Final answer:
Canneries put pressure on traditional fishing territories by encouraging their expansion, leading to conflicts and competition over fishing rights to meet industry demands.
Step-by-step explanation:
The introduction of canneries significantly altered the customary system of fishing territories. With high demands for canned foods, the canneries required a constant and large supply of fish which pushed towards the expansion of fishing territories. This provoked conflicts and competition among individuals and communities over fishing rights and territories, as traditional fishing practices were challenged by the industrialized approach that prioritized mass production and efficiency.