Our waterways are a vital part of our national defence.

It would be assumed that security and enforcement around them would be of high priority.

Hence, I am disturbed that there has been an increase in the incidence of illegal angling and the use of traps, in blatant disregard of regulations (Dead otter found in cage along Marina Promenade, man caught setting traps: PUB; ST Online, June 16).

This seeming lapse in enforcement could have more serious implications, should individuals harbour ill intent with our water supply.

It is clear that the warnings by national water agency PUB of penalties, and requests for members of the public to send in photos and videos of illegal activity are not working.

The authorities should seriously relook our waterway management plans before it is too late.

Lee Swee Mun