Tell me what the meaning of your online name is?

There is a saying in southern Fujian: "Freshwater fish run into saltwater pools and die." This means that different environments lead to different encounters. Although freshwater fish are good swimmers, they will only die in saltwater pools (referring to the sea). This also reminds mainland swimmers of the great dangers lurking in swimming in the sea. Because I like to swim in the sea, I chose the online name "Saltwater Fish".