

it's weird because he never bothered any of the fish, ever. but since i started giving him chop meat once a week, now he's eating them. i think i turned him into a blood thirsty demon-fish.

yesterday:::


today::: bob in his stomach.

The problem is this fish could possibly very well survive in a pond somewhere....google invasive fishi was actually wondering if any of you would know, if a "domesticated" catfish like lee would survive in a pond. a natural pond not a manmade one. just wondering because i was checking out on google all these red tail hybrids and they actually are found out in these giant lakes and ponds in the wild. and a lot of the ones that are domesticated are taken from the wild.
Yes, of course it can be done, but if the ambient temperature of a 4000 gal pond is 50'F below the target temperature (e.g. 25'F and target temp 75'F - this difference is claled delta), you need some SERIOUS amount of heating. If you can keep the temperature above, say, 72'F, you'd be fine. But as you probably know [or can imagine] an outdoor pond will transfer heat to the ambient air and the surrounding ground. I doubt the ambient ground temperature outside in New Jersey is above 60'F, on average. A 15'C delta (about 27'F) on a 300 liter (75 g) aquarium recommends 2 x 300W heater. It is not entirely linear, as the surface area to volume doesn't grow linearly - double all sides of the tank, and it's grown the volume by 2^3 = 8 times, whereas the surface of the sides have only grown 2^2 = 4 times. So if we scael 75 gal -> 4000 gal, we find that we need about 4x the length, height and width. That means that we have about 16x the surface area. And once the heat is IN the tank/pond, the surface area is what "leaks" heat out of the water. So if the temperature difference is 27'F, we need something like 600 * 16 = 9600 W worth of heating in the pond. Now, of course, you need to cope with winter conditions, so double that 27'F to 54'F to cope with that. The general physics laws for temperature transfer is directly proportional to the delta-temperature, so twice as large temperature delta -> twice as much heating needed to keep constant temperature -> about 20kW heating capacity. That is a mid-size boiler (one that you'd fit in a two-three bedroom house here in England). Of course, when it's warm, it won't have to run much. Oh, and this doesn't take into effect any windchill factor due to windy weather etc.Mysticalxwhisper wrote:really? i was told that as long as it had a heater it would be okay?
we don't have room for a pond anyway, but thats at least what i thought.
MatsP wrote: Yes, of course it can be done, but if the ambient temperature of a 4000 gal pond is 50'F below the target temperature (e.g. 25'F and target temp 75'F - this difference is claled delta), you need some SERIOUS amount of heating. If you can keep the temperature above, say, 72'F, you'd be fine. But as you probably know [or can imagine] an outdoor pond will transfer heat to the ambient air and the surrounding ground. I doubt the ambient ground temperature outside in New Jersey is above 60'F, on average. A 15'C delta (about 27'F) on a 300 liter (75 g) aquarium recommends 2 x 300W heater. It is not entirely linear, as the surface area to volume doesn't grow linearly - double all sides of the tank, and it's grown the volume by 2^3 = 8 times, whereas the surface of the sides have only grown 2^2 = 4 times. So if we scael 75 gal -> 4000 gal, we find that we need about 4x the length, height and width. That means that we have about 16x the surface area. And once the heat is IN the tank/pond, the surface area is what "leaks" heat out of the water. So if the temperature difference is 27'F, we need something like 600 * 16 = 9600 W worth of heating in the pond. Now, of course, you need to cope with winter conditions, so double that 27'F to 54'F to cope with that. The general physics laws for temperature transfer is directly proportional to the delta-temperature, so twice as large temperature delta -> twice as much heating needed to keep constant temperature -> about 20kW heating capacity. That is a mid-size boiler (one that you'd fit in a two-three bedroom house here in England). Of course, when it's warm, it won't have to run much. Oh, and this doesn't take into effect any windchill factor due to windy weather etc.
I would guess that putting an enclosure over the pond would keep off the worst of the cool would be a good idea financially. You will of course still have to heat it, but the bill for keeping the water warm will be somewhat smaller.
--
Mats
Mike C wrote:You may try this store in Maryland... I have only been there a couple of times but it is nice and it says they rescue large fish. I am not sure how far away it is from you, but I can't imagine it is more than an hour or so.
http://www.houseoftropicals.net/map-directions.html
Mike
Considering that Mr Lee is now at the stage where he takes large prey, I'd say the Endlers will not be considered food at all.AlaskanCorydoras wrote:Hrrm. I vote you put a serious number of Endlers in there and see who wins. . . I bet the endlers would reproduce so fast Mr. Lee wouldn't be able to eat them all.
I can donate 50 to the cause. . . Oh wait it is up to 65 now.
Err. . .make that 75.
Umm. . . 80?
Except that's not quite how it works. Whilst I'm sure you said it in jest, I'd like to explain how it works...Lloydy wrote:Maybe so, but if he just swims around with his mouth open he will act like a whale hoovering up krill
i found a couple places. i just have to call them today. one place is called shark aquarium. it's in jersey.Mike C wrote:Mystical,
It is to the south and west of Baltimore... I am not real familiar with New Jersey, but I had hoped you lived in the south. Still, if you can't find anything closer to you I am sure they would take him. I recall they already had several large red tails.
Mike C.
Yos wrote:I guess you'll just have to eat him back to pay for what he did to his friends.... eye for an eye... nom for a nom?