noun
freshwater goby; Rhinogobius
Refers to any fish of the genus Rhinogobius, small freshwater gobies found in streams and rivers across East Asia. Often encountered in the context of fishing, aquariums, or local ecology.
この川ではヨシノボリがよく釣れる。
You can often catch freshwater gobies in this river.
水槽にヨシノボリを飼っている。
I keep a freshwater goby in my aquarium.
The name likely derives from the fish's habit of climbing reeds (葦, yoshi) in shallow water, though the exact origin is uncertain.