The fish is a sphere which i vertex edited to get the fins and the mouth with a sphere for each of the eyes
the weeds are capped hole splines and thickened, renderable lines
the rocks are twisted, bent spheres
theres a layered volume fog and a standard volume fog
the sand is a plane with noise
the lights are 3 omnis - 1 with a shadow map, and a spot light with volume fog - projecting a noise map