Is there an answer to this or opinion?

[megatrev62]

Hypothetically speaking, if 20 fry were placed in a 20 gallon and 20 fry from same spawn placed in a 130 gallon, which of these would produce bigger fish in say a two month period? With the same % water change and exact amount of feedings, with the same food? Am I understanding with the greater volume of water the fry would grow slower in the 130 because they swim more? Just asking because I would like to know the consensus on this. Thank you

[megatrev62]

Bump

[brewmaster15]

The 130 would be a bad grow out tank for such a small number of fry.... for the reason you hypothesized and also because they will feel safer in the smaller tank and feed more aggressively when young.

Hth,
Al

[megatrev62]

The 130 would be a bad grow out tank for such a small number of fry.... for the reason you hypothesized and also because they will feel safer in the smaller tank and feed more aggressively when young.

Hth,
Al

Thank you. Let's just forget about the big disparency in tank size but go with what we'll call a bigger volume of water vs a smaller volume of water with all variables being the same as described would there be a noticeable difference in growth with a larger volume (tank size) of water?

[Pices]

I believe it was Kenny who told me to grow my little ones(3 to 4.5”) Discus in a 75 vs a 125 gal tank. Food is more readily available. They don’t have to expend energy searching for it, it’s right in front of them, therefore they eat more and use less energy. It made sense to me.
Patty

[brewmaster15]

Thank you. Let's just forget about the big disparency in tank size but go with what we'll call a bigger volume of water vs a smaller volume of water with all variables being the same as described would there be a noticeable difference in growth with a larger volume (tank size) of water?

My answers going to be the same. You can't have a bigger volume of water without having a bigger tank. Small numbers of Young fry don't do as well in huge tanks or tanks with large volumes of water as they do in tanks of smaller size / volume.

To be clear its not that you cant use a huge tank to raise fry.. You just can't use it very well to raise a handful of fry. Fill that big tank with several hundred fry and do your water changes and feedings and they will do as well as a small number of fry in a smaller tank.

Its not just the water that matters here...its how the fish behave and interact under different conditions.




I think if you want to evaluate the volume of waters effect on growth you should look at identical 20 gal tanks of fry where you do different amounts of water changes. There I can tell you that you will most like ly see better growth, shape and development with increased water changes if all else is constant..

Water changes in a smaller tank are basically equivalent to a tank with large volume only you dont affect the fry to fry dynamics... if that makes any sense.

Al

[megatrev62]

My answers going to be the same. You can't have a bigger volume of water without having a bigger tank. Small numbers of Young fry don't do as well in huge tanks or tanks with large volumes of water as they do in tanks of smaller size / volume.

To be clear its not that you cant use a huge tank to raise fry.. You just can't use it very well to raise a handful of fry. Fill that big tank with several hundred fry and do your water changes and feedings and they will do as well as a small number of fry in a smaller tank.

Its not just the water that matters here...its how the fish behave and interact under different conditions.




I think if you want to evaluate the volume of waters effect on growth you should look at identical 20 gal tanks of fry where you do different amounts of water changes. There I can tell you that you will most like ly see better growth, shape and development with increased water changes if all else is constant..

Water changes in a smaller tank are basically equivalent to a tank with large volume only you dont affect the fry to fry dynamics... if that makes any sense.

Al

Ok ty, we'll leave it. Wasn't really looking for the proper way to raise fry only the hypothetical above. I hear ya.

[megatrev62]

I believe it was Kenny who told me to grow my little ones(3 to 4.5”) Discus in a 75 vs a 125 gal tank. Food is more readily available. They don’t have to expend energy searching for it, it’s right in front of them, therefore they eat more and use less energy. It made sense to me.
Patty

Thank you.