Backyard Aquaponics
A place to discuss aquaponics

What's the minimum temp for silvers?

Around 5 or 6 degrees I think, I have had them at that a few times.

Mine are still slowly dying swimming around on their backs and sides or not at all, water temp yesterday arvo was 13 deg.
I have a couple of spots where the galv is showing in my FT also I have tek screws (nikel plated I think, not galv) 1 on each join of pipes (alternative to glue) but only on essential joins I dont want to come apart, total of 4. Would these couple of things contribute to the deaths.
As I said before the deaths are very slow, over about a day to fully cark it, the affected fish swim very slowly or not at all, and when they do they have trouble staying upright.

Don't think 13 deg. water temp would be the problem, I used to have SP in a farm dam which used to get ice on it in winter.

i have only just put 8 in my tank on Sunday and i cant see the bottom to tell how they are their tiny little buggers...
No floaters or ammonia spikes so im assuming their still kicking.

I tried a search for the effects of galv poisoning here but found nothing. Does anyone know what my fish would do if they were affected by galv in water
As I dumped water to get out trout I resalted to 1ppt, put in seasol and chelated iron to try get water back good for fish health and plant growth / health.
Hope it wasnt to much adding in at once as did them all this arvo.

galvanized is not good, it will leach some nasties into your system, i think i read an excellent post on the board about it being the zinc

Can you get a good pic of one of them.... They don't have very fine, very small white spots on the fish do they? Sometimes Ich can be hard to see..

Are you getting a bit of slime or froth on the water surface? Like the fish are producing excess slime coat? Any extended stomachs or bulges on the fish at all?

I will take a pic of the next casualty.
But they seem to be healthy looking, I havnt noticed any white spots and no froth on water.
They are a little patchy in colour though, ie some dark areas on them, a bit like bruises.
I guess I havnt taken photos as there didnt seem to be anything unusual or obviously wrong with them.

Well I am now pretty sure that my fish are dying from galv poisoning or the nikel plating from 4 screws holding 4 joins together.
I kind of wish someone would reply to my questions about galv poisoning and what and how the fish may die, ie symptoms.
As my GBs are galv as well it looks like I may may need to totally rebuild with IBC or something else. Would get BYAP gear but cant afford at the moment.
Still loosing fish and will check all params tonight but were all good a couple of days ago.
Camera not working so cant take pics.

Hard to imagine 4 screws could degrade that much or quickly to adversely affect the fish, IMO

So your GB's are Gal steel? Reckon this could be a problem, its not healty for humans either, if you have a gal water tank it should be lined. Mind you the frames of IBC's are gal although not in direct contact with water.....

skipd, read this thread:
viewtopic.php?f=8&t=4919&hilit=zinc+fish

Galvanised tanks are designed to stop iron rusting by coating it with zinc. The zinc is more chemically reactive than iron, and will enter solution (water) instead of iron.

They are galv but I have them coated with bitumen paint. The paint has worn away in a couple of spots from colourbond sheets i had in bottem of tank.
I think it may be time to bite the bullet and buy a proper BYAP FT.

I read that thread BTB and was interesting, makes me think that galv is responsable even more, cheers.