Final answer:
A fishing vessel that is making way through water and fishing displays navigation lights and day shapes to signal its activities to other vessels.
At night, it would typically show a green light over a white light if trawling, or red over white for other fishing methods. During the day, it shows two cones with apexes together.
Step-by-step explanation:
The question pertains to the navigation lights and day shapes required by the International Regulations for Preventing Collisions at Sea (COLREGs) for a fishing vessel that is fishing and making way through water.
When a fishing vessel is under way and fishing, it would typically display two lights vertically: a green light over a white light. The green light indicates that the vessel is trawling.
If the vessel is not trawling but engaged in other fishing activities, it should display two lights but instead of green over white, it will be red over white. These lights help other vessels to identify the fishing vessel and take appropriate action to avoid collision.
In addition to these lights, during the day, a fishing vessel would display two cones with their apexes together (like an hourglass) in a vertical line where they can best be seen.