Is China Killing the Fish Around PAGASA ISLAND and also the Coral Reef?

Is China Killing the Fish Around PAGASA ISLAND and also the Coral Reef?

An article here indicates that China is killing off the fish and coral around Pagasa Island with chemicals.  This would reduce the livelihood of fishermen and locals to make a living which would make it easier for China to use the Island for military  purposes.

What do you think?  Do you think China is killing off the fish around Pagasa Island with chemicals or could there be some other factors contributing to the die off of these fish?    As this video shows there have been massive fish die offs lately around the world.  What do you think?