Fish Laboratory: MS of fish laboratory, technician taking water sample from machine. MCU of trout in tank. MCUs of trout in tank (ph 4.0) having difficulty to swim. Similar shot with trout moving from bottom to top of tank. Shot of trout on its back in bottom of tank struggling. MCU of head of trout to TILT UP on another one. MCU of trout on its back dying. TILT DOWN to dead one on bottom of tank. CU of fish mouth and eye, of fish gasping and swimming away, of fish swimming towards camera. CU of trout's face. MS of trout in tank (ph 5.6) with several PANs to other tanks (ph 4.5) (ph 4.0) (ph 3.5).