Skipjack tuna commercial tunas, and its population is considered sustainable against its current consumption. Its fishing is still controversial due to the methodology, with rod and reel or fishery options being promoted as ecologically preferable. Purse seine methods are considered unsustainable by some authorities due to excess bycatch, although bycatch is said to be much reduced if fish aggregation devices are not used. These considerations have led to the availability of canned skipjack marked with the fishing method used to catch it. Skipjack is considered to have "moderate" mercury contamination. As a result, pregnant women are advised against eating large quantities. In
HMS Skipjack (1889) and in clearing this minefield. On 18 November 1914 "Skipjack" and the gunboat were about to start a minesweeping run in the channel between Fair Island and North Ronaldsay when "Skipjack" commanding officer sighted the conning tower of the German submarine "U-22". The two gunboats set off at full speed in pursuit, but the submarine outpaced them and dived to safety after a chase of 45 minutes. On the evening of 24 November 1914, the German submarine "U-16" was off the east coast of the Orkneys when she was spotted by a group of trawlers that were minesweeping. The trawlers