. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 40 CALIFOHXIA FISII AM) CAME. r- 'jfl FIGURE 1. Photomicrograph of scale from 581 mm albacore. One annuius near the anterior scale radius is clear. Photographed with an Exocta mounted on a Zeiss stereomicroscope; 1 50 sec, mag. 40 x; film Kodachrome, KA 135-balanced for flood; lighting incident tungsten, no filters. Photograph by R. R. Bell. Those in the vicinity of the fifth dorsal finlet were free from oil and blisterino: and had c
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 40 CALIFOHXIA FISII AM) CAME. r- 'jfl FIGURE 1. Photomicrograph of scale from 581 mm albacore. One annuius near the anterior scale radius is clear. Photographed with an Exocta mounted on a Zeiss stereomicroscope; 1 50 sec, mag. 40 x; film Kodachrome, KA 135-balanced for flood; lighting incident tungsten, no filters. Photograph by R. R. Bell. Those in the vicinity of the fifth dorsal finlet were free from oil and blisterino: and had clear circ^ili and checks siip'o-pstiiiji' annular forma- tion (Figures 1, 2, 3, and 4) ; thercfoi'(\ oni- samples Avere obtained from a |-inch area below the fifth dorsal liiiht on the left side of the fish. The largest and most symmetrical scales were selected from a sample of 30 or 40 from each fish. These were cU^aued and dry-mounted between glass slides and ])rojccted on a sci'eeii i)rci)are(l witli gi'id lines and an index. At TOO diameters a projected scale could be read dii'ectly to the nearest .01 mm. Attempts to obtain a constant image size to avoid subjectivity in I'eading were discontinued as the nnmb(>r of cir- culi and the scale eharaeter seldom failed to ])rovi(le evidence of the fish size. We could make a good a])pi'oximat ion of the lish length by looking at the ])rojected scale regardless of the image size. Eight scales were examined from each fish, to reduce the ]iossibilit>â of reading false checks as aiuudi. Checks wei-e cousid(>red valid if they ajtpeared on all scales. The most readable scale from each series of (Ught was measui-ed and back calculations of fish lengths at annnlus foi-mation wei-e made. In a subsample of 31 albacore. scales taken from the caudal iieduncle and from Itelow the second dorsal fin liad similar chai"ic1eristics. IJack calculations from the two samjiles were compafable but not in exact. Please note that these imag
Size: 1829px × 1366px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcaliforniadeptoffishandgame, bookauthorcaliforniafish
