Figure 2.— Length-frequencv distribution of Arctic cod caught in 

 the northeastern Chul^chi and western Beaufort Seas, August- 

 September 1976 and 1977. 



10 12 



TOTAL LENGTH Ccm) 



Table 4.— Mean and range of length (FL) at various ages for Arctic cod in this and other studies. 



'See tbolnote 2 in text. 



Table 5. — Foods from stomachs of 157 Arctic cod collected in offshore waters of 

 the northeastern Chukchi and western Beaufort Seas during August-Septem- 

 ber 1977. 



cm represented individuals 2+ yr old. The largest individual 

 caught (24.5 cm) was probably 5 + yr old. 



Ovaries of specimens < 15 cm contained only small ( < 1 mm) 

 eggs while those of individuals 15.5 cm and longer contained eggs 

 of two or three size classes. Eggs of the largest size class ranged 

 from 2.7 to 4.5 mm in diameter The ovaries of individuals 15.5 and 

 18.9 cm long contained 66 and 135 "large" eggs, respectively, and 

 the gonads made up 8.2 and 19.2% of the body weight. These mea- 

 surements correspond closely with those of Andriyashev (1954). 

 This species probably spawns in fall or early winter 



In 74 stomachs examined, 9 were empty and 12 contained only 

 unidentifiable food remains. Of the stomachs containing identifi- 

 able food, gammarid amphipods occurred in 27, polychaete worms 

 in 12, cumaceans and caprellids each in 4, and isopods, mysids, 

 shrimp, bnttle stars, and Arctic cod in 1 stomach each. 



Icelus Ajcorm's.— Seventy-four twohorn sculpins were caught 

 during the 1977 survey. Only two were caught in the 18 tows made 

 west of Prudhoe Bay. A total of 49 were caught at three stations (24, 

 25, 28), indicating patchy abundance. These sculpins occurred at 

 stations ranging from 50 to 130 m. The three stations of abundance 

 were in 105-1 10 m. 



Twohorn sculpins ranged in length from 3.0 to 7.0 cm TL (Fig. 

 4). Most specimens >6 cm were females (20 of 23) and most <6 

 cm were males (33 of 47). Sexual dimorphism in size is not uncom- 

 mon in sculpins (Andriyashev 1954). Such differences in size may 

 be due to faster growth or differential survival of females. Nine of 

 1 1 individuals 5 yr or older were females. The length-weight rela- 

 tionship was similar for males and females although there was a 

 tendency for females with well-developed ovaries to fall above the 

 indicated line. That relationship is described by the equation 

 W= 0.0082L' '* (Af = 71 , /■ = 0.955). Length at a given age varied 

 widely; however, the mean length of fishes increased about 2 mm/ 

 yr from the age of 3 to about 5 yr old. Eight 3 -I- -yr-old fish aver- 

 aged 5.45 cm (range 4.6-6.3, SD = 0.583), ten 4-l--yr-old fish 



