. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. LONGLTNi: riSIIIX.; FOR Tl.'NA 145 NB SCOFIELO CRUISE 55S-5 SEPT-NOV 1955. S& FIGURE 8. Temperature depth profiles of the eastern and central tropical Pacific from N. 8. Scofield Cruises 55-S-5 and 56-S-l and Pacific Oceanic Fisheries Investigations Cruise 2 of the Hugh M. Smith, 1950 (Central Pacific data from Cromwell, 1950). Latitudinal separation of these two species (Figure 10) may be ex- plained by the yellowfin's preference
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. LONGLTNi: riSIIIX.; FOR Tl.'NA 145 NB SCOFIELO CRUISE 55S-5 SEPT-NOV 1955. S& FIGURE 8. Temperature depth profiles of the eastern and central tropical Pacific from N. 8. Scofield Cruises 55-S-5 and 56-S-l and Pacific Oceanic Fisheries Investigations Cruise 2 of the Hugh M. Smith, 1950 (Central Pacific data from Cromwell, 1950). Latitudinal separation of these two species (Figure 10) may be ex- plained by the yellowfin's preference for warmer water. Tester (1956) reported a relationship between surface temperatures and yellowfm longline catches in the central Pacific. Temperatures cooler than 77 degrees F. resulted in a marked drop in the catch. If the deep swim- ming yellowfin in the eastern Pacific are also associated with surface temperatures, the cool waters of the equatorial area probably have an effect on their occurrence throughout much of the year. Tuna catches were centered in general areas of high zooplankton abundance, but no correlation was evident at individual stations. The absence of bigeye in the longline catches north of Lat. 02° N. is difficult to explain. The absence is also conspicuous in the com- mercial surface fishery of this area. Nakamura (1949) states that bigeye are thought to occur at deeper levels than the other tunas. Based on this concept, low oxygen concentrations in the deep water north of 2—11779. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game. [San Francisco, etc. ] State of California, Resources Agency, Dept. of Fish and Game
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