A fish can see everything above it in clear water irrespective of its position in different depth. The critical angle for water is 48.5°. The angle of the cone of vision for the fish is twice of this angle.
Hence it is 97°. All the objects outside water but in this cone of vision Will be seen by the fish. Outside this range the fish will see all the objects in the surrounding area (see figure). Those objects which are at the bottom will be seen by the fish due to total internal reflection taking place at the water-air interface.
