"Although they are talking about wanting integrated marine protection, how do we achieve that when so many species are going between the two zones?" he asked.
The new law is an important one and Forest & Bird has been waiting for it for 15 years. Its new reserves and semi-protected areas were good, he said.
But what it also did was give certainty of access to fossil fuel and mining companies wanting to access the EEZ seabed.
"This is at the very time when the rest of the world is making commitments to get away from fossil fuels and leave some in the ground."
Trans-Tasman Resources' first application to mine ironsand off the South Taranaki coast was declined by the Environmental Protection Authority. But the company intends to apply again.
"They're coming back for another bite without a good ecological survey or any kind of understanding of releasing nutrients out of sediments and burying areas in residue. That would be an example of why going out 12 (nautical miles) isn't adequate," Mr Beautrais said.
He encouraged people to make submissions on the proposal before the March 11 deadline.
"This is New Sea Land - our name and our location. Most of what we control is under water. It's an incredible resource and the history on the land of extracting things and reducing the potential for sustainability isn't good. We've just got to avoid that in the ocean."