Dateline Pacific evening edition for 27 April 2017

People in the Pacific are being advised to avoid certain fish after a study revealed high levels of mercury in hair samples from the region; Papua New Guinea's Manus MP Ronny Knight says Australia's Immigration Minister Peter Dutton has tried to discredit him in the eyes of the public; Samoa Observer newspaper concerned about media freedom after police conduct search warrant; Few gains for Pacific in PACER deal - New Zealand MP; And Guam protests Trump's stance on climate change.