Under what condition can a vessel be classified as engaged in fishing?

A vessel can be classified as engaged in fishing primarily when it uses nets or lines to catch fish. This classification is based on the activities that distinguish fishing vessels from other types of vessels, such as those primarily for transport or recreation. The use of nets or lines indicates that the vessel is actively participating in the act of extracting fish from the water, which is the defining characteristic of fishing.

While displaying fishing lights can indicate that a vessel is fishing, it does not necessarily classify the vessel as engaged in fishing. A vessel could display lights for reasons unrelated to fishing activities. Being anchored does not inherently classify a vessel as engaged in fishing either, as vessels may anchor for a number of reasons unrelated to fishing. Lastly, taking on passengers relates to the transport or charter of individuals rather than any fishing activities, thus not fulfilling the criteria for being classified as a fishing vessel.