"In the process all the jack mackerel accidentally escaped too," she said.
No fish were caught or harmed, but legally Sanford was now required to report the jack mackerel as catch and it counted against the company's annual catch entitlement for this species.
"Costs comes second in a situation like this with Sanford's focus on sustainability."
Sanford supported what the skipper of the San Columbia and his crew did in this situation, Ms MacMillan said.
"The skipper felt that he simply had no viable choice. He believes that any New Zealander in his position would have done the same and Sanford agrees with him."
The skipper was an experienced fisherman who had been fishing for 40 years and he went to a lot of trouble to avoid fishing when dolphins were present, as he had done several times earlier on that day, she said.