Do Fish Survive Streams in Winter?

ScienceDaily has released an article that asks an interesting question: Do Fish Survive Streams in Winter? Anyone who has been somewhere very cold during the winter knows that most small ponds and rivers tend to freeze over – or have large chunks of ice. So how do fish survive without freezing to death – if they do at all – considering they remain in the freezing rivers during the cold months? A team of scientists tagged a fleet of fish to follow during this time. They discovered that “tracked sculpins and young trouts drastically decreased in mid-winter and was low until the ice broke up by which time the number increased again.” Given how the tags were not sensitive to ice-thickness, this could mean they lost the signal, or the young fish were not able to survive the winter, and more were born during the warmer months. They also discovered that health was most important. This makes sense; after all, you are unlikely to survive a harsh winter if you are already sickly as a fish. I also found it strange how the tag signal was ice-thickness dependent; the thicker the ice, the weaker the signal. I also am curious about the young fish, and why they were so hard to find. I also wonder: did they survive?