The speargun for underwater fishing comprises a spear, a hollow hand grip having therewithin a retaining mechanism for retaining the spear, a snap trigger of the retaining mechanism for the release of the spear, a hollow barrel fixed to the hand grip, a terminal head fixed to the barrel and supporting at least one lateral pulley on which a rubber band for the propulsive thrust of the spear is wound, and a housing for engaging one end of the rubber band, formed in a single piece with a wall of the hand grip and located in a transversal geometric plane of the speargun which includes the axis of the barrel and cuts the speargun into an upper half-part and a lower half-part.

A speargun having a stock, a muzzle at a distal end thereof; and a pair of matching elastic tackles assemblies either side of the stock for tensioning a wishbone from the muzzle to a spear. Optionally, the speargun may have a second elastic tackle assembly disposed on the bottom of the stock. According to another approach, a speargun component kit may be provided to a user to attach to their own stock having a muzzle; a pair of tensionable pulley tackles having a line to attach a spear, to attach to the muzzle, and to attach to at least one pair of elastic bands at a second end; an adjustable anchor mount of the elastic bands to the stock, and a spear release mechanism.

A speargun having a stock, a muzzle at a distal end thereof; and a pair of matching elastic tackles assemblies either side of the stock for tensioning a wishbone from the muzzle to a spear. Optionally, the speargun may have a second elastic tackle assembly disposed on the bottom of the stock. According to another approach, a speargun component kit may be provided to a user to attach to their own stock having a muzzle; a pair of tensionable pulley tackles having a line to attach a spear, to attach to the muzzle, and to attach to at least one pair of elastic bands at a second end; an adjustable anchor mount of the elastic bands to the stock, and a spear release mechanism.

A reduced length crossbow with a trigger located near a midpoint of the crossbow and a small included angle of the draw string when in the drawing configuration that creates a space between the draw string and the user's face. The included angle of the draw string when in the drawing configuration may be less than about 25 degrees. The trigger is typically located proximate the midpoint within about 10% of the overall length of the crossbow.

A speargun having a stock, a muzzle at a distal end thereof; and a pair of matching elastic tackles assemblies either side of the stock for tensioning a wishbone from the muzzle to a spear. Optionally, the speargun may have a second elastic tackle assembly disposed on the bottom of the stock. According to another approach, a speargun component kit may be provided to a user to attach to their own stock having a muzzle; a pair of tensionable pulley tackles having a line to attach a spear, to attach to the muzzle, and to attach to at least one pair of elastic bands at a second end; an adjustable anchor mount of the elastic bands to the stock, and a spear release mechanism.

A speargun having a stock, a muzzle at a distal end thereof; and a pair of matching elastic tackles assemblies either side of the stock for tensioning a wishbone from the muzzle to a spear. Optionally, the speargun may have a second elastic tackle assembly disposed on the bottom of the stock. According to another approach, a speargun component kit may be provided to a user to attach to their own stock having a muzzle; a pair of tensionable pulley tackles having a line to attach a spear, to attach to the muzzle, and to attach to at least one pair of elastic bands at a second end; an adjustable anchor mount of the elastic bands to the stock, and a spear release mechanism.

Some embodiments may be of spearfishing apparatus fitted with at least one magnet configured to repel sharks away from the spearfishing apparatus. The spearfishing apparatus may be one or more of: a spearfishing shaft, a spearfishing tip, and/or a spearfishing gun. Such magnets may be electromagnets powered by batteries in some embodiments.

The invention refers to a new ejection order of spears or arrows which functions with compressed air and can be applied to spearguns and crossbows as well.

Two piston ejection device which consists of two air chambers (A) and (B). These air chambers are connected so that they can exchange gases. Air chamber's (B) external hole is open. The characteristic is that pistons (1) and (2) move in air chambers (A) and (B). Pistons (1) and (2) are also connected with the rope (3).

The invention refers to a new ejection order of spears or arrows which functions with compressed air and can be applied to spearguns and crossbows as well.

Two piston ejection device which consists of two air chambers (A) and (B). These air chambers are connected so that they can exchange gases. Air chamber's (B) external hole is open. The characteristic is that pistons (1) and (2) move in air chambers (A) and (B). Pistons (1) and (2) are also connected with the rope (3).

Some embodiments may be of spearfishing apparatus fitted with at least one magnet configured to repel sharks away from the spearfishing apparatus. The spearfishing apparatus may be one or more of: a spearfishing shaft, a spearfishing tip, and/or a spearfishing gun. Some embodiments may be of personal floatation devices (PFDs) fitted with at least one magnet configured to repel sharks away from the PFDs. Some PFDs may be fitted with a tethered drop-down magnetic apparatus to protect lower extremities of a wearer of such PFDs. Such magnets may be electromagnets powered by batteries in some embodiments.