An ever-increasing number of anglers – Not sure this is true. I couldn’t find older data, but the total number of licenses sold in AB seem to be trending the same way as the resource economy in the province and have gone from 280425 in 2014, 318106 in 2015, 312064 in 2016, 309006 in 2017 to 281568 in 2018. I would agree that these numbers don’t necessarily give an accurate measure of how many anglers use the Bow.
The AEP Bow River Fish Population Survey suggests that recruitment of trout stocks is adequate in the Bow River to sustain the population – Fair enough, but this doesn’t reflect the experience of myself and other anglers who have noticed a distinct lack of smaller fish in the river in recent years. It also ties in with the next point;
Unknown fish population and reproduction dynamics – Don’t mean to nitpick, but if the fish population and reproduction dynamics are unknown then how can the AEP Bow River Fish Population Survey suggest that recruitment of trout stocks is adequate in the Bow River to sustain the population? Seems like a chicken/egg debate?
What I would like to know is how closely does the decline of the Bow River’s trout populations resemble the decline of other well known trout rivers in the US that have been exposed to the parasite that causes whirling disease? I doubt the data exists to make a real comparison, but anecdotally it seems all too similar.
My $0.02
Charge a conservation fee/stamp/license to fish the Bow, say $50 a year. Double that for alien/non-resident anglers just for giggles. Put the money directly back in to managing and enhancing the Bow River fishery so that the powers that be can obtain meaningful data and develop targeted solutions.
Some rough data can be obtained just from the license sales, but with this stamp/fee/license include a link to a website (or a paper form, for the technologically challenged) that can be used to voluntarily report how many anglers are using the river, when, where and what the results were with idea of using this data in future management.
As part of the management plan start stocking a strain of Rainbows in the Bow that are naturally resistant to the parasite that causes whirling disease (e.g. Hofer X Harrison strain rainbows) with the goal of augmenting natural recruitment until populations stabilize. The rainbow trout in the Bow were originally from a river in northern California, so maintaining the genetics of the existing stock are kind of a moot point, and the cutties aren’t likely to make a comeback below the Ghost anyway. Colorado hatcheries are raising these rainbows, so obtaining brood stock may be possible without having to reinvent the wheel.