AS I UNDERSTAND IT LACK OF OXGEN IS BELOW THERMOCLINE,,WATER IN THAT AREA IS COOLER AND BELOW THAT IS WHERE FISH CAN NOT LIVE.IN OTHER PIC WHERE NO THERMOCLINE YOU SAID RAISEN WATER,WELL MOVING WATER WILL TAKE AWAY THERMOCLINE,RIVERS WITH MOVING WATER DO NOT SET UP A THERMOCLINE BECAUSE THE WATER MIXES,BTW GREAT SHOTS,LOOK LIKE A ONIX,BEST PIC TAKEN MACHINE OUT THERE IMO