Hi Maruf,

Fish usually swim against the current for various reasons. One of the reasons is to locate food, as struggling against the water's flow can take them to areas with more food sources. Additionally, some fish swim against the current to reach their spawning grounds, where they can reproduce. Some fish make long journeys, and swimming upstream helps them reach their destination. By swimming against the flow, they can go upstream to where they lay eggs or return to their starting point. Fish create territories for breeding or finding food, essential for protecting their home.