finley Posted October 23, 2008 Report Share Posted October 23, 2008 Hi I've been reading about the hormone that fry excrete which limits their growth. Some say that it's to limit their siblings' growth, but that doesn't really add up; it makes more sense that the hormone is how fish limit their growth to the size of their environment. Anyway, that's why very large daily water changes seem to do so much to improve growth rates of fry... So, scratching my lazy head, I'm thinking that rather than doing all that work is there not some material that will absorb the hormone from the water? Will carbon do it, or zeolite, or something along the lines of Purigen? Thanks, Finley Link to comment Share on other sites More sharing options...
splendidbetta Posted October 23, 2008 Report Share Posted October 23, 2008 All of the above is possible, but I have yet to encounter any supporting evidence for either claim :( Link to comment Share on other sites More sharing options...
Chuckie Posted October 23, 2008 Report Share Posted October 23, 2008 ooh, a pheromone conversation! Where's Peter J? Link to comment Share on other sites More sharing options...
Bettarazzi Posted October 23, 2008 Report Share Posted October 23, 2008 Funnily enough I was just talking to someone yesterday about this very same thing. He had 2 tanks of cichlid fry and he'd used some kind of resin material in one of them. He said he noticed a difference in the fry growth. But it wasn't exactly a scientific study. Link to comment Share on other sites More sharing options...
finley Posted October 23, 2008 Author Report Share Posted October 23, 2008 Ooh, ooh, what kind of resin? Ask him, ask him!! All 'scientific' studies comprise the same 'anecdotal' evidence as any other mode of study; it's just that it's all lined up neatly so we can have a good gander at it . We've always got to start somewhere! Fin. Link to comment Share on other sites More sharing options...
Bettarazzi Posted October 23, 2008 Report Share Posted October 23, 2008 He couldn't remember what it was called. He said it turned brown very quickly. It wasn't an aquarium product. It was something they use to filter drinking water. He bought it in bulk. Link to comment Share on other sites More sharing options...
Rod Posted October 23, 2008 Report Share Posted October 23, 2008 Best solution is regular water changes.... Link to comment Share on other sites More sharing options...
Bettarazzi Posted October 23, 2008 Report Share Posted October 23, 2008 I think Finley's after the 2nd best lazy man's solution. :lol: Link to comment Share on other sites More sharing options...
Canfeleq Posted October 24, 2008 Report Share Posted October 24, 2008 aren't we all.... :lol: Link to comment Share on other sites More sharing options...
y2jdaze Posted October 24, 2008 Report Share Posted October 24, 2008 cheers to that lol Link to comment Share on other sites More sharing options...
finley Posted October 24, 2008 Author Report Share Posted October 24, 2008 Bettarazzi, you understand me well. I must find out! So, drinking water stuff, in bulk (from where?), turns brown... [head scratch] That's narrowed it down a bit. Not a lot, but a bit. Fin. :lol: Link to comment Share on other sites More sharing options...
splendidbetta Posted October 24, 2008 Report Share Posted October 24, 2008 Ooh, ooh, what kind of resin? Ask him, ask him!! All 'scientific' studies comprise the same 'anecdotal' evidence as any other mode of study; it's just that it's all lined up neatly so we can have a good gander at it . We've always got to start somewhere! Fin. No. Scientific data is not just anecdote. Scientific experiments are controlled in order to eliminate all variables that could interfere with producing the actual results. The only way in which scientific evidence is anecdotal is in the accuracy of the instruments and set up of the experiment. Anecdote is not controlled and as such should not be used to make empirical claims. This is an excellent applied explanation of the differences: http://www.sciencebasedmedicine.org/?p=33 :D Link to comment Share on other sites More sharing options...
Bettarazzi Posted October 24, 2008 Report Share Posted October 24, 2008 I think most of those kinds of products change colour when they get full of the stuff they're taking out. They can usually be recharged in either brine or bleach depending on the product. I think you'll find Purigen will do the same thing. Link to comment Share on other sites More sharing options...
Chuckie Posted October 24, 2008 Report Share Posted October 24, 2008 water changes are not the best solution when you have Death on Tap, like me. Link to comment Share on other sites More sharing options...
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