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

Jade Perch, Tilapia and Lettuce...Common Requirements

Keeping fish and plants together has some basic requirements and important parameters

Digital thermometer in an Aquaponics systemDigital thermometer in an Aquaponics system used to switch electric heaters on and off in a 2 degree range. Temp shown is centigrade.

Water temperature is a very important parameter. If the water temperature gets too high it will knock the plant performance back. The ideal temp for both plants, Jade Perch and Tilapia is 23C ( 73F) as it goes higher or lower the performance of both plants and fish drops off.  Tilapia will still be fine in water up to 30C (86F) and a little way beyond.  Plants will also survive but do much less well, particularly lettuce and the like.

The system water temps do not necessarily follow exactly the outside air temp although they will gradually trend upwards in a succession of hot days. We see weeks of 33 -35C (90 - 95F) here in our South Queensland summer, our nights are usually average around 21C (70F) so over the summer the water temp gradually climbs to level out around 28 - 30C (83 - 86F) Not so bad. Everything works just fine in that temperature range.

The system water in our Aquaponics garden is the nutrient and dissolved oxygen transport vehicle as well as providing moisture for the plants and fish.  In a well designed Aquaponics garden nutrient and dissolved oxygen are continuously moved around and made available throughout the Aquaponics system.  Obviously both plants and fish will do much better when both dissolved oxygen and temperature are at or close to ideal levels.

This last summer we had one week of temps above 40C (104F) with one Saturday to 46C (115F) which was just an unbelievable day.

Hot mate, you could fry an egg on the footpath!

Fried egg.

That day my water temps got to 34C ( 95F) and I lost a number of fish. All big guys too which was very upsetting. I was away for the day so could not do anything about it till I got home just before dark to find fish gasping at the surface and a number of dead fish.

Above 30C (86F) the ability of the water to hold dissolved oxygen drops off rapidly so, result equals fish deaths and plant destruction. Water will only hold half the saturation of oxygen at 30C (86F) that can be held at 0C (32F).

Interestingly, if you can maintain reasonable root zone temps the plants may wilt a bit during a very hot day but will recover rapidly once the evening comes and will still grow and bear fruit in the case of tomatoes and cucumber for example.

So....root zone temperature control is the holy grail of delivering excellent results in your Aquaponics system. Temperature control is equally important in cold climates, winter conditions.  Depending on where you are in the world this can be challenging or not so bad.   We will deal with that in another post.

I hope this is helpful to you.


Posted By Murray Hallam on 11th July 2014

Updated : 11th July 2014 | Words : 518 | Views : 3802

RSS Twitter Facebook


Fish Feed Trial over 12 Months - Outcomes.

FISH FEED TRIALS. A report on the Fish Feed feed trials, they were very successful. The method we . . .

Posted By Practical Aquaponics on 6th June 2023

Views : 991 | Comments : 0

How useful are EC measurements in an Aquaponics system? Treating sick fish?

An EC meter (Electrical Conductivity) is a device that measures the electrical conductivity in the w . . .

Posted By Murray Hallam on 15th January 2017

Views : 63241 | Comments : 6

Fish on Trial

Aquaponics policemen. We have started a feed trial with Jade Perch. The idea behind the 12-month tr . . .

Posted By Murray Hallam on 4th April 2016

Views : 62390 | Comments : 55

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.