I’m back! And, boy was my absence untimely. While I enjoyed soaking up the rays attending the annual meeting of the American Fisheries Society in Florida, I unfortunately missed the Pennsylvania Wild Trout Summit. The PA Fish and Boat Commission was quick to post presentations online, so I’ve been able to catch a few talks (including the one below by my advisor, Ty). But, I’ve also been reading some feedback from a few attendees and my takeaway is that the best talk wasn’t by a platform presenter- it was among members in the audience. One of the reasons I love studying trout is the passionate anglers and citizen scientists that are invested and devoted to wild trout conservation and restoration. There is no other angler base that is as informative and fun to interact with as you all, and I was sad to miss the opportunity.
My other observation is that there was some disappointment in what wasn’t discussed. Most notably, it seems a lot of people in attendance wanted to discuss the state’s trout stocking plans. I’m not surprised. Stocking is controversial and there will probably never be a stocking plan that makes everyone happy. But, I’m also encouraged. The public is trying to voice their opinions on this really complex problem, and, from what I’ve seen, seem to largely understand the delicate balance between the science of native fish conservation and the social dynamics of recreational fishing. It’s not an easy line to walk.
I’m also encouraged because it means there is interest in our current research beyond the scientific community. Our manuscript on native and hatchery fish interbreeding is nearing completion, and the results are getting closer to being released. Until then, I’ve been spending most of my days pouring over manuscripts published over the last 20+ years from other studies of hatchery-wild interbreeding and trying to summarize their findings. From this, I’ve already summarized the pros and cons to hatchery stocking, but I’ve left you in limbo the last two weeks. Overall, do hatcheries have more of a positive or negative effect on wild trout populations? Before I answer that question, there are two caveats. First, I’m only discussing recreational stocking- or stocking done to temporarily increase population sizes to allow for increased angling opportunities. The potential pros and cons to conservation stocking are a bit different. Second, I am only focusing on the hard science. I’m not going to attempt to compare the social benefits of stocking with the impacts to native fish diversity. But, you should. Everyone should weigh the pros and cons and make their own informed decisions about stocking. It’s not my place to make the decision for you, but it is my job to present the science so that you can be informed. We know that stocking increases recreational opportunities and can be an economically profitable business, both of which valuable. Taking that into consideration, I have drawn a line in my mind where I think stocking is worthwhile and where it’s not. You need to find that line without someone telling you where they think you should put it. So, after 20+ years of study, what do we know about the effect of hatchery stocking on wild trout populations?
So, where does that leave us? With a lot of uncertainty. Hatcheries can have negative effects on wild populations. But, not always. And, hatchery interbreeding can be high in stocked populations. But, not always. And, we know that there are long-term negative consequences of interbreeding. But, yet again, not always. We just don’t know. Perhaps a more important question- where does that leave you in your thoughts on stocking?
123 Comments
Steve Szoke
9/3/2017 10:59:10 am
" Where does that leave you in your thoughts on stocking?" I still would rather not have hatchery trout stocked over "good" populations of "real" native brookies . Like class B streams . With that said , What are real native brookies ? As a kid 50-55 yrs . ago I helped my dad and his friend Lou Barrall stock brook trout fry in the small tribs along the Blue mountain in Northampton County . Lou had been doing that for years and I enjoyed catching Lou's brookies . I think he got them from the Fish Commission . Why ? I don't know . How many others did this across the state ? It's still going on thru co-op nurseries . As streams are being restored from AMD damage is nature being allowed to replenish the brookies or is man ? My point is that interbreeding has been occuring for generations and "it is what it is". If stocked trout from a mainstem stream move into tribs . and interbreed with natives or "wild " trout , I guess that's what nature wanted . There is certainly an extremely important place for hatchery trout . To John Arway and Jason Detar , We enjoy catching those beautiful rainbows at Sandy Bottom or spending an hour drifting flies past a ":goldie" as much as a wild brown in the Lil' 'Sock or hiking into Kettle Creek Gorge for the lovely brookies . To all of you out there who care , Keep up the good work , keep up the fight . Loyaltothesock! Steve Szoke
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12/8/2018 08:39:35 pm
Growing your own fish pond can be really difficult. First of all, just like anything, you should have a lot of knowledge and understanding about what you are embarking. You should have a plan and stick with it. Making an outline of the things you have and need to do is really important. This hatchery that you mentioned is something that all aspiring fish growers should know about. I am very thankful for the information that you have imparted on us.
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