|...In short, what is the point of the study? Wouldn't it have gleaned more useful data had it been conducted in the winter months when the bulk of stripers are upriver...
|...First question: why measure the fish in centimeters? I understand that this is more "scientific" yet the DFG regulations are NOT in metric...
The population study --- of which this tagging effort is one part --- originated in 1969 and has been on-going ever since. It has demonstrated its utility for monitoring changes in the status of the population.
The population study estimates adult striped bass abundance using mark-recapture calculations, relative abundance using catch-per-effort from tagging and from the CPFV fleet, annual harvest rate and survival rate, growth rate, and addresses migration.
None of those population metrics and behaviors are sensitive to the season when we capture striped bass for tagging. Changing the season when we tag striped bass would not help at all and might confound the interpretation of resulting population metrics.
There are actually fewer adult striped bass up the rivers during winter, so we would probably tag fewer of them if we tagged in winter. We want to tag as many fish as we can for the money.
We'll continue to collect the data in metric and report nets and such in inches (that's is how the manufacturer specifies the material), but for next year's field season report we'll probably convert fish-size to inches for easier interpretation relative to fishing regulations.
Supervising Biologist (Fisheries)
California Department of Fish and Game
Bay Delta Region
4001 North Wilson Way
Stockton, California 95205
Phone (209) 948-3702
FAX (209) 946-6355