How are fish harmful?

Fish can be harmful in several ways, particularly when they are contaminated with pollutants like heavy metals, PCBs, and microplastics, which can pose health risks to humans and wildlife when consumed. Additionally, invasive fish species can disrupt local ecosystems by outcompeting native species for resources, leading to a decline in biodiversity. Overfishing can also threaten fish populations and the overall health of marine ecosystems. Lastly, fish farming can contribute to water pollution and the spread of diseases among wild fish populations.