In the electric eel, some 5,000 to 6,000 stacked electroplaques are capable of producing a shock at up to 500 volts and 1 ampere of current (500 watts).
here is a single Electric eel lighting up a christmas tree
http://www.youtube.com/watch?v=y9wktSQdyaE
Will the electric eel provide more energy out than what it takes to feed it and keep the aquarium going? The food for the eel has to be manufactured or caught, then kept alive and transported to the aquarium and this takes energy to do this. You have the water and air pump that needs energy to run, water will evaporate from the tank and will need to be added to keep the water level at the desired level, the filtration system needs to be maintained, lights for the tank, a heater or cooler to keep the tank at the desired temperature for the eel, etc.
It looks good on the surface, but it's not lighting the Christmas tree for free. This really shows the ignorance of mankind. LOL
If the electroplaques can be grown in tanks like they do any other cell which they can already do, But what you do is make the electroplaques malignate so they never die and never have to be replaced, they live on Sodium and Potassium salts which happen to also charge the electroplaques, as the sodium and potassium leave the cells they discharge all at once.
imagine a 1000 gallon tank filled with nothing but electroplaques, some saline sodium potassium water as a medium for keeping the cells alive.
Each individual cell can only produce 0.15V
Jerry