West Coast Groundfish Observer Program Manual, Part2 - NOAA

CHAPTER 5
2. Decide how many skates to sample making sure to
sample at least 1/3 of the set.
3. Choose which skates to sample by selecting a set of
random numbers. For example, there are 10 skates
and the numbers 2, 5, 7, and 8 are drawn from a hat
to select the skates to sample.
4. Tally sample the randomly selected skates.
Example of Spatial Sampling
1. The Observer on the Tiny Tim verifies that 10
pieces of rebar with hooks have been set in a
small bay.
2. The Observer decides to sample about ¾ of the
total gear set.
3. The Observer uses a random number table to
select rebars 1, 2, 4, 5, 6, 7 and 9 to sample.
4. The Observer tally samples the randomly selected
rebar gear.
Temporal Sampling
Temporal sampling is time based, therefore, the length of
time it will take to haul a set must be known. The
procedure for temporal sampling is as follows:
1. Verify the length of time needed to haul the set by
asking the skipper or a crewmember.
2. Decide how much of the set to sample making sure
to sample at least 1/3 of the total hauling time for
the set.
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