Atlantic Sapphire's high mortalities reported last month were caused by "sub-optimal operational procedures" according to an update Tuesday from the land-based salmon producer.

The company reported Oct. 16, that "above normal and increasing mortality" in some of its salmon had spurred early harvests and a lower average weight than originally planned.

On Tuesday, it said that no disease or issue with any farmwide infrastructure or production inputs such as intake water or feed had been found, and that adjustments have now been made to automation and equipment and that farm operations and protocols "have been optimized."