Which herbicide acts as a contact herbicide and shows very low toxicity to fish?

The herbicide Endothall is known for its effectiveness as a contact herbicide, meaning it works by directly harming the vegetation with which it comes into contact. One of the key features of Endothall is its relatively low toxicity to fish, making it a more environmentally friendly choice for aquatic applications compared to other herbicides. This characteristic is significant for those managing aquatic ecosystems, as maintaining fish populations is crucial for ecological balance.

In contrast, the other herbicides in the list have varying levels of toxicity towards aquatic life. Flumioxazin, although effective as a herbicide, does exhibit greater toxicity risks to certain non-target organisms, including fish. Diquat, while also a contact herbicide, is known for its higher toxicity to fish species and aquatic invertebrates, necessitating careful consideration when using it in water bodies. Diuron, on the other hand, is persistent in the environment and poses significant toxicity risks to aquatic organisms.

In summary, Endothall stands out as a suitable choice as it effectively targets troublesome aquatic weeds while minimizing harmful effects on fish populations, making it a preferred option in the context of aquatic weed management.