Trinidad Nectomys lives near streams and other watersides. It forages both in water and on land at night, eating plants as well as small animals.
In the species photograph used in the university guide, the belly fur appears paler than the back.
It lives in waterside tropical forest and grassland and is active at night. Its reported foods include plants, fruits, fungi, crabs, insects, and small vertebrates; it forages in water and on land.
An extinction-risk assessment has not been added yet.