When food enters the small intestine, bile travels through the common bile duct to reach the duodenum. Gallstones are hard deposits that form inside the gallbladder when there is too much bilirubin or cholesterol in the bile.
That said, there is a considerable consensus that all three major trout species (brook, brown and rainbow) begin to experience some level of stress at around 68Â°F (20Â°C), with that stress increasing rapidly as the temperature rises further.
An interesting fact is that although rainbow trout spawn later than other New York trout species, their eggs still hatch at about the same time in the spring. This is because the amount of time required for fish eggs to develop depends on the water temperature. Eggs develop faster in warm water than in cool water.