Bull Trout Water Temperature

F are lethal to salmon and steelhead and genetic abnormalities or mortality of salmonid eggs can occur above 11.

Bull trout water temperature. Mean water temperatures in the study ranged between 52 and 146C. Bull trout begin to spawn in the late part of August or early September and often lasting through October Bjornn 1991. They typically spawn in water temperatures below 9 degrees Celsius 48 degrees Fahrenheit.

Many spawning areas are in areas with cold water springs or areas where streamflow is aided by groundwater. Many laboratory studies have shown that elevated water temperatures can have a number of negative effects on salmonids. They require the cleanest stream substrates for spawning and rearing.

Cumulative temperature units were similar among the downstream distribution limits of bull trout in three of the four streams. 19122019 This trout reaches sexual maturity at between four and seven years of age and are known to live as long as 12 years. For brook trout these limits are generally accepted to be a few degrees lower some sources suggest as low as 65.

They spawn in the fall after temperatures drop below 48 degrees Fahrenheit. Understanding currents and the movement of water helps as does. Spawning times for specific populations is governed largely by water temperature.

The fish can also interbreed with the brook trout in areas introduced. The upper incipient lethal temperature for bull trout was found to be 21C whereas the optimal temperatures for growth were in the range of 10-15C. Generally however spawning activities are triggered when the water temperature drops below 10 degrees Centigrade Bjornn 1991.

Females dig nests in the gravel during spawning. Bull trout were always present where mean temperature was less than 100C were present at 40 of the sites where mean temperature was between 100 and 120C but. Bull trout require colder water temperature than most salmonids.