. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Systematics and Biology of Peprilus • Horn 231. Latitude Figure 40. Relative regional abundance of larvae of Peprilus simillimus according to CALCOFI collections, 1955-59: 3 zz southern California; 4 zz northern Baja California; 5 ~ upper central Baja California; 6 zz lower central Baja Cali- fornia; 7 zz southern Baja California. The number of larvae per 10 square meters of sea surface is an estimate calculated from standard haul totals. See Figures 39 and 41. areas as Washington and British Columbia. The species rem
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Systematics and Biology of Peprilus • Horn 231. Latitude Figure 40. Relative regional abundance of larvae of Peprilus simillimus according to CALCOFI collections, 1955-59: 3 zz southern California; 4 zz northern Baja California; 5 ~ upper central Baja California; 6 zz lower central Baja Cali- fornia; 7 zz southern Baja California. The number of larvae per 10 square meters of sea surface is an estimate calculated from standard haul totals. See Figures 39 and 41. areas as Washington and British Columbia. The species remains to be of commercial importance only in California and mainly from Monterey to San Pedro. Surface currents probably influence the extent of the northern distribution of P. simillimus. The data on the occurrence of this species in Washington and British Columbia are all similar in that the ma- jority of captures are in the winter months, November through February, and that the size of the fish captured has been 150 mm FL or more. During the season of upwell- ing on the California coast (approximately March to July) a countercurrent (counter to the southward-flowing California Cur- rent) that contains considerable quantities of equatorial water flows close to the coast at depths below 200 m (Sverdrup, John- son, and Fleming, 1942). In the fall up- welling ceases, and in the surface layers S 500 ° 300 M J J A Months, 1955-59 Figure 41. Cumulative monthly catch of larvae of Peprilus simillimus off the coasts of California and Baja California made by CALCOFI survey cruises, 1955-59. See Figures 39 and 40. a countercurrent develops, the Davidson Current, which in November, December, and January flows northward along the coast to at least latitude 48°N. This latter current may particularly influence the movements of P. simillimus. Individuals may follow this current northward, and this may at least partially explain the captures of this species in northern areas in the winter
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