The amazing moment when two grayling fish procreate can be seen in this short clip. The man who filmed it was fascinated by studying fresh water fish procreation. For several years, he had attempted to find and film them how they procreate. After three years, he was finally successful, catching these two graylings on tape.
Fish have developed very interesting ways of procreation. Some fish need to drink some liquid for procreation, while others spawn on land; there seems to be no limit to the variety of methodologies used in fresh water fish spawning.
Watch this video to find out how grayling fish can manage to procreate on the river bottom: