Question For Phil

[captmac]

Looked at the survey you pposted and need some claaiafacation on a term used, what is the stock line in reference to? Also thanks for the time and effort you put in to this forum

sorry bout the spelling ha only one cup so far this am

[Phil Lilley]

I emailed Matt for an explanation. I've been told what it is but I can't remember it well enough to be clear.

[captmac]

Thanks for your quick reply and help

[Phil Lilley]

Email from Matt -

Terminology Tip: Fisheries biologists use a parameter called proportional stock density (PSD) to describe the percent of fish collected during a population sample that are over a fixed minimum "stock" size and also greater than or equal to any particular size of interest (relative stock density – RSD). In general, fish smaller than the stock size are hard to collect and including them in percentage calculations could add a lot of unpredictable variability on the percentages.

Example: For largemouth bass populations, the fixed stock size is 8-inches. At Table Rock Lake, a common size of interest is the minimum length limit of 15-inches. The abbreviation RSD(15) refers to the percent of the largemouth bass collected which are at least 8-inches long that are also greater than or equal to 15-inches.

The term "stock" doesn't imply any type of hatchery stocking program or the size of hatchery stocked fish. This holds true for bass, crappie, trout, etc.

[captmac]

Thanks for the come back and thanks once again for your efforts with this forum