Backyard Aquaponics
A place to discuss aquaponics

Could you weigh a fish swimming in a small tank, take it out and note the difference?

what like a bucket?

plus all the splash . Best time to weigh them is when you have killed them . But if it is necessary to do before - most will stay still enough to put on the scales in a container for a couple of seconds, I have found.

thats what we used to do in science class. don't see why not.

best done when they are in their ideal temperature conditions. handling them causes stress, and if they are already stressed it might mean disease or death.

when my silvers are stressed due to temp i find that if i net one to have a look at it then i usually find a dead one the next day.

high or low temp stress steve?

either

think XX normally just chucks his out because he like buying new/more fish!
Sardines in a F/glass box

I don't see a lot of need to weigh them before eating anyway. Some may feel it is a good thing to do to calculate optimum feed amount or something - but this is so hit and miss anyway due to variation and stuff, who would bother. As for weighing to measure growth - well they aren't going to grow any quicker by weighing them, more likely to die though (as steve points out).

It's only really for bragging rites "mines bigger than yours" sort of thing.

Ant there's nothing wrong with healthy competition KE... My silvers are reaching 100mm some of them :-) Yay :-) Dunno how much they weigh though :-)

I would weigh mine on a regular basis for research if I could be bothered. Would have to tag em... which could be tricky...

Hi everyone, I have not logged on for several months. My system is going fine, except there has been big problems with grubs and insects this summer. Have lost approx half of tomato crop to grubs and fruit fly. I assume it is because of the very wet summer we are having here in SE Qld.
The usual methods I employ to control them, ie Dipel and Seasol do not keep the insects completely at bay.
Have others has similar probs?

Those bugs must love you and ya veggies!
Pestalince--Ther cam a privee theef men clepeth Deeth,
That in this contree al the peple sleeth,
And with his spere he smoot his herte atwo,
And wente his wey withouten wordes mo.
He hath a thousand slayn this pestilence.
AKA Khama

I have since set up a second system that has s big silvers and 3 jades in the bottom 1000 ltr tank. All these big fish are over 1.5kg in size and are 18 months old now. I have my 450 murray cod in the fingerling tank above. That system is growing some really fantastic corn. Two cobs per corn plant with some yielding a third small cob.

1.5kg - are you thinking of going into the hatchery side of the fish Muzz...you got some around 1kg about 12 months back, are these the same ones

I eat mine when they get to ~500 grams and keep turning over the fish, lot cheaper in fish food