CGS Petrel[a] was a Canadian patrol vessel used primarily for fisheries protection on the upper Great Lakes from 1892 to 1904.

The vessel was powered by a compound steam engine driving one screw creating 50 horsepower (37 kW) (nominal).

Prime Minister Sir Charles Tupper then sought British Royal Navy aid in patrolling Canadian fisheries, but his request was rejected.

Silver Spray returned to Erie, Pennsylvania having been hit twenty times, but had escaped from the Canadian vessel.

[4][5] Petrel remained on the Great Lakes until 1904, when the ship proved to be too slow to catch up with American fishing vessels.