Backyard Aquaponics
A place to discuss aquaponics

Thanks for your help.
Another ten dead this morning:(
I upped flow rate and set up a hospital tank for salting.

The photo is of all I took out in the morning but some might have died 12 or so hours ago.
What's your thought?

Here is a live one

Do they look underfed?

And some of them have a weird curve to their bodies, but I'm not sure if that's a thing.

They are smaller then the live ones and have thin bodies.
The swollen gill can be bacteria after they died.
The live ones are behaving normally, going for the feed fine and are distributed throughout the tank and seem happy.

Maybe it is just that stage when they die off not having learned to feed.
I will invest in some more literature and read up about this specific stage.

The rain (my grow beds are not covered) has played with the ph a bit and that was when the mortality went up.
Dropping to 6.2 then balances out at 6.8.

they do look skinny compared to the live one who looks like he has taken to feed brilliantly. But i doubt you would be losing 10 a day for that reason.

what brand and size is your first feed diet? we usually use a 0.3mm skretting.

That's what I am using.
I have isolated a group now in an aquarium and see a big size difference in them.
Only lost 2 more the last 12 hours.

I think, hope I fixed them!
I have drained tank 1 (with the fry) down to just below 200l, stopped feeding and salted to 12ppt. Added 200l and left for another hour and then opened to the gb cycle (400l wet + sump) and started feeding as usual.
12h later no mortality and active feeding.
Should give me a reading just below 3 in salts for the system...
I'll tell you how the strawberry likes it:)

I have also decided to cover the system to avoid unwanted rainwater and birds and so on.....
Have a greenhouse coming:) and will redesign that setup...... Another thread to come!

Thanks for sharing your progress Ben, interesting.

Fish are happy, so am I!
No more death and all feeding fine.
I took a random one out and measured 34mm.

Next I will disconnect the chiller and see how they cope with day and night fluctuations.

Nice.

that looks great mate. Our salmon are only just starting first feed now, so your beating us and we are a commercial hatchery trying to go as fast as we can. Fish distribution and water speed all look immaculate.

Do you plan to keep going as fast as you can or are you going to slow down and keep them small over summer? or just run your chiller / air stones?

Great pic!

Great thread guys

Must be the temperature speeding them up. Or the magic of aquaponics;)

I will feed them to their appetite and see how they grow. I will start grading them in a few weeks and separate the larger ones to the second tank.

Spring is here and I start to build up an evaporation tower like I used for trout last summer. (Car radiator fan on top two 200l barrels with patio mister system ontop the sump tank) works really good.