While they may sometimes congregate in groups for other reasons, such as spawning or migrating, they do not typically hunt in packs.
However, there are some exceptions:
* Juvenile salmon may sometimes school together for protection from predators, and they may also forage together in groups.
* Adult salmon can sometimes be observed feeding in aggregations, particularly in areas with abundant prey. But this is not necessarily coordinated hunting behavior; it is more likely that they are simply attracted to the same food source.
Overall, the most accurate answer is that salmon are primarily solitary hunters, but there are some instances where they may exhibit group foraging behavior.