There were land-based solutions available, such as large tanks using fresh water from the mountains as opposed to clogging up open waters with acres of fish cages, McGuinness said.
More research needed to be done to clarify whether endangered species such as the Māui dolphin had been seen in the ocean where the proposed farm was located, she said.
The Cook Strait was home to multiple species of fish and birds - and they all needed to have their habitats respected and protected, she said.
The Department of Conservation has also appealed against the fish farm proposal and NZ King Salmon said it will start negotiating with them in the new year.
- RNZ