In this breeding season, at least 3-4 egret colonies also faced the same problem. Govt/public utilities commenced their maintenance works (road digging in order to change waterpipes and cable etc) during the breeding time of egrets.
What to do? We sent letters to Govt/public utilities and asked them to stop or reschedule the work. Replies were positive.
So, suggest HKBWS send a smilar letter to Marine Dept.
Captain