Abstract: A hydrodynamic fishing sinker attached to a fishing line and leader to which a lure is connected. The sinker comprises a plate member having upper and lower surfaces, a fin attached to the upper surface at one end thereof, and weights attached to the lower surface at the opposite end thereof. An arm is pivotally connected at one end to the plate member, the opposite end thereof being connected to a fishing line. The arm is movable towards the plate member when the latter assumes a diving attitude. A clip assembly is fixed to one of the plate member surfaces and lockingly engages a latch assembly carried by the arm, to hold the sinker in set position. The clip assembly is disengaged from the latch assembly under force exerted on the arm by a fish striking the lure or by a fisherman pulling on the fishing line.

Abstract: A down rigger weight includes a body having oppositely disposed first and second surfaces. First and second weights are provided and each of the weights substantially overlies one of the surfaces and the weights are of substantially equal dimension and weight. A nut and bolt secures the weights to the body. At least a first eyelet is secured to and extends from the first weight. A locking system is operably associated with the first weight for preventing rotation thereof about the nut and bolt.