The Oxygenator by Aqua Innovations is definately not a gimmick. It does create pure 100% oxygen in bubbles so small they cannot break the water’s surface. Aerators or bubblers use ambient air (20.9% oxygen) and tries to force it into the water in bubbles so big they are not in the water long enough for the oxygen to dissolve into the water.
In an earlier post, it was mentioned that products like this don’t compensate for overcrowding or water temp. The fact is that the Oxygenator maintains your livewell or bait bucket’s dissolved oxygen content between 80% – 98% dissolved oxygen… even under a load of fish. Bubblers just can’t keep up. When was the last time you kept 20 lbs of fish alive in a 20 gal aquarium with just a bubbler?
As for water temp, the Oxygenator actually has an temp sensor built into the unit so it actually creates more oxygen as the water warms. It always keeps that dissolved oxygen content right where it needs to be to keep your fish alive.
JoshBjork was correct, however, about the waste build up. CO2 and ammonia build up will kill your fish/bait. To get rid of this you must either filter the water, aggitate the water (bubblers do a good job of this), or add fresh water from time to time. All the Oxygenator does is takes care of the oxygen.
One other problem I noticed. Many, many baitshops add salt to their tanks to protect the slime coat of the bait and to kill bacteria that would otherwise build up in their bait tanks. This salt water solution from the bait shop water should NOT be used with the Oxygenator. Through the electrolitic process the Oxygenator uses to create the oxygen, in the salt water solution it also creates chlorine. I am 99.99% certain that is what was killing your suckers and shiners. It may be too late, I noticed you said you were going to return the unit yesterday, but hopefully you still have it. Give it another try, they really do work better than anything I have ever seen.
By the way, the Oxygenators can already be found in Skeeter boats (Oxymax option), Crestliners Tournament series boats, and Tracker Team Tundra boats. In 2005 they will be standard in all of these boats along with more models as well in Ranger, Champion, Stratos, and possibly Triton. The product has definately proven itself to the boat manufacturers.
Sorry for the long post, let me know if you have any additional questions.
Tight lines!