
Source: Wikimedia Commons
Ranatra chinensis
A slender aquatic bug with raptorial front legs like a mantis and a breathing tube longer than its body. It flies better than any other Japanese water bug, moving to new waters often and even in daylight.
Ranatra chinensis is a water bug of 40-50 mm whose slender body and raptorial front legs recall a mantis, although the two are entirely unrelated. The breathing tube at the tip of the abdomen is longer than the body in males and about as long as the body in females. It lives in paddies and ponds and tends to prefer deeper water than the water scorpion that shares the same habitat, which is taken as niche partitioning. Perhaps because of its slender build it flies better than any other Japanese water bug, and it flies often even by day, so it readily colonises restored waters and artificial ponds. In the water it moves slowly, holding still among plants and dead stems in camouflage while it waits. Prey is pierced with the rostrum, injected with digestive fluid and sucked out, a process that can continue for more than fifteen hours with a large catch. It tolerates some pollution but not pesticides, and has declined across the country.
Source: Wikipedia (CC BY-SA 4.0)
The Water Stick Insect lives Adults 8 months to 1 year.
The Water Stick Insect grows to 40-50mm.
Origin
All of Japan, plus Taiwan, Korea, the Russian Far East and China
Lifespan
Adults 8 months to 1 year
Size
40-50mm
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Accepted name: Ranatra chinensis Mayr, 1865
Authority databases: GBIF
Nomenclature follows global taxonomic authority databases.
Sources: CITES Appendices (species not listed)
Regulations may change. Always verify the latest information with the relevant authorities.
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Temperature
20〜28℃
Humidity
60〜80%
Small fish, tadpoles, aquatic insects and other live prey
It breathes by raising the tip of its tube to the surface, so plants or dead twigs reaching the surface must always be provided. From about November it overwinters as an adult in cover on the bottom.
Adults become active around April, mate from May to July and the female lays alone. She chooses damp, soft places on land such as moss and pushes the tip of her abdomen in repeatedly. The slender white egg carries two filaments at its tip, thought to help it breathe. The larvae hatch in about ten days, moult roughly five times and reach adulthood in about forty days.
It is predatory and reacts to anything small that moves, so housed together they will eat one another. Larvae in particular are safer kept separately, and it should not be put with fish or shrimp, which it will treat as prey.
The larval period is short, about forty days, and because it overwinters as an adult it lives from one year into the next. Digestion is slow and a large prey item can occupy it for more than fifteen hours, so feedings need not be frequent.
It flies well and will escape from an uncovered container. It is sensitive to pesticides and is listed as critically endangered in Nagasaki Prefecture and near threatened in Fukuoka Prefecture. Keep collecting to a minimum and do not release captive stock into other waters.
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
The average lifespan of Water Stick Insect is Adults 8 months to 1 year. With proper care and nutrition, they can live a long and healthy life.
Water Stick Insect typically reaches 40-50mm as an adult. Size may vary depending on care conditions and individual genetics.
Water Stick Insect feeds on: Small fish, tadpoles, aquatic insects and other live prey. Aim for a balanced diet with appropriate feeding frequency.
The price of Water Stick Insect varies significantly depending on bloodline, size, captive-bred generation, and sex. Check our market price page for the latest pricing information.
Last updated: September 17, 2026