"Really, the thing hunters have got to get into their head is to identify their target and follow firearms rules."
Mr McIvor, of Rotorua, said hunters could make themselves more visible by wearing orange glaze, or bright colours.
He said mistakes had been made by even the most experienced hunters.
"Incidents happen regardless of experience. It's across the board and the concerning part - it's usually experienced hunters and middle-aged men. It's just identifying their target, as soon as it hops into the open they should take a second to make sure it is a deer.
"Sometimes it's hard because animals are roaring and there's a lot of adrenaline flowing, you get so hyped up."
He said hunting was a valuable sport. "We see them [deer] as a value game animal. Ninety per cent of hunters in New Zealand hunt for food, particularly in the Rotorua district."
Information about the firearms safety code can be found at www.police.govt.nz. Safety information is at www.mountainsafety.org.nz or www.deerstalkers.org.nz. For DOC permits, go to www.doc.-govt.nz/hunting-permit.