Yea so good question lets look at some reasoning behind my answer and some considerations.
Brown Trout are ranked by the International Union of Conservation of Nature as a top 30 most harmful invasive species on planet earth based on how destructive they are to aquatic ecosystems(species loss, food web shifts ect). There are 4 to 5000 invasive species on planet earth so thats quite a-lot of harm(Himalayan snow trout, New Zealand galaxids, Chilean galaxids, native fish in the mountains of Niger, Zimbabwe, short nose sucker, humpback chub, golden trout, gila trout, apache trout, Lahontan trout, candy darter, guyandotte crayfish, and many many more species). Many of these species are threatened, endangered or at risk of extinction or have been prevented from extinction by invasive brown trout removals. These things make new zealand mudsnails, snakeheads, lantern flies and other invasive species PFBC feels comfortable acknowledging look like the common cold as far as ecosystem ailments.
There are serious concerns about invasive brown trout with many threatened/endangered darters, shiners, and other native fish in PA that are likely harmed but have not been able to be studied. We have evidence that invasive brown and rainbow trout also are very likely harming our state amphibian the Hellbender which is probably going to wind up threatened or endangered in the future.
if you look at where a lot of our conservation dollars go its building habitat for invasive brown trout that does not match a historical reference condition of the stream and the native fish we claim to be protecting. We put in “lunker bunkers” and deep pools with abundant overhead cover that research has shown favor brown trout proliferation to the detriment of native fish assemblages. We waste tens of millions of dollars a year on stocking these invasive trout species which could go to buying PA anglers more access and protecting small mountain communities from having their best streams encroached on my “progress” to an extent.
Brown trout do have some financial and social benefits but I hear a common fear mongering belief that there would just be no good fishing if they were not here which isn’t true. We have to remember there are native fish species they Negatively effect and we would have more biodiverse ecosystems over all if they were not here. People would still be fishing. ,we are just socially conditioned to a particular fish at the moment. There were periods in history when lobster was deemed disgusting and only fed to slaves that built the pyramids, now its $35 at a restaurant. When a young child reels in a silvery, fusi-form, fall fish thats 14” that just put their tackle to the test and some older fishermen says “thats just a chub(even though its a fallfish)” the social conditioning of disappointment with anything but stocked or invasive trout starts as does the devaluation of a great game fish.
I would without a doubt have prevented those brown trout eggs from coming over here if I could have or flip a switch today. Its a no brainer ecologically speaking. The amount of money we have spent and have to yet spend to prevent extinctions from these things is enormous and never factored in to the economics of brown trout.
Now that being said there is no switch. There is no way to get these things out of larger waterways. This is where they live and have taken over, every continent except Antarctica. How worried are we about removing a few of these things from a handful of streams in PA while their on their world domination tour causing loss of biodiversity across the planet?
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This ultimately comes down to if you value your own fishing preferences more or less than conservation of species during our planets sixth global extinction crisis and first human caused one. We put brown trout here their a made impairment just like mine drainage, deforestation, or agricultural. Unlike those industries we don’t even come close to needing invasive brown trout to live happy healthy lives.
Do I love catching them and pursue them with a passion and root for them in their native range and love them as a species and admire them? Yes. I just don’t think what i like to catch justifies extinctions and extirpations. And i would flip a switch for invasive brook trout in Argentina and Switzerland to disappear too.
How about you Frank? You flipping that switch or not.