Fish breeders are individuals or businesses that specialize in the reproduction and raising of fish, often for aquariums, ponds, or commercial purposes. They carefully select parent fish based on desirable traits, such as color, size, and health, to produce offspring that meet specific standards. These breeders often create controlled environments, such as tanks or ponds, to ensure optimal conditions for breeding and growth. They may focus on popular species like goldfish, betta fish, or tilapia, and their work contributes to the availability of diverse fish in the pet trade and aquaculture industries.