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hatchery . worldwide, the most important fish species produced in fish farming are carp , tilapia , salmon , and catfish . [ ] demand is increasing for fish and fish protein, which has resulted in widespread overfishing in wild fisheries . china provides % of the world's farmed fish. [ ] as of , more
pond water with artificial fertilizer mixtures, such as potash , phosphorus , nitrogen , and microelements. another issue is the risk of algal blooms . when temperatures, nutrient supply, and available sunlight are optimal for algal growth, algae multiply at an exponential rate, eventually exhausting...
https://en.wikipedia.org/wiki/Fish_farming