Are several species of water snakes harmful to humans and fish?

Several species of water snakes are generally harmless to both humans and fish, which supports the answer that they do not pose a significant threat. Water snakes are typically non-venomous and tend to avoid human contact. Their diet often consists of fish and amphibians, which they catch and consume, but this behavior is a natural part of their ecosystem role rather than a harmful interaction with humans or other aquatic animals.

While it's true that certain species may exhibit defensive behavior if threatened, such actions do not translate into a harmful status; they are simply reacting to perceived danger. This sets them apart from numerous other aquatic species that might be venomous or aggressive. Thus, the understanding of water snakes as generally harmless is well-supported in ecological studies and the biological behaviors observed in these species.