Fuzzy – Tiger Musky were planted in Johnson Res. There is a diversion in the stream between the two lakes to try to prevent fish from moving from one lake to the other. This doesn’t stop all fish (as we already know). There were a very limited number of Musky stocked in Johnson Res. How many do you think actually showed up in Fish Lake? Not very many. They are also sterile, which means that they will not reproduce. So, let me ask you a question. How many do you think showed up in Fish Lake? maybe 100? I doubt that many. How much effect do you really think those fish will do to a population of chubs (which are already desimated, so lets use perch)? I can’t see any effects at all.
But, the report is on the Lake trout population, not the chub, perch, or musky population…so all of that is just my own opinion…
Here is the abstract from the study that was done from 1989-2002. It was released in 2003:
"
Fish Lake is one of the most popular sport fisheries in the state, supporting three resort marinas and drawing thousands of anglers annually. Lake trout (Salvelinus namaycush) were first stocked in Fish Lake in 1900, and while other species are more readily caught, the possibility of catching a trophy fish draws many anglers to the lake each year. Concern about the status and future of the lake trout population arose when a decline in the abundance of forage fish became apparent in the mid-1980s. The catch of Utah chubs (Gila atraria) and rainbow trout (Oncorhyncus mykiss), the traditional forage of lake trout in Fish Lake, declined to their lowest recorded levels in the early 1990s. As a result, a study was initiated to determine the cause of these declines and document the current status of the lake trout population. Estimates of lake trout abundance, exploitation, growth rates, and food habits were generated. Lake trout in Fish Lake are relatively abundant, while primary forage species (Utah chub and rainbow trout) are limited. Chub numbers declined following an illegal introduction of yellow perch, and rainbow trout are limited by annual stocking. Smaller lake trout (<20 inches) consume primarily aquatic insects, while larger individuals (>20 inches) convert to a fish diet (primarily rainbow trout). However, it is clear that many lake trout do not convert to a fish diet and remain smaller sizes compared to their piscivorus counterparts. In addition, smaller lake trout exhibited low condition, while larger fish displayed high condition. The relatively high number of lake trout and limited forage created a bottleneck where few fish are found between 21 and 28 inches. To reach larger sizes, lake trout must convert to a piscivorus diet. Individual fish that squeeze through this bottleneck quickly grow to trophy size. However, many smaller lake trout remain on invertebrate diets for their entire lives, some reaching old age…"
coincidentally, last weekend (20th of March) I caught an 18" Lake trout from Fish Lake. It had a right pelvic fin clip. I inquired about the fin clip out of curiosity. I was told that the righ pelvic clipped lake trout in Fish Lake are about 11 years old…a 19" fish that was over 11 years old!! I was also told that there are many 40" right pelvic fin cipped lake trout in
Fish Lake that are the same age…some fish just never make the transition. Would this be an easier conversion if perch were not in the lake, and chubs were plentiful?
I attached a pdf file showing the diets of lake trout sampled…very interesting…