748 



Fishery Bulletin 100(4) 



JR GR PR RR SR YR LC ST SF DS RS 



JR GR PR RR SR YR LC ST SF DS RS 



Fish species 



Figure 7 



Fish densities (mean ±SE) for each habitat patch calculated from all transects con- 

 tained within each patch. JR = juvenile rockfish iSebastes species); GR = greenstriped 

 rockfish tSehastes elongatus); PR= pygmy rockfish iSebastes wilsoni); RR = rosethorn 

 rockfish iSebastes helvomaculatus); SR = sharpchin rockfish iSebastes zacentriis);YVi - 

 yellowtail rockfish iSebastes flavidus); LC = lingcod iOphiodon elongatus); ST = short- 

 spine thornyhead iSebastolobus alascanus): SB = sablefish iAnoplnpoina fimbria ); DS = 

 Dover sole iMicrostomus pacifictis). and RS = rex sole iE. zachinis}. 



striped rockfish, and pygmy rockfish. Juvenile rockfish 

 were found predominantly in rock-ridge habitats, and 

 found in substantially high density (25,577 |±65211 fisli/ 

 hectare) in patch C as compared with the other rock ridge 

 patches (patch A 1140 |±536| fish/hectare and patch F 

 4709 [±5309] fish/hectare). Both Dover sole and rex sole 

 were associated with mud habitat, and both were found 

 in higher densities in patch D (Dover sole — 312 |±33| 

 fish/hectare, rex sole — 143 |±18| fish/hectare) than patch 

 H (Dover sol— 217 |±29| fish/hectare, rex sole— 24 |±141 

 fish/hectare). Pygmy rockfish were found in high density 



in mixed substrate patches B and F (12,435 |±3392] fish/ 

 hectare and 12,119 [±3531] fish/hectare) but at a substan- 

 tially lower density in patch G (3236 |±81| fish/hectare). 



Among all eight patches, the species found in the highest 

 abundance overall were juvenile rockfish and pygmy rock- 

 fish, and those in the lowest abundance were lingcod and 

 sablefish (Table 1). The total area of all habitats assessed 

 was 124 km-, which is approximately 17'7f of the total area 

 of the sonar survey, and the total number of estimated 

 fish and standard error for that area was 156,598,000 

 ±16,854,000. The coefficient of variation was relatively low 



