Fully Automated Eel Management system - a few questions

[5/0]

Not quite sure what PLC Control is but interested,if you have a water feed at the location you could install a solenoid valve to deliver water once,twice or three times within a 24hr. Time table depending on the model you get.you could get one on line or Grainger's they will be pricey thou. As for water to get exchanged I would recommend a drain port with a screen on the inside (pervent escapes)several inches from the top of the tank.
As for temperature control you could get a use Poland springs cooler to keep the water chilled bit you will have to modify the evap coil to be able to chill the water and also have an adjustable thermostat.
One other important element is to keep the water clean from the ammonia build up,any and every pet store offer a product called Ammo chips pretty cheap and many different size containers to choose from.
I use a 55 gallon plastic drum that I burried in the ground next to my foundation and under my deck this will prevent sun and thermally protection from ambiant air. At a three day heat wave water temp will be nobgreater than 70° also for food I found they don't eat.
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[piemma]

I store about 2 dozen in about 25 to 30 gal of water. 4 aerators. I keep it in the back of my garage that's on the north side so no sun get in. If it's 80 to 90 degrees I change the water once a day.

As for food I buy the freeze dried Krill at the fish tank store . No sure if they eat it but I have keep eels up to a month with no ill effects. You will loose one every now and then.