A watercraft has a hull which, in the area of the deck has a support on which parts of the upper body of a user can rest and where the user can hold on to handles. A flow channel is defined on the hull and a propelling screw is disposed in the flow channel. The flow channel has an intake port and downstream of the propelling screw a jet outlet in the stern area. A support body is disposed on the stern area in such a way that the support body extends the support by means of its support surface. In such a watercraft, a considerable increase in traveling speed can be achieved if provision is made for at least one sliding surface to be provided on the underside of the support body and for the support body to be rigidly connected to the hull.

A jewelry display includes a ferromagnetic planar substrate and a bracket attached to a wall. The bracket has a wall engagement surface along an inner surface and a ferromagnetic planar substrate engagement surface along an outer surface. A non-slip covering attached to the ferromagnetic planar substrate engagement surface abuts the back surface of the ferromagnetic planar substrate. At least one bracket magnet is attached to the bracket. The back surface of the ferromagnetic planar substrate is configured to removably attach to the bracket due to the magnetic force of the at least one bracket magnet attracting the ferromagnetic planar substrate and a frictional force between the non-slip covering and the back surface of the ferromagnetic planar substrate. A plurality of jewelry fixtures are removably attached to the front surface of the ferromagnetic planar substrate, each jewelry fixture having at least one permanent fixture magnet and a jewelry holding structure.

Wakeboats that include an aquatic invasive species control apparatus are provided. These wakeboats can include: a wakeboat with a hull; at least one throughhull fitting in the hull of the wakeboat; an irradiation chamber in fluid communication with the at least one throughhull fitting, the irradiation chamber having a radiation source; and at least one water destination aboard the wakeboat. Methods for irradiating invasive aquatic species aboard a wakeboat are also provided. The methods can include: receiving water from outside the wakeboat hull; and irradiating water aboard the wakeboat prior to discharging the water.

Wakeboats that include an aquatic invasive species control apparatus are provided. These wakeboats can include: a wakeboat with a hull; at least one throughhull fitting in the hull of the wakeboat; an irradiation chamber in fluid communication with the at least one throughhull fitting, the irradiation chamber having a radiation source; and at least one water destination aboard the wakeboat. Methods for irradiating invasive aquatic species aboard a wakeboat are also provided. The methods can include: receiving water from outside the wakeboat hull; and irradiating water aboard the wakeboat prior to discharging the water.

A swim training apparatus in the form of a swimming kickboard with an adjustable flap. The base of the kickboard is constructed from a buoyant material, providing ample support to the user in water. The adjustable flap attached to the base is adjusted using a means that allows for the user to customize the flap's position between 0 and 90 degrees. This feature adds variation to workouts as it changes water resistance and buoyancy levels experienced by the user. A locking mechanism secures the adjustable flap at the chosen angle. Additional features may include an integrated handle in the buoyant base, a textured surface on the base for enhanced grip and the ability to detach the adjustable flap for easy maintenance or replacement. The method of use involves selecting the desired angle, properly securing it, and proceeding with the swimming or exercise session. It also provides the option of adjusting the angle during the swimming session and offering convenient storage with a flat or compact configuration.

A swim training apparatus in the form of a swimming kickboard with an adjustable flap. The base of the kickboard is constructed from a buoyant material, providing ample support to the user in water. The adjustable flap attached to the base is adjusted using a means that allows for the user to customize the flap's position between 0 and 90 degrees. This feature adds variation to workouts as it changes water resistance and buoyancy levels experienced by the user. A locking mechanism secures the adjustable flap at the chosen angle. Additional features may include an integrated handle in the buoyant base, a textured surface on the base for enhanced grip and the ability to detach the adjustable flap for easy maintenance or replacement. The method of use involves selecting the desired angle, properly securing it, and proceeding with the swimming or exercise session. It also provides the option of adjusting the angle during the swimming session and offering convenient storage with a flat or compact configuration.