Abstract: An apparatus to be used in field studies of varying fish populations allowing visual display and photographing of live specimens without the excessive handling or undue stress normally accompanying such examination. The apparatus is made of a substantially rigid transparent material in the form of a V-shaped or W-shaped tank. This design allows a specimen to be wedged into position between converging viewing plates without exerting undue pressure to the specimen's body. The tank includes side plates which are fused with the viewing plates with a non-toxic adhesive material allowing the tank to be filled with water. A base plate is attached to the bottom of the V-shaped tank so that it may stand on its own. The W-shaped tank does not include a base plate so that all three troughs may be utilized.