Abstract: An anchor has a fluke with a longitudinal axis that extends from the rear end of the fluke to its front end. A connection member couples the fluke with the lower end of an anchor line. The connection member comprises an anchor shank and at least one coupling with two cooperating coupling members. The first coupling member is situated on the fluke side of the coupling and is directly or indirectly connected to the fluke in order to follow its movement. The second coupling member is situated on the anchor line side of the coupling and is directly or indirectly connected to the anchor line. An operation member is activated by swinging the anchor line held taut in order to change its angle with respect to the longitudinal axis of the fluke and then to mutually displace the first and second coupling member from a coupling position to a position in which the second coupling member is released or emerges from coupling engagement with the first coupling member.