11-20-2019, 03:20 PM
[quote fuzzyfisher]
how cold is to cold?[/quote]
Anything below 40 degrees is too cold for salmonids.
[quote fuzzyfisher]the Fountain green hatchery says the water from the spring runs at a constant 32.5 degrees all the time and they claim that is the perfect temperature to raise trout? [/quote]
Where is your source? According to the mitigation commission, the Fountain Green spring is a constant 54 degrees F (page 109, second paragraph, second sentence. https://www.mitigationcommission.gov/hat...y_fhpp.pdf
While the water might be cold, they are not raising trout in 32.5 degree F water.
[quote fuzzyfisher]so twin creeks run's colder then 32.5?[/quote] Obviously, no. I'll see if I can find out what it's temperature is -- but I'll wager it's colder than 40 degrees.
most trout spawn in water in the neighborhood of mid-40's. You can easily Google this info. It's not a secret.
[quote Onine Archive of California]
Just as water temperatures which are too warm (higher than 56° F) adversely affect egg development in rainbow and king salmon spawners, so do water temperatures which are too cold (42° F or lower) affect the development and incubation of trout and salmon eggs.
In one experiment in which mature adult king salmon females, nearly ready to spawn, were placed in water ranging from 34 to 38° F, none of the females ripened and all died before spawning.
In an attempt to incubate king salmon eggs at a constant 35° F temperature, mortality was practically 100%. Eggs held at water temperatures of 42.5° F or higher developed with only normal loss. Salmon eggs which have been held in water slightly above 42° F for a period of 6 days or longer could then tolerate colder temperatures without excessive mortalities. It is safe to say that the eggs of rainbow trout and king salmon will not develop normally in the fish if constant water temperatures above 56° F are encountered. It also follows that both rainbow trout and king salmon eggs cannot be incubated in water below 42° F without excessive loss.
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Twin Creeks has always had fish run up it to spawn. But that doesn't mean that they are very successful. Historically at Fish Lake the majority of natural recruitment comes from the lake itself or from Lake Creek.
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how cold is to cold?[/quote]
Anything below 40 degrees is too cold for salmonids.
[quote fuzzyfisher]the Fountain green hatchery says the water from the spring runs at a constant 32.5 degrees all the time and they claim that is the perfect temperature to raise trout? [/quote]
Where is your source? According to the mitigation commission, the Fountain Green spring is a constant 54 degrees F (page 109, second paragraph, second sentence. https://www.mitigationcommission.gov/hat...y_fhpp.pdf
While the water might be cold, they are not raising trout in 32.5 degree F water.
[quote fuzzyfisher]so twin creeks run's colder then 32.5?[/quote] Obviously, no. I'll see if I can find out what it's temperature is -- but I'll wager it's colder than 40 degrees.
most trout spawn in water in the neighborhood of mid-40's. You can easily Google this info. It's not a secret.
[quote Onine Archive of California]
Just as water temperatures which are too warm (higher than 56° F) adversely affect egg development in rainbow and king salmon spawners, so do water temperatures which are too cold (42° F or lower) affect the development and incubation of trout and salmon eggs.
In one experiment in which mature adult king salmon females, nearly ready to spawn, were placed in water ranging from 34 to 38° F, none of the females ripened and all died before spawning.
In an attempt to incubate king salmon eggs at a constant 35° F temperature, mortality was practically 100%. Eggs held at water temperatures of 42.5° F or higher developed with only normal loss. Salmon eggs which have been held in water slightly above 42° F for a period of 6 days or longer could then tolerate colder temperatures without excessive mortalities. It is safe to say that the eggs of rainbow trout and king salmon will not develop normally in the fish if constant water temperatures above 56° F are encountered. It also follows that both rainbow trout and king salmon eggs cannot be incubated in water below 42° F without excessive loss.
[/quote]
Twin Creeks has always had fish run up it to spawn. But that doesn't mean that they are very successful. Historically at Fish Lake the majority of natural recruitment comes from the lake itself or from Lake Creek.
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