Why do otters in S’pore prey on koi fish but not eat them?

Why do otters in S’pore prey on koi fish but not eat them?

Source: mothership

12/20/2022

Of late, the otters' cutesy image has been tainted by their notoriety for entering homes, killing fishes in ponds and leaving carcasses for owners to discover.

This happened again on Dec. 6 in a home along Surin Avenue near Kovan.

20 koi fish dead

Residents of the Surin Avenue home woke up to the sight of death on Dec. 6 when they discovered that as many as 20 of the koi fish they reared had been dismembered.