Industrial fishing has dramatically decreased marine biodiversity since the 19th century. The fishing industry involves catching fish through commercial fishing or fish farming. Commercial fishing catches fish from wild fisheries using nets, lines, or traps, while fish farming raises important species like carp, salmon, tilapia, and catfish in tanks. Once caught or raised, fish are processed which includes preservation, waste management, and handling before being marketed, traded internationally, and managed financially for future sustainability and opportunities.