Raising livebearers to their full size seems to be proving hard. - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 32 Old 09-01-2010, 01:03 PM
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Different lighting levels? Only on or off :(

I feed them 4 to 8 times throughout the day between 8 AM and 12 AM. I never feed them less than 4 times. Since I woke up (it's 1:20 here right now) I've already fed them thrice; I keep a close eye on them.
I mean is the lighting level different in the netted off area to the main tank?

I'm thinking it may be out of the way of the light.
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post #12 of 32 Old 09-01-2010, 01:59 PM Thread Starter
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Oh, no. The light is the same. It's a 25 gallon tank, not too big.

I was thinking you meant one of those awesome lights where you can change settings... forget what they're called.
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post #13 of 32 Old 09-01-2010, 02:10 PM
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Is the temperature the same? Fry grow faster the warmer the water.

If you want to continue removing fry from the main tank, then turn up the filter (or use a larger one) to create water movement...
(Will act like a 'treatmill')

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post #14 of 32 Old 09-01-2010, 02:48 PM Thread Starter
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There were 15 fry in the net. I just removed 4 of them and let them go free.

They were way too used to protection, and nearly got eaten by the adults. They quickly hid away in the moss (java moss EVERYWHERE in the tank).

Hopefully they'll live.

I raised the temperature bit by bit over the last 2 weeks. It *was* 22 celcius, today it's 27.
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post #15 of 32 Old 09-01-2010, 05:00 PM
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None of the above seem exactly correct.

The reason why some fry grow fast and the others slow is because fry release a growth stunt hormone into the water they are in. Some of the bigger ones release more into the water resulting in the rest being stunted.

The simple solution is 50 - 60% water changes with aged water. You can ask many Angelfish and Discus breeders about this. This dilutes the stunt hormones making them weaker and useless.

This goes for bettas, gouramis and most,if not all, freshwater fish.

Tank size is important. Light plays no role in fish growth whatsoever but is important nevertheless.

Growing fry in green water should prove beneficial!

Regards

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post #16 of 32 Old 09-01-2010, 05:16 PM
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Hello. I too have noticed the same thing. I think it may well be a matter of available space. I had some swordtail fry that I kept in a net breeder while one was swimming free. The free swimmer is now an adult, the two in the net never did seem to grow so I finally released them into the tank. Unfortunately, I never saw them again.
Currently, I have about 20 molly fry in a 5 gallon tank. Most are going to the oscar, but I do have a home for 3 of them when they get big enough. All the fry were born at the same time, but some are bigger than others. I think in the interest of surval of the fittest, the oscar will get the small fry.

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post #17 of 32 Old 09-01-2010, 05:19 PM
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None of the above seem exactly correct.

The reason why some fry grow fast and the others slow is because fry release a growth stunt hormone into the water they are in. Some of the bigger ones release more into the water resulting in the rest being stunted.

The simple solution is 50 - 60% water changes with aged water. You can ask many Angelfish and Discus breeders about this. This dilutes the stunt hormones making them weaker and useless.

This goes for bettas, gouramis and most,if not all, freshwater fish.

Tank size is important. Light plays no role in fish growth whatsoever but is important nevertheless.

Growing fry in green water should prove beneficial!

Regards

TankMaster
Please consider the science behind growth.


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post #18 of 32 Old 09-02-2010, 04:55 AM
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I used to breed Angelfish and what you're saying is very true, frequent water changes are vital to good, even growth across the brood. That doesn't explain why one batch will grow more slowly that another batch in the same water though.

I don't have any experience experimenting with light levels and growth but that was the advice given from an experienced livebearer breeder.

Last edited by Marginatus; 09-02-2010 at 04:58 AM.
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post #19 of 32 Old 09-02-2010, 05:07 AM
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Originally Posted by Marginatus View Post
I used to breed Angelfish and what you're saying is very true, frequent water changes are vital to good, even growth across the brood. That doesn't explain why one batch will grow more slowly that another batch in the same water though.

I don't have any experience experimenting with light levels and growth but that was the advice given from an experienced livebearer breeder.
Maybe 1 batch had weaker growth stunting hormones? This is what I see it to be.


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post #20 of 32 Old 09-02-2010, 12:59 PM Thread Starter
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I see two of the four fry I release swimming around, but not the other two. They might be hiding, but I hope I didn't send them to their death!
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