FISHERY BULLETIN: VOL. 75, NO. 1 



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TABLE 2. — Egg diameter and fecundity of Dover, rex, and petrale 



sole. 1 



Species 



Egg diameter 



No. eggs/female 



Dover sole 

 Rex sole 

 Petrale sole 



2.04-2.57 mm 

 1.98-2.34 mm 

 1.21-1.25 mm 



51,900 at 42.5 cm 

 265,800 at 57.5 cm 

 34,191 at 36 cm 

 238,144 at 59 cm 

 400,000 at 42 cm 

 1 ,200,000 at 57 cm 



1 Data from Hagerman 1 952; Harry 1 959; Alderdice and Forrester 1971; Hart 

 1 973; Hosie 1 975; Ahlstrom and Moser 1 975; JR. Dunn and N. A. Naplin pers. 

 commun. 



may affect survival and subsequent year-class 

 strengths of these species which are known to be 

 variable (Demory and Hosie 6 ). 



COLLECTIONS 



We examined the catches of 593 bongo net tows 

 and over 2,200 Isaacs-Kidd Midwater Trawls 

 taken off Oregon to provide information on the 

 distribution, dispersal, and length of larval life of 

 these three species. The bongo nets had 70-cm 

 mouth diameters with 0.57 1-mm mesh nets. Tows 

 were made obliquely through the water column 

 from the bottom or 150 m to the surface at a speed 

 of 2-3 knots. Two data sets were examined. One set 

 consisted of 287 samples collected on an east- west 

 transect off Newport, Oreg., at stations 2, 6, 9, 18, 

 28, 37, 46, 56, 65, 74, 93, and 111 km from the coast 

 (Figure 1). Samples were taken every month from 

 January 1971 to August 1972 except January and 

 February 1972. The other set consisted of 306 

 samples collected along 12 transects between the 

 Columbia River and Cape Blanco, Oreg., with 

 stations located 2, 9, 18, 28, 37, 46, and 56 km from 

 the coast. Samples were taken in March and April 

 1972 and 1973, and March 1974 and 1975. Not all 

 stations were sampled on each cruise. 



Isaacs-Kidd Midwater Trawl collections were 

 made with trawls having a mouth width of 1.8, 2.4, 

 and 3.1 m, a 5-mm (bar measure) mesh, and a 

 0.5-m diameter cod end of 0.571-mm mesh at 

 stations 28, 46, 84, and 120 km offshore (Figure 1). 

 Stations from 158 to 306 km offshore (at 37-km 

 intervals) were sampled less frequently. Tows 

 were mainly taken along four transect lines 

 perpendicular to the coast (Figure 1) during 



6 Demory, R. L., and M. J. Hosie. 1975. Resource surveys on the 

 continental shelf of Oregon. Fish Comm. Oreg., Annu. Rep. July 

 1, 1974 to June 30, 1975, 9 p. 



174 



