Wide, slow‑moving channels of the lower Mekong near Cần Thơ provide ideal deep‑pocket habitats for Pangasius humeralis, with abundant prey and easy riverbank access.

Mountain tributaries of the Red River provide clear, oxygen‑rich water where Schistura rupecula thrive; locals often guide anglers to the best pools.

In the Mekong Delta’s tributaries, loach are less abundant but can be found in the slow‑moving, muddy channels near the river mouth.