Where do Jacks Breed..?

[ActiveAngler]

I also think they do the migration,something i have always wondered about though is that they never,in my experience,turn up in cast nets. A lot of other juvenile fish seem to get attracted to the schools of inch long prawns,Queenies,threadies,grunter,moses perch. But in all the years i cast netted heavily,i never got a juvenile jack. Got quite a few legal lacks up in the headwaters where the prawns followed the brackish water,but not once a small one. I know of places we used to see an odd one,and know in mackay where there are a lot of little ones growing in freshwater. But down here it is dammed,so i find it odd i never saw one. Just another piscatorial mystery to fathom i guess..

[spaded]

I can't see a juvienille jack being born in the ocean an then swimming all the way into an estuary system? I have always thought the bigger jacks come into the river systems in the summer months to breed? anyone else noticed in summer you will see tiny lil jacks everywhere from 5cm to 10cm haning around with the lil bream around bridges pontoons etc but you will never see one during the winter months.

[ActiveAngler]

Some interesting reading in the conclusion section here..

http://www2.dpi.qld.gov.au/extra/pdf...t/benefits.pdf

[Pistol_P]

I also think they do the migration,something i have always wondered about though is that they never,in my experience,turn up in cast nets. A lot of other juvenile fish seem to get attracted to the schools of inch long prawns,Queenies,threadies,grunter,moses perch. But in all the years i cast netted heavily,i never got a juvenile jack. Got quite a few legal lacks up in the headwaters where the prawns followed the brackish water,but not once a small one. I know of places we used to see an odd one,and know in mackay where there are a lot of little ones growing in freshwater. But down here it is dammed,so i find it odd i never saw one. Just another piscatorial mystery to fathom i guess..

You can get the juvenile ones in nets here chew.

It would be one amazing little journey if they migrate as fry from the reefs to way way way into brackish creeks.

Pete

[004dam]

So what are the landlocked jacks doing? Would they breed even though they can't escape?

[ActiveAngler]

So what are the landlocked jacks doing? Would they breed even though they can't escape?

Now thats a good point Adam...Not much else to do in a lake

[DEANO68]

i think Kurt up at gladstone would have some good points on this subject..

[Didley]

So what are the landlocked jacks doing? Would they breed even though they can't escape?

I'd suggest not, I believe they'd need salty reef conditions to "get busy", a bit like Bass need to get to the salt.
The only bit I have amazement at, is fry getting from reef to river mouth, and as Ffej said about eels, nature is amazing. There'd be Billions of jacks hatched out there we only need millions to get through!

[Didley]

Now thats a good point Adam...Not much else to do in a lake

Remind me not to go swimming with you in any lakes Chewy

[Genesis]

There'd be Billions of jacks hatched out there we only need millions to get through!

and I just need that one jack to crack my Oz virgin