The camera was equipped with a 35-mm f2.5 Nikkor lens combined with a 
35-mm closeup lens outfit and a rectangular quadrat frame (13 x 18.5 cm). 
As noted for the line-transect census, all faces and levels were located 
without reference to the attached biota. 
Photographs were analyzed in the laboratory using a slide projector 
and a screen with 50 computer-generated random points. One of 10 
different screens was selected by random number for analysis of slides 
from each level. Actual rock surface area examined in each slide was 
100 cm2 for the north jetty stations and 150 em? for the south jetty 
stations. Organisms occurring under the 50 points in each photograph 
were identified, and percent cover estimates for each species, based on 
the proportion of points occupied, were calculated for each level (i.e., 
250 points/level). Photographic analysis differed slightly from line- 
transect analysis. Blue-green algae were not assessed in photographs 
since they could not always be detected, even when present. Furthermore, 
when there was uncertainty about whether biota existed under a point in 
the photographs (due to shadows, poor picture quality, etc.), that 
point was discarded and percent cover estimates were based on the number 
of analyzable points only. 
c. Suction Samples 
Motile epifaunal invertebrates were sampled using a modified 
underwater slurp gun. The levels sampled were +1 m, MLW, -1 m, and -2 
m at all stations, except at the inner stations on each jetty, where 
shallow depths precluded collection at the -2-m level. Three replicate 
samples were obtained at all levels by placing the opening of the slurp 
gun (4-cm diameter) flush against a rock face and vigorously pulling 
the suction rod. Each replicate consisted of five suctions pooled from 
different rock faces picked haphazardly. The gun was modified so that 
suction was obtained by venturi action; incoming water through holes 
drilled in the barrel was filtered through a l-mm mesh screen. Contents 
of the slurp gun were emptied into a gallon jug after each suction. To 
prevent loss of organisms, the mouth of the jug was covered by a 1-mm 
mesh screen having an opening just large enough to permit insertion of 
the slurp gun barrel, and the jug was capped except when collections were 
being added. After the five collections comprising each replicate had 
been placed in the jug, the container contents were sieved through a 
1-mm mesh screen and preserved in a 10% formalin seawater solution. Due 
to some water leakage around the mouth of the gun and rock face during 
the suction stroke, the exact surface area sampled per replicate was not 
defined but approximated 65 cm2. 
d. Fish Observations and Collections 
Qualitative observations on ichthyofauna were made during 
investigations of benthic flora and fauna on the jetty. Fish species 
observed near the jetties by scuba divers were recorded, baited blackfish 
traps were set at various locations on the jetty, and a beach seine was 
pulled along the western side of the weir. In addition, fish species 
were recorded from gill net collections made in conjunction with a related 
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