To stop the jumbo shrimp's shrinking ray you have to go to the far right side of the sea needle to gain your super strength. Once you have super strength go onto one of the platforms with the spinning targets and catch one of the boxes that the jumbo shrimp throws at you and throw it atone of the spinning targets do this to all of the spinning targets. Once none of the spinning targets are spinning go to the far left platform and become water ball throwing spongebob. Throw one water ball at each of the targets to stop his shrinking ray.