10-25-2013, 12:24 AM
I found the article on Lake trout in western lakes. It discusses why lake trout reproduction is low in Bear Lake. Very little natural reproduction in the lake .http://www.flatheadtu.org/indexFiles/WebDocs/LT2.pdf
" However, lake trout continue to be stocked because reproductive success is apparently low due to egg predation, limited spawning habitat, and a unique
water chemistry that precipitates calcium carbonate, suffocating
lake trout eggs deposited in rocky substrate." The article stats that Utah and Idaho started planting sterile lakers and fewer of them to aid in population control.
recruitment as well.
"Although lake trout had been stocked in Bear Lake at a
higher rate for over 90 years without developing a naturally
(434 Fisheries • vol 34 no 9 • september 2009 • www.fisheries.org)
recruiting population, the frequency of lake trout stocking and
the number stocked have been reduced, The stocking rate was
reduced to an average of 0.25/ha/y from 1990 to 2006 (Nielson
and Tolentino 2002; Tolentino 2007a) despite bioenergetic
simulations of predation by lake trout under different stocking
rates that projected that Bear Lake could support an annual
rate up to 0.6/ha (Albrecht et al. 2004). This lower stocking
rate has reduced the number of lake trout in the lake based on
lower catch rates of lake trout in standardized gill net sampling.
Further, as a compromise to eliminating lake trout stocking in
Bear Lake, Utah and Idaho agreed to stock only triploid lake
trout. Effort began in 2000 to produce sterile lake trout (Bill
Horton, IDFG, pers. comm.) using pressure treatment of fertilized
eggs to produce triploid lake trout (Kozfkay et al. 2005).
Future work will evaluate the fishery performance of triploid
lake trout compared to previous years when diploid lake trout where stocked"
Read the study it is interesting about lake trout populations.
[signature]
" However, lake trout continue to be stocked because reproductive success is apparently low due to egg predation, limited spawning habitat, and a unique
water chemistry that precipitates calcium carbonate, suffocating
lake trout eggs deposited in rocky substrate." The article stats that Utah and Idaho started planting sterile lakers and fewer of them to aid in population control.
recruitment as well.
"Although lake trout had been stocked in Bear Lake at a
higher rate for over 90 years without developing a naturally
(434 Fisheries • vol 34 no 9 • september 2009 • www.fisheries.org)
recruiting population, the frequency of lake trout stocking and
the number stocked have been reduced, The stocking rate was
reduced to an average of 0.25/ha/y from 1990 to 2006 (Nielson
and Tolentino 2002; Tolentino 2007a) despite bioenergetic
simulations of predation by lake trout under different stocking
rates that projected that Bear Lake could support an annual
rate up to 0.6/ha (Albrecht et al. 2004). This lower stocking
rate has reduced the number of lake trout in the lake based on
lower catch rates of lake trout in standardized gill net sampling.
Further, as a compromise to eliminating lake trout stocking in
Bear Lake, Utah and Idaho agreed to stock only triploid lake
trout. Effort began in 2000 to produce sterile lake trout (Bill
Horton, IDFG, pers. comm.) using pressure treatment of fertilized
eggs to produce triploid lake trout (Kozfkay et al. 2005).
Future work will evaluate the fishery performance of triploid
lake trout compared to previous years when diploid lake trout where stocked"
Read the study it is interesting about lake trout populations.
[signature]