Abstract: A cast net support apparatus including a mouthguard assembly and a cast net assembly is disclosed. These assemblies in conjunction with one another provide an easy-to-use casting net solution. The mouthguard assembly includes a mouthguard that is detachably tethered to the cast net assembly. The mouthguard includes a tether that is fastened to a rod. The rod is then inserted into a buoyant cast net support attachment that is in turn fastened to a net. When the user prepares the net for casting, they will grip the mouthguard that is tethered to the net edge in their mouth. Thereby affording them better support of the net before casting. The better support allows for a further and more accurate cast of the net. As the user casts the net the mouthguard tether detaches from the net leaving the user with the mouthguard in the user's mouth.