2mm and 6mm fish food are now in stock as at 1 Jan 2023 December View Fish Food

Can I Use Galvanised Tanks for Grow beds ?

Galvanised tanks are coated with zinc. Over time the zinc coating oxadises and is leached into the water body, and zinc is well known to cause problems for fish.

The use of Galvanised tanks goes against common accepted knowledge and also a lot of research that can be easily accessed.
The way in which zinc affects fish is death by tissue hypoxia.
Below is some exerpts from a scientific jounal that should prove to be interesting on the subject.

Acute zinc toxicity to rainbow trout (Salmo gairdneri): confirmation of the hypothesis that death is related to tissue hypoxia Burton, DT | Jones, AH | Cairns, J
Journal of the Fisheries Research Board of Canada [J. Fish. Res. Bd. Can.]. Vol. 29, no. 10, pp. 1463-1466. 1972.

"Acute heavy metal toxicity to fish has been attributed to the coagulation or precipitation of mucus on the gills and/or to cytological damage to the gills. The physiological mechanism of death by either of the above causes is related to a breakdown in gas exchange at the gills. This study of acute zinc toxicity to rainbow trout (Salmo gairdneri) supports an earlier hypothesis that modification of the gas exchange process at the gills creates hypoxia at the tissue level. Tissue hypoxia appears to be a major physiological change preceding death once the gas exchange process at the gills is no longer sufficient to supply the oxygen requirements of the fish."

Hypoxia is a condition of oxygen reduction in humans and animals. As an example, mountain climbers can suffer hypoxia when climbing at altitude, which causes initially disorientation followed by nausea then ultimately death.

Research shows that as little as 35 thousandths of a thousandth part can be detrimental to fish.
So the fish will die exhibiting the same symptoms as if there is lack of dissolved oxygen in the water.
I would suggest that some folk have gotten away with using old galvanised tanks to date, because they have been raising Tilapia which are well known to be able to tolerate poor water quality and low DO levels.

Trout or Barramundi are at the other end of water quality needs and would quickly succumb to zinc poisoning if placed in a system that had galvanised tanks or grow beds..

Posted By Murray Hallam on 12th December 2011

Updated : 4th October 2013 | Words : 376 | Views : 3065

RSS Twitter Facebook


Is the Pipe Poisonous?

Many ask the question about PVC pipe, should I use it in my home or commercial project. Most folk us . . .

Posted By Murray Hallam on 31st July 2015

Views : 62850 | Comments : 21

Tech Talk Introduction Video

Tech Talk Introduction video. Secrets1 from Murray Hallam on Vimeo. Join now to see Tech Talk vi . . .

Posted By Murray Hallam on 18th May 2015

Views : 61293 | Comments : 0

Tech Talk Video Collection

Cotton Wool Disease in fish. Secrets from Murray Hallam on Vimeo. I want to start a farm. S . . .

Posted By Murray Hallam on 18th May 2015

Views : 61245 | Comments : 10

Share with Us


Additional Information


Murray Hallam is probably the best-known face in the world-wide Aquaponics movement. Murray is by nature an innovator and in his Research & Development facility has perfected many new methodologies for commercial farm Aquaponic systems.


Learn Aquaponics

At Practical Aquaponics, we have a range of information suitable for the novice to the expert. Browse our blog, register for our Aquaponics Courses, Workshops and Seminars or buy kits, books, DVDs and many other aquaponics necessities in our shop.


Aquaponics Kits & DIY

Proven and tested, there are hundreds of our kits in operation in every state of Australia and we have exported our kits to the USA, Hong Kong, New Zealand and Nassau. The wonderful thing about Aquaponics is that almost anyone can participate and get to grow some clean, healthy vegetables and fish.



Everything you could possibly need to set up an Aquaponics farm or home system is found in our online store. Whether you are looking to do Aquaponics in Brisbane, Perth, or anywhere in between, we’ve got you covered with the best range of products Australia-wide.


Featured Products

Aquaponics Grow Bed 585 Litres

Aquaponics Grow Bed 585 Litres

Our 585 Litre Grow Bed Is Back! Manufactured Specifically For Aquaponics. Made In Australia From Fibreglass With Marine-grade Gel Coating And Resins. ...

from $847.00 buy online

Indy 23 System - Plans And Building Instructions

Indy 23 System - Plans And Building Instructions

Feed Four People Year-round With The Indy 23 Aquaponic System! Build Your Own, Using This Step-by-step Instruction Set. ...

from $395.00 buy online

Consultation With Murray Hallam

Consultation With Murray Hallam

If You're Working On An Aquaponics Project (or Thinking Of It), A One-hour Consultation With Murray Hallam Can Help Clear Up Some Of The Questions You ...

from $170.00 buy online

Call our team today on 07 4156 5368

For all things Aquaponics ... Practical Aquaponics is your number #1 choice for products and information. Give us a call or drop us an email about your farm project today.