In the Blink of an Eye

Through out the human or animal time line only species that can evovle were able to survive or reproduce to get stronger offspring. As time moved on people became more advance and technology evolved tramendously. People started using big boats with huge nets that are being operated by big boats. During their fishin trips they were able to catch huge amounts of fish from adults to toddlers, but during their separation toddlers most of the time are throwen back. Since their so small its better to throw them back, so they would grow bigger and get more meat, but by keeping only big fish and throwing small ones back that activates fishes survival mode which triggers evolution. They would stop growing big, so fishers would be tricked into thinking that they're toddlers and toss them back. That could be a problem in the future, or maybe not.