"The time for setting aside tiny areas of sea that only protect a few sedentary species is over, and it [the sanctuary] is important because it shows the way in terms of putting large areas aside," said Carl-Gustaf Lundin, head of the IUCN's Marine Programme.
Doubts have been expressed about Palau's ability to police its Economic Exclusion Zone, with just one fast offshore patrol boat.
According to the BBC
, a recent aerial survey logged some 70, mostly illegal, fishing-boats in the area.
Other methods can be deployed, however.
The IUCN was "exploring what options there are for monitoring remotely at low cost", said Lundin
The US Government, he
added, had been "sharing lists of illegal vessels with established fishing companies, so that they can report on their dishonest or non-decent peers".