(Beebe and Vander Pyle, 1944; King and Iverson, 1962; Ahlstrom, 1971, 1972; Barnett, 1983, 1984; 

 Clarke, 1973. 1974. 1983. 1987; Clarke and Wagner. 1976; Hartman and Clarke, 1974; Loeb. 1979. 1980) 

 have expanded our knowledge of the distribution of midwater fishes in these regions. Several broad-scale 

 zoogeographic analyses (Parin, 1961; Ebeling, 1962, 1967; Johnson, 1974, 1982; Willis, 1984; Willis et 

 al., 1988) of north Pacific midwater fishes reveal distinctive faunal boundaries delimiting subarctic, 

 transitional, central, and equatorial faunal groups. 



METHODS AND MATERIALS 



Two types of midwater trawls were used on 7205-JD and 7210-JD: a 6-foot (1.8m) Isaacs-Kidd 

 Midwater Trawl (IK) and a 95-foot (30m) Universal Mark II Midwater Trawl (MT). The IK (Isaacs and 

 Kidd, 1953) was fitted with 2 mm mesh throughout. The MT was somewhat modified from the original 

 design (Jurkovitch, 1968). The wings and body were made of 5-inch (12.7cm) stretch mesh with No. 21 

 thread. The cod end was 3.5-inch (8.9cm) stretch mesh with No. 36 thread and lined with 4 mm mesh. 

 The net was towed with 4.5 x 7.5 foot (1.4 x 2.3m) "V" doors. 



A total of 32 oblique midwater trawls was taken on 19 stations on 7205-JD, from April 21 to June 3, 

 1 972 (Fig. I ; Table 1 ). Most of the stations were located on latitudinal transects extending westward from 

 the CalCOFI lines, which generally are oriented at right angles to the coastline. Four stations were within 

 the CalCOFI grid; the numbers for these inshore stations are those of the CalCOFI pattern, with the line 

 number given first, followed by a dot and the station number (Kramer et al., 1972). CalCOFI station 

 numbers for the Gulf of California include a "G" after the survey line number. The numbers for the 

 offshore stations were derived from the latitude and longitude of the station, with the latitude given first, 

 followed by a dot and the longitude. At each trawl station, an IK was taken with a maximum of 600mwo 

 (mwo=m of towing cable payed out). At station 31.145 the shallow IK was made with 650mwo. On 12 

 of the stations, a deeper tow (lOOOinwo) was made, either with the IK (4 tows) or the MT (8 tows). All 

 trawls were double oblique tows at a ship speed of 3.5 knots (1.8 m/s). Trawl depth was measured with 

 a time-depth recorder and indicated an average maximum depth of 212.1m (range=190-320m; sd=34.0m) 

 for the 600mwo tows. The time-depth recorder malfunctioned on the deep tows on Cruise 7205. 



On 7210-JD, a total of 43 oblique trawls was taken on 24 stations from September 29 to November 17, 

 1972 (Fig. 1 ; Table 2). Eight stations were within the CalCOFI grid and 16 were on the extended transect 

 lines. At each trawl station, an IK was taken with 600mwo and on 17 of the stations a MT trawl was made 

 with 1000m wo. Station 22.143 had only a lOOOmwo MT trawl and the deep tow on station 27.143 was 

 made with an IK. The deep MT tow at station 24.143 had 1200mwo. Average maximum trawl depth was 

 227.5m (range=183-283m; sd=34.0m) for the 600mwo tows and 426.9m (range=3 17-6 10m; sd=67.7m) 

 for the lOOOmwo tows. On both cruises, average fishing time per tow was 43.5 min (range=33-45 min; 

 sd=l.8 min) for the 600 m tows and 74.1 min (iange=42-88 min; sd=9.8 min) for the 1000m tows. Trawls 

 were taken at night on both cruises, except for a few trawls taken at dusk. 



A number of comprehensive taxonomic papers and guides were helpful in the identification of the 

 specimens from the two survey cruises (Allen and Robertson, 1994; Eschmeyer et al., 1983; Fischer et 

 al., 1995; Fitch and Lavenberg, 1968; Garman, 1899; Masuda et al., 1984; Matarese et al., 1989; Miller 

 and Lea, 1972; Moser, 1996a; Okiyama, 1988; Ozawa, 1986a; Smith and Heemstra, 1986; Whitehead et 

 al., 1984, 1986). In addition to these general works, other more circumscribed ta.\onomic publications 

 were useful. The pertinent papers for identification of taxa within a particular family are listed under each 

 family heading in the species list. Explanations or remarks referring to unresolved taxonomic problems 

 are placed below each taxon in the species list. 



