Not Much Life Left on the Beach

I go to Punggol beach regularly at low tide to collect pistol shrimps and any other sea creatures I could find.  Now it is very hard to find anything other than ragworms and pistol shrimps.  The sea anemones are dying (all turned white).  No goby fish and no baby shrimps.  The beach is black in colour signifying death of many sea creatures and all rotting and turning black.  Yesterday, I saw a fairly large mudskipper.  It is very shy and hard to get near.