), is one of the most impor- tant flatfish in the Pacific coast trawl fishery. In California, petrale sole rank third in poundage behind catches of English sole, Parophrys vetulus, and dover sole, Microstomus pacificus. Annual petrale sole landings ranged from 30 to 2,305 megagrams (Mg) (66,000 to 5,082,000 lb) between 1924 and 1961. Since 1962 petrale sole landings have been stable and averaged 1,392 Mg (3,066,000 lb). Age composition of petrale sole in the California fishery is needed to estimate parameters for stock assessments and an age sampling program based on otoliths is in progress. Petrale sole scales are unsatisfactory for aging because they have indistinct, evenly spaced circuli. Oth^r methods of
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