Trawling has been conducted at Chipps Island (SB018X) since 1976, in most
years from April through June during peak fall run outmigration, but
is now planned for year round to monitor all races of chinook using mark and recapture and to collect information
on other anadromous species such as American Shad.
Crew - one boat operator and two deckhands
Net - 4.6m by 9.1m with a cod end mesh size of 0.64cm
Sampling effort - ten 20 minute trawls per day, three
to seven days per week (seven days per week during coded
wire tagged fish recovery periods)
The midwater trawl survey at Sacramento (SR055X) is used to estimate the
relative abundance and timing of fry and smolts entering the delta.
Knowing when and at what size the various races enter the Delta is
helpful in implementing water project protective criteria.
History - this trawl has been deployed at Sacramento since 1988
(in 1990 the site was near Hood) and near Clarksburg on the Sacramento
River from 1976 to 1981. Again, past years have emphasized
the April to June months when fall run outmigration occurs, but since
1992, this sampling season has been expanded.
In December, 1994, this gear was experimentally replaced by the kodiak trawl.
Vessel - 7.3m V8 inboard/outboard gas powered center console boat
Crew - one boat operator and two deckhands
Net - 1.8m by 4.6m with a cod end mesh size of 0.32cm
Sampling effort - ten 20 minute trawls, three to five days per week
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