"Making broad-brush statements about the primary sector is not appropriate given the work that many farmers are doing to reduce the impact of their activity on waterways."
Grubb said the starting point for the meeting was to find areas of common interest.
He admitted there may still be some difficulties around topics of national policy, but there was goodwill on both sides.
"It's better to consult than to confront," he said.
Federated Farmers acknowledged the tense relationship the organisations have had in the past and that some farmers and growers would have to put aside their "dislike and distrust" towards Fish and Game.
"We are not breaking out the marshmallows, lighting the camp fire, and singing Kumbaya together, but we both recognise that an adversarial approach really only benefits lawyers," Federated Farmers president Andrew Hoggard said.
"High-level board discussions are now underway and are leading the way forward to a more productive relationship," he said.
"We both love the outdoors and likely have more in common than we do in difference.
"We are not going to agree on everything, but we can at least disagree in a respectful manner that doesn't vilify either farmers or fishers in the eyes of one another."
But advocacy group Choose Clean Water NZ is worried the encounter could dilute Fish and Game's freshwater commitments.
"We believe the reason Federated Farmers is taking an interest in Fish and Game now is to weaken Fish and Game's work to protect freshwater," its spokesperson, Marnie Prickett, said.
Prickett said legal fights have more often been against agricultural industry bodies, like Federated Farmers, who she believed sought to weaken protection for rivers and lakes.
"If Fish and Game moves closer to Federated Farmers, it will undermine its mandate to protect freshwater habitat.
"Federated Farmers really needs to acknowledge the science that already exists out there on the impacts and drivers on the degradation of waterways. One of the big impacts is the intensification of agriculture."
If this is going to be a change of heart for Federated Farmers, she said, then they need to acknowledge the role of intensification.