Chinese softshell turtle seen at 34th Ave

October 5, 2026

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A , a threatened introduced species from Asia, was recorded October 1 at 34th Ave.¹ This escapee-derived population persists in local waters where it competes with native turtles for habitat and resources.¹

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More about Chinese Softshell Turtle

Softshell turtles hunting in summer shallows

June 13, 2026

The pond edges in Shinjuku's urban waterways catch the long light of summer afternoons. Water temperatures have climbed into the high twenties, and the shallows hold warmth well into evening. If you're walking near one of these quiet channels, step closer to the water's edge. The surface may look still, but summer brings its own kind of activity to these urban refuges. Just beneath that placid surface, Chinese softshell turtles are hunting. These invasive predators have made themselves at home in Tokyo's freshwater systems, and summer's warmth brings out their most active feeding behavior. Unlike the hard-shelled turtles you might expect, softshells move through water with surprising speed. Their flattened, leather-like shells and powerful limbs make them efficient underwater hunters. A softshell can remain motionless on the bottom for long stretches, then explode upward to snatch prey in a movement almost too quick to follow. They hunt by ambush, settling into the mud and debris of the pond bottom where their mottled shells disappear completely. Their primary targets are the small Japanese ricefish that school in these same warm shallows. These native fish, no longer than your thumb, gather near the surface during the heat of the day. The ricefish feed on mosquito larvae and other surface insects, making them vulnerable to attack from below. A hunting softshell positions itself beneath a school and waits. When a ricefish ventures close enough, the turtle's long neck shoots forward with remarkable speed. The kill is quick and efficient. The turtle's soft lips and powerful jaws can handle prey much larger than the delicate ricefish, but these small fish provide steady, abundant nutrition during the breeding season when energy demands are highest. The relationship is entirely one-sided. The ricefish, already under pressure from habitat loss and water quality changes, face additional predation from these introduced hunters. European carp, also present in these waters, are too large for most softshells to handle, but their young fry become prey when they venture into the shallows. Summer's long days extend hunting opportunities well into evening. As the air temperature drops and insects become more active near the water surface, both predator and prey adjust their behavior. The ricefish rise higher in the water column to feed on emerging midges and mosquitoes. The softshells follow, moving into even shallower water where their attacks create brief disturbances at the surface. These moments of predation happen quickly, but they leave expanding rings on the water that catch the late light. Watch for these sudden circles spreading outward from what seemed like empty water. They mark the spots where this ancient hunting strategy plays out in a thoroughly modern landscape, where native prey meets introduced predator in the warming shallows of an urban summer.