Rattail

In the North Atlantic, Russians pioneered the harvesting of rattails, a ubiquitous deep fish with big eyes and a long tail that swishes back and forth in a sinuous motion.

All of which could explain why, when I had my hair styled in a tight ponytail for the shoot accompanying this feature, most people who saw me thought I looked "unapproachable" (which might simply be a polite way of saying: "You looked like you had a rattail and a Croydon facelift").