Piranhas Feeding

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goosej13

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Right now I am feeding my piranhas feeder guppies... I want to start feeding them goldfish soon but Im curious on how big they have to be befor i can feed them feeder goldfish?
 
Read this, you shouldn't use goldfish as feeders. Piranha's do not need feeders, they do perfectly fine with frozen foods like prawn, they will even take prepared foods.
 
The goldfish just have to be small enough to fit in their mouths. I would not suggest feeding them though because

1. You risk killing all your piranhas because feeders are usually disease infested
2. They arent very nutritious, its mostly fatty stuff
3. Gets expensive
4. You will get bashed from the people on this forum because its unnecessary
 
I raise all the feeder fish myself so i know they are disease free. and I am also feeding them roast beef :D chicken and trout eggs.. They are getting a variety forsure. I don't beleive it is unnecessary. Its natural for them to hunt and kill their own food... I know they prefer the live food over the flake and meat simply because when i put both in there they go for the live food first... I have been feeding them trout fry (also raised my me) and they love it... I setup 2 tanks of pirhanas 5 in each both 40 gals and iv been feeding the ones a variety with the live feeders... And the others fake flake food and the ones eating the high protein meat and feeder fish have basically tripled in size in over a month and the ones on flake food really haven't grown at all and 2 have died... I am doing this as a study for my school (im taking aqua culture) and discovering if RBP's do better or not. Its a myth our teacher proposed to us students and said he would give us bonus if we conducted an experiment. I realize that it may seem unethical to feed them live food but its natural for them. Its like a human eating fake canned food every day all day or even mcdonalds. It is all fake (to a point) and natural foods and organic foods are SOOO much better for us... So my theroy is that piranhas are the same and with my study it has proved that. I don't mean to harp on you guys or come off the wrong way... Its just im working wiht facts
 
Your hasn't "proved" anything fully from the details you've given. For example, you may well be doing this but I have to ask, are you doing the same water change schedule on each tank? Using the same filter? The exact same tank, decor, dimensions etc.? Are the tanks the same temperature? Do they have the same amount of light?Also you'd have to know the genetics of the fish unless both groups are from the same parents? Also to prove that the live food is better for them, they'd have to live there whole life and have an autopsy of sorts to discover if anything was wrong with them internally, I'd of thought at least. Also you'd have to repeat the test of course.
 
20% water change on both tanks weekly I have a magic marker mark on the outside of the tank that I use and its the same on both tanks
both with same filter and tank
both dark gravel bottom and same back drop on both (cut it off the same roll in the store)
a friend of mine had 20 baby pirhanas and i randomly took 5 and put them in each so they are from the same tank and conditions... I admit I don't know the background of them that is
why i got 5 for each for controll
Same light on top
same heater set at same setting (I spent alot on the heater and got a good one for both so i could control the temp)
I test the water regualarly to make sure the water conditions are the same.
Lighting is on a timer-- bulbs are exactly the same as well
both tanks were bought brand new... conditioned and cycled for 3 weeks


My professor has seen and approved my setup and control that I have implimented and said that this experiment is really accurate

My professor and I have sat dow down and tested the water of tank A (the fish eating the flake food) and it is identical to the water in Tank B.

One interesting thing I have also noticed is that Tank B the fish are alot more active and playful where as the fish in tank A just kind of hide in the corner and don't move alot

I will be repeating the experiment again after 4 months of testing (im hoping that tank A survives long enough :S)

These conditions are EXACTLY the same its very interesting actually to see how each tank progresses... the only difference in each tank is the food they are fed
 
If you have any more input on it please send it to me because I really want to get this right and make it as equal as possible... Im really open to suggestions about this... being my first formal experiement... (funded by the school :D).. SO FILL ME IN
 
the sex of the fish or the male to female ratio may alter results.

this sounds like a fish version of supersize me. haha.
 
Use carnivore sticks or pellets by hikari instead of flakes and maybe you will get better results. If you want to beef up your fish quickly, get some zoecon and soak the pellets or frozen food in there. Maybe use it for another test in the future?

Edit: If you get zoecon, get some zoe too and test that out.
 
kk.. never heard of that but ill definatly look into it. The test is for what the AVERAGE aquarium user would use. haha Just above the point where they are so new that each tank they setup they are doomed to fail over time due to not testing water or cleaning haha... From what Iv noticed tho Pirhanas are a VERY hardy fish.

Tell me what you guys think of this... I was told to introduce some other LARGER fish into the tank like a big gourmi or a big chichlid... Just to kinda keep the pirhanas on their toes( or fins ;) lol) that will force them to be more active?? Do you think this will work... and obviously take the fish out when it starts to get attacked by the lil BBP's
 
If you arent willing to listen to good advise then there is no point in this discussion continuing.

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