Barber et at: Demersal fish assemblages of the northeastern Chukchi Sea 
201 
170° 155° 
170° 
155° 
Figure 2 
Relative abundance ([number/km 2 ] x 10 3 ) and biomass (g/km 2 ) estimates 
of demersal fishes at 48 and 16 stations sampled during 1990 and 1991, 
respectively, in the northeastern Chukchi Sea, Alaska. 
In 1991, abundance and biomass estimates were 
low over the entire study area and there was no trend 
towards greater abundance or biomass in the south- 
ern area (Fig. 2). At the eight stations sampled in 
both 1990 and 1991, biomass and abundance esti- 
mates differed widely between years (Table 2). For 
example, at station 22, B. saida was 2.4 times as 
abundant in 1990 as in 1991, and H. robustus was 
23 times as abundant in 1991 as in 1990. 
Species richness and diversity 
Families contributing the most species were Cottidae 
(21), Zoarcidae (10), Pleuronectidae (8), Stichaeidae 
(6), and Agonidae (5) (Table 1). Ten families contrib- 
uted only 16 additional species. Fifty-five percent of 
the species were represented by less than 10 indi- 
viduals and some 45% were represented by a single 
specimen. 
