The round goby, a small fish, has been making waves in North American waters since the 1990s. It first appeared in the Great Lakes and has since journeyed eastward, reaching the Hudson River Estuary in 2021. Scientists wanted to understand how this fish handles saltwater, especially as it moves into more saline environments. They tested how well round gobies tolerate...

Fish can be very sensitive to changes in their environment. Two types of fish, Colossoma macropomum and Piaractus brachypomus, were put through a temperature test. This was to see how their bodies reacted to a sudden drop in temperature, followed by a return to normal. The fish were kept in water that was suddenly cooled from 28. 7°C to 18. 6°C. This was done for...