As with some of the other illegal introductions, they can be a dual-edged sword. On one hand, they provide another species for anglers that might not be lucky at catching one of the other species already in the lake…like walleyes. On the other hand, they are competing for the available food supply in the lake.
I have fished Deer Creek going back to the 1960’s and have seen it “evolve” through several stages. In the early days it was rainbows, browns and perch as the primary species. But, there were also largemouths. They got to be over 5# and there were plenty of 3 and 4# fish for those who targeted them and knew how to fish for them.
In the early days, Deer Creek was overrun with perch…and crawdads. Baby perch were a major food source for all predators and crawdads fed the bass nicely…and some big rainbows too. In those days perch were considered trash fish and the troutaholics tossed them up on the bank.
**Then…late 70’s to early 80’s “someone” dumped in some walleyes. Not many caught before the mid 80’s but then they took off and became a big factor in the food chain. **
However, the real change in the ecology of Deer Creek came from the mid 80’s planting of smallmouth…by DWR. They exploded and began to vacuum up all the food resources. They quickly began to outcompete the largemouth and greatly reduced the population of perch. Hordes of young smallies mopped up schools of newly hatched perch fry before they could get past the first year. Fewer and fewer perch were living long enough to spawn…and during low water years there was no spawning at all because there was no flooded vegetation for spawning or protective nurseries. Perch fishing went from fantastic to almost nonexistent within a few years of the smallies’ takeover.
The smallies also took the crawdad population from gazillions to scarce. You used to see the bottom crawling with bugs, near any rocky structure. Today you can’t even get enough in a few traps to have a crawdad feed for one person.
Okay…that’s a lot of words to set up the question I have about the “new” species chart in Deer Creek. What are the newcomers going to eat and where is it going to come from?..and as they establish larger populations, what will it do to the “approved” species?
I am cautiously optimistic that the white bass and the crappies may contribute as much as they take…in terms of food. In lakes where they already exist, they spawn prolifically and their young remain small enough…long enough…that the other fish in the lake take advantage of them as a food source.
Example 1: The crappies in East Canyon were largely unknown until the young-of-the-year started showing up by the hundreds in the stomachs of some of the larger trout caught through the ice. All predators in Deer Creek will eat baby crappies…even the adult crappies. I doubt they will have a population explosion. More likely they will establish a minor biomass and will be an “occasional” catch. But, they will get good sized. I caught a 15 incher in there last year…fat and healthy.
Example 2: If the white bass do establish a good spawning population they will also both add to the predation on baby perch and contribute their own young to perch and other species. However, they grow a lot faster than baby perch and will be much larger at the end of the first year. But, they will be good food for the big walleyes and bass in the lake…maybe helping them to grow even larger.
The big unknown is whether or not DC is fertile enough to support that many young of that many species. Virtually all fish spawned in the lake or the tributaries require vast quantities of zooplankton to progress beyond the sac fry stage…and past the fry to fingerling stage. DC has been healthy over the years, but the nutrient levels dropped somewhat after the completion of Jordanelle Dam. The water now coming into DC does not come from a huge upstream drainage and does not have nearly the nutrients it used to. Still, most of the trout caught from DC have large quantities of invertebrates in their innards…like daphnia. If that situation does not go downhill it could be great.
**Time will tell. Time is a tattletail. **