My guppies are not growing.?

Question

My guppies are not growing. They are now 8 months old and they are still the size of fries. I gave away about 20 guppies and they are all fully grown adults ready to fries of their own. My first batch of guppies grew to be full size adults, but their off spring are not growing at all, or at least the ones in my tank. My tank is about a 20 galloon and I have 6 guppies.

I have been feeding my guppies flake fish food since birth, and the same flakes to their parents who grew up big and healthy.

Answer 1

We could sit and list things important to gupp fry and young growth, but you already know those things. After all, you had one sucessful batch already. What you need to ask yourself is "What is different?" What did you do differently between the two batches, water changes?, food?, filtration? number in the tank? temperature? different parents? Something is different, and that's the key to the lack of growth. If you are like me and can't remember all the details from one spawn to the next, you might want to invest in a small notebook and write down the important facts when you get a spawn. What is the tank temp, size and filtration, number of fry at day one and number at day 10 etc... also what you feed them, how often, your water changes, how much and when... all of the details you can think of. Also records their growth rate make a careful guess of how long they are, or even place a ruler against the glass and way for one to swim close so you can estimate the size. Then when one doesn't work out, you can compare your notes and see why.

MM

Answer 2

I'm going to take a wild guess and say that the reason they are not growing is that you haven't done any partial water changes since the first batch grew up and had fry of their own.

Regular (weekly) partial (25-30%) water changes and good high protein food are what makes baby fish grow into adult sized fish. If you don't do either or both the resulting build-up of ammonia, nitrites and nitrates will stunt the growth of any fish.

Not doing partial water changes is the reason that the myth of fish only growing to the size of their tank got started. When the hobby was first getting going in the US people did not know about doing regular partial water changes to keep their fish healthy. It turned out to be the most important thing you can do to keep your fish healthy and happy and your tank water clean and clear.

Answer 3

i feed my fry a liquid diet called SMALL FRY, made by WARDLEY, in a 30g tube there is min 6.0% protein with a whole heap of other ingredients including egg product, yeast extract, citric acid etc, etc, few too many to mention here really, i feed them this for the first week, then i start to feed them fish food granules that i crush into almost a powder so the dont get the granules stuck in their mouth. Within 3 months they are huge. Fish get worms too, something to look into, although i havnt heard of this in guppies....yet.

Answer 4

High levels of Amonnia, Nitrite and Nitrate will stunt the growth of young fish

Answer 5

feed high protien food, not just flakes.
you can get a variety of them at good pet stores
or you can make your own with boiled, ground egg yolk with a drop of water.

Answer 6

hmm could you edit on what your feeding them?