Hygrotus chinensis

Adult hygrotus chinensis are carnivorous, so bait traps with meat or insects may be effective. Meanwhile, larvae also eat live prey, but they can be less picky, so meaty baits could also work for them.

The eggs of hygrotus chinensis are typically laid on submerged vegetation in freshwater bodies, such as ponds or the quiet edges of streams, where they're somewhat protected from predators and have access to the algae or microbes they might feed on. The larvae, being aquatic, can be found near the bottom of these water bodies, actively preying on smaller aquatic organisms. As they progress through their development, the larvae may inhabit different microhabitats within the same water body, adapting to their increasing size and predatory nature. Pupation generally occurs in a secure and hidden location, often within the water's vegetation or just below the surface on the shore. Adult hygrotus chinensis, while still aquatic, are more mobile and can be found at various depths as they hunt or search for mates, but they also have the ability to disperse to new habitats by flying.

The best time to find adult hygrotus chinensis is usually at night when they come to the surface to breathe and mate, while larvae are active during the day and can be found within their aquatic habitats.

Calm, warm weather is most suitable for finding hygrotus chinensis, as they are more active when the water temperatures are higher and there is less disturbance in their aquatic environment.