A young humpback whale continues to be spotted by boaters in Boston Harbor, with videos showing the juvenile soaring into the air as it feeds on fish.New video from Wednesday showed the young humpback whale beaching very close to a boat fishing near Spectacle Island, about 1.5 miles from Castle Island in South Boston. The presence of the whale in a corridor busy with boat traffic prompted the MBTA to share a bulletin about its ferry service. "Ferry service may experience minor delays,” the MBTA warned on Wednesday, "due to the presence of a juvenile humpback whale in Boston Harbor."The young whale is believed to be the same one that has been hanging around since late July in the harbor, where they have been seen in the past, but typically depart after just a few days. According to NOAA, large whales can be a safety hazard for recreational boaters and fishermen because they can surface unexpectedly and are hard to detect. As whales feed at the surface and close to shore, the chances of encountering one increase.