1) Continue acquisition of long-term biological and physical time series,
2) Conduct acoustic and trawl survey of juvenile walleye pollock for
examining distributions in relation to hydrographic fronts,
3) Collect samples of juvenile pollock for studies of growth, feeding,
pathology, and condition,
4) Conduct hydrological and biological data along monitoring transect
and at mooring sites,
5) Collect midwater and demersal predators upon juvenile pollock,
6) Examine distribution of seabird and marine mammal predators in the
vicinity of the Pribilof Islands,
7) Conduct exploratory midwater trawling in deep water using Russian
midwater trawl.
a) Proceeded to offshore end Line D off St. George Island (Fig. 1) and
began CTD survey heading north. An acoustic transect was done both day
and night on this transect. Tucker tows and Methot, and anchovy trawls
were made along this transect at stations inshore, at and offshore of the
front. Additional sampling with the bottom trawl was done in the Pribilof
Canyon to investigate the fish and invertebrate fauna of this region.
b) Proceeded to the offshore station of Line C on the north side of
St. George. (Fig. 1). Conducted similar physical, biological and acoustic
sampling operations as described previously including trawling for fish
predators. Did intensive sampling on each size of a frontal margin separating
typical Bering Sea water from unusual colored water caused by a massive
coccolithophore bloom.
c) Proceeded to front on Line B south of St. Paul and continued physical,
acoustical and biological sampling as before.
d) Proceeded to Line A north of St. Paul and continued physical, acoustical
and biological sampling as before. Conducted 5 acoustic transects and 5
bottom trawls along this transect in addition to regular sampling.
e) Began Monitoring transect on the morning of 14 September and spent
whole day within the coccolithophore bloom. Conducted intensive sampling
with bongo and Calvet net at Moorings 2, 3, and 4. Strong winds and rough
seas caused us to drop bongo net sampling at several locations.
f) Did an experimental trawl in deep water at the shelf break using
the large Russian rope trawl. Caught mostly adult pollock, squid, and lanternfishes
in this trawl.
g) Proceeded to Dutch Harbor and arrived on the morning of 18 September.
Table 2. Cruise Statistics
