Final answer:
Aquaculture hazards encompass chemical pollution, water contaminants, parasites, and mycotoxins, which can derive from various sources and have widespread environmental and health impacts. Therefore, the correct option is D.
Step-by-step explanation:
The hazards associated with aquaculture include chemical pollution, contaminants in water, the presence of parasites, and mycotoxins. These hazards can originate from a variety of sources such as untreated sewage, industrial waste, and the introduction of non-native species used in aquaculture that may bring with them additional diseases or parasites. Moreover, the application of pesticides in agriculture and pollutants like mercury can accumulate through the food chain and ultimately affect human health, as well as the health of aquatic and land animals, thus posing a significant risk to ecosystems and biodiversity.