Backyard Aquaponics
A place to discuss aquaponics

I am a bit confused about if you do or don't need a translocation approval when purchasing fish.

We didn't need one when getting the Barra fingerlings from Freo Tafe. We didn't need one when getting the SP's from Woodvale Fish & Lily Farm. We didn't need one when getting goldfish, koi, sp's and others from local pet shops. I didn't even need one to get marron posted to me from True Blue Marron.

But we are being asked to have one ready when we pick up some rainbow trout fry from King Trout cafe next week.

I don't mind filling in the form but many of the questions seem irrelevant to our purposes.

Can anyone give me some more info on this please?

Technically speaking you are supposed to get translocation approval before moving any non native fish in WA. The onus of this is left up to the purchaser (of the fish) who is usually none the wiser so it dosent happen. I do know that the Fisheries Dept are in the process of reviewing the whole translocation policy so maybe this is a sign of things to come. On the other hand King Trout have new owners and perhaps they are not familiar with the process either.
Good luck getting the Trout Fry through the summer, do you have ways of keeping your water cool?? Also be aware that some of the fry from King Trout originated from eggs brought in from Tasmania and these fish are going to be even less heat tolerant than the local strains.

Here's some more reading for you:
http://www.fish.wa.gov.au/docs/pub/Tran ... 3.php?0505

Thanks for the info Troutman, appreciated.

Yeah, we've got a tank set up with an underground cooling system. This will be the first trial of it over summer, fingers crossed.

King Trout have offered us standard rainbows or triploids. Do you know if the triploids would be the ones from Tas?

They didnt breed any of their own fish this year so everything was bought in, both locally and from Tas. I also know that the triploids and diploids got mixed in together at the fisheries dept hatchery when they had a HSM happen so if they sourced their Triploids from there your going to have diploids in with them.

You are the man in the know, thanks again

How does your underground cooling system work??

This is hubby's project but from what I understand it works by continuously running water through pipes buried underground. These pipes then run through the fish tank to act like a cooling radiator I guess. No GB's on it yet, just a bio filter which should also help keep it from heating up.

We have fairly mild weather in comparison to Perth. We do get the odd hot day over summer but then it's cool again the next day. The weather seems to be getting more unpredictable though.

It will be interesting to see what temps we can maintain in this new system over summer.

I dont think running water thru the pipes underground will help much with the cooling, FF tried this a few years back and it didnt work. If you want to keep it cool I wouldnt connect up the growbed, just stick with the bio filter.
Yeah every year is different temp wise and these days anything is possible. Looking at the charts you average 3 days a year over 40C which is the same as Perth though like you say your average temp over the summer is much lower so you might be able to do it, time will tell I guess.

Thanks Troutman. No doubt I will provide updates through the forum on it's progress.

How deep and how long are the pipes?

Good question!?

I think there are 12 x 1" poly pipes, each are 25m long buried about 800mm deep. He said something about the volume being double the surface area of the fish tank....???

The fish tank is also buried an everything undercover.

Might still need to throw in a bag of ice on those few 40+ days though

I will post pics and updates on my system thread soon

Interesting concept..

It sounds Like a similar system used for keeping house Temperatures Constant.. But I don't think you have enough Pipe work in the system..

Ok, here is the Shocker thou..

"buried 1.5 to 3 m (5 to 10 ft) underground where the ambient earth temperature is typically 10 to 23 °C (50-73 °F ) all year round in the temperate latitudes where most humans live. Ground temperature becomes more stable with depth."


This comment is from..
http://en.wikipedia.org/wiki/Ground-cou ... _exchanger
They are talking about Air Cooling but the information is Valid as it talks about stability of ground Temperature..

Another Factor is the Length's of Pipe needed for the system to work effectively.. They are talking about 100's if not 1000's of Feet of Piping..

In the US of A and Europe they actually Dig up Vast area of ground to Bury the loops of Pipe.. No joins at all so there is not any risk of ground contamination..


The whole idea is sound But I think a Bit of research needs to be Done..


I personally Like the system for Building a House that has the ability of Being Passively/Actively cooled with out the requirement's of Air conditioners.



Hope this Information Helps you..

Juergen

From what I have read, you will need hundreds of meters of buried pipes to cope with the total heat rejection that you require.