He said an aerial view inspection of Sandakan, Kinabatangan, Semporna, Mataking and hotspots in remote areas showed land clearings in river mouths and shallow areas.
Shahidan told the media during a visit here Monday that the District Office and Forestry Department should also investigate such land clearings.
He said inspection also showed several boat activities believed to be causing oil spillage in the area, adding that turtle egg smuggling activities also need to be monitored.
On another note, Shahidan said the barter trade system today is no longer like before and that transactions between one boat to another needs to be watched closely.
On another development, he said, the ongoing curfew in waters off six districts will be extended if necessary.
On the tourists' presence in the area, he said, their visit to district showed they are confident with the security team.