Perth WA

captplanet

Thanks for the confirmation PLJ!

I think from a purely self sustaining standpoint (fishwise) in a backyard set up, a high failure rate for breeding might not be that bad a thing as SPs apparently spawn thousands of eggs which would quickly upset the balance.

Personally, it'd be great if out of the thousands, only 30 or so make it to plate size...drool

BTW, I don't suppose he measured the before and after water levels? It would be good to know exactly how much the water levels need to rise before it happens.

Also, would it be possible to trick them by flushing then repumping the water back in? Natural methods sure sound better than pumping hormones....

I read somewhere that man boobs are caused by eating hormone pumped chickens....!!!!

RupertofOZ

PLJ wrote:

I have a mate with large Silver Perch (Bidyanus bidyanus) who has witnessed them breeding, typically after pumping a lot of water into his dam, thus creating rising water levels as you say, captplanet.

That's only one of the spawning triggers...

Quote:

The injection of hCG (human chorionic gonadotropin) will quickly induce egglaying and thus maximise your chances of producing a decent batch of fry at a time when you are ready to care for them.
I am yet to give it a go so am not speaking from experience, but that is my understanding of the basic theory.

Yep... that's the basic theory... and the easy part...

Getting the fertilised "egg" to fry is the hard part.... and involves a constant 24 hour supply of artemia and/or algae.. to get them to a few weeks old... then out into ponds... where are succession of micro-organisms is required for them to get any where near beginning to feed them a "crumble"...

Quote:

.. and any fry that might result do not have the necessary volume of zytoplankton and flora required to get them started.

And there's the nub... :lol:

captplanet

RupertofOZ wrote:

PLJ wrote:

I have a mate with large Silver Perch (Bidyanus bidyanus) who has witnessed them breeding, typically after pumping a lot of water into his dam, thus creating rising water levels as you say, captplanet.

That's only one of the spawning triggers...

Quote:

The injection of hCG (human chorionic gonadotropin) will quickly induce egglaying and thus maximise your chances of producing a decent batch of fry at a time when you are ready to care for them.
I am yet to give it a go so am not speaking from experience, but that is my understanding of the basic theory.

Yep... that's the basic theory... and the easy part...

Getting the fertilised "egg" to fry is the hard part.... and involves a constant 24 hour supply of artemia and/or algae.. to get them to a few weeks old... then out into ponds... where are succession of micro-organisms is required for them to get any where near beginning to feed them a "crumble"...

Quote:

.. and any fry that might result do not have the necessary volume of zytoplankton and flora required to get them started.

And there's the nub... :lol:

Sounds like a bloody pain in the bum :cry:

RupertofOZ

If it was easy... everyone would be doing it... :lol:

Read up on Monya's thread... he tried to bred them... and had huge amounts of problems...

Even after attending a hatchery course... and having all the gear... and gow out ponds...

faye

I asked the question late one evening about breeding silver perch. Never again, I nearly fell asleep listening to the answer about the whole process.

Charlie

I too have read a lot into it. Seems to be a very difficult thing to achieve at home.

A friend of mine had some old aquaculture tanks up the back of their block that had yabbies and SP etc in them but after the whole system got decomissioned only a handful of 3 or 4 year old perch were left to fend for themselves. Years later a visitor was gorking around the property and asked the question how long the little fish had been in the tanks up the back. After inspection there were a large number of SP fingerlings found.

Everyone was a bit puzzled. :dontknow:

captplanet

Charlie wrote:

I too have read a lot into it. Seems to be a very difficult thing to achieve at home.

A friend of mine had some old aquaculture tanks up the back of their block that had yabbies and SP etc in them but after the whole system got decomissioned only a handful of 3 or 4 year old perch were left to fend for themselves. Years later a visitor was gorking around the property and asked the question how long the little fish had been in the tanks up the back. After inspection there were a large number of SP fingerlings found.

Everyone was a bit puzzled. :dontknow:

Oh u teaser u...!!

Backyard Aquaponics A place to discuss aquaponics

Perth WA

Backyard Aquaponics
A place to discuss aquaponics