It's estimated there are currently only 54 Māui dolphins over one year of age.
The Supreme Court has ruled against a bid to mine the South Taranaki seabed.
DoC estimates up to $696 million a year is required to look after around 4000 vulnerable species.
The Department of Conservation has attempted to shepherd the pod from the inlet to help prevent a stranding.
A pod of seven orca have been in the Pauatahnui Inlet this weekend, chasing stingray.
The cost of keeping Toa alive ran over $10,000 - but in the end, the orca's condition deteriorated and he died last Friday.
Environmentalists say allowing access is potentially endangering the ecosystem.
"We have a duty of care towards our protected species and this is a callous attack on our native taonga."
"Allowing some Māori to customary take in a fishing reserve makes the policy more about race than fishing."