West Coast Groundfish Observer Program Manual, Part2 - NOAA

CHAPTER 6
8. The Observer asks the gaff-man to land the second
Pacific halibut that comes up during the non tally
period. He records the length and viability of this
fish.
9. The Observer then asks the gaff-man to land every
10 th Pacific halibut caught thereafter and takes
lengths and viabilities on all of them (the population
in this case is every 10 th fish, beginning with fish #2).
10. The viabilities will be recorded on the Biological
Specimen form with a sample method of 7 –
Outside and Random.
Non-Random Sampling
The only time that fish should be selected in a non-random
fashion is when biological information is being collected from
tagged fish. Tagged fish may be taken from either inside or
outside of a species composition sample.
A tagged fish has been collected non-randomly if either of the
following apply:
• The tagged fish is NOT part of a species composition
sample or a random sample taken from outside the
species composition.
• The tagged fish is within a species composition sample
but is NOT part of a random sample for biological
specimens.
6-12 1/30/2004