where R = total number of revolutions of the current meter 

 during the haul 



a = area (m^) of the mouth of the net 



p = length of column of water (m) needed to produce one 

 revolution of the current meter. 



Tow depth, volume of water strained, and standard haul factor are 

 listed in Table 1 for each tow taken during 1984. Detailed 

 descriptions of factors involved in calculating these values are 

 presented in Ahlstrom (1948), Kramer et al. (1972), and Smith and 

 Richardson (1977) . 



IDENTIFICATION 



Identification of ichthyoplankton species beyond those 

 separated during the sorting process was done by a separate group 

 of specialists. Ontogenetic stages of fishes are inherently 

 difficult to identify, and this is further complicated by the large 

 number and diversity of species which contribute to the 

 ichthyoplankton of the California Current region. Most 

 identifications were accomplished by establishing ontogenetic 

 series on the basis of morphology, meristics, and pigmentation, and 

 then identifying these series by relating them to known 

 metamorphic, juvenile, or adult stages with overlapping features 

 (Powles and Markle, 1984) . A total of 135 taxa was identified for 

 1984: 90 to species, 22 to genus, 18 to family, and 5 to order or 

 suborder. In 1981 four species of Sciaenidae were identified for 

 the first time: Cheilotrema saturnum, Genyonemus lineatus, Roncador 

 stearnsii , and Seriphus politus. Another sciaenid, Atractoscion 

 nobilis, was identified for the first time in CalCOFI samples in 

 1984, as was the anotopterid, Anotopterus pharao. In 1984 all 

 larvae of Citharichthys were identified to species, whereas in 

 1951-1953 and 1961-1981 only large specimens of C. stigmaeus were 

 identified to species (Sumida et al., 1987a; Ambrose et al., 

 1988d) . 



Other identification caveats are as follows: 



Engraulis mordax - some nearshore samples of small E. mordax may 

 contain other anchovy genera which could not be 

 differentiated. 



Bathylagus spp. - includes small and/or disintegrated specimens 

 of Bathylagus or Leuroglossus stilbius. 



Lampanyctus regalis - underrepresented because of inability to 

 differentiate small larvae (<5 mm) from those of other 

 Lampanyctus species; counts may include other species of this 

 large and complex genus. 



