In addition, numerous streams are closed to trespass for a portion of their length. However, the survey teams usually estimated the percent of the length of each stream which was open to public fishing. Land ownership information was not found for 18 cases. Trout abundance None of the Class A brook trout populations is static. The number of brook trout of any size in any stream fluctuates from year to year.
Some populations are subject to wide variations in abundance.
This may be especially true in streams which are subject to substantial variation in flow, periodic acidification, and predation by humans and other animals. We should also remember that the number of trout in any given stream is not fully known, it is estimated. The techniques used in calculating the trout population estimates mentioned here are widely accepted as being quite reliable, efficient, but imperfect. While the estimates cited here should not be considered the last word on the brook trout populations discussed, I consider them to be good data, as well as the best data available. I am not aware of any conclusive answer for that question.