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#1
04-11-2011, 08:42 PM
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Mangrove Jack in Tanks
just want peoples opinions on how to do it, i think it would be interesting.
how would u convert it from salt to fresh? cheers jack
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PB Bream 43cm- Zman 2.5" GrubZ - Bloodworm 
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#2
04-11-2011, 09:04 PM
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To convert from salt to fresh you would need to very gradually change the proportions of saltwater to fresh (decrease salinity). Over about a month should be more than safe. Just be careful, I remember some guys saying that as they decreased the salinity the fish started getting fin-rot and other infections. This is probably because the fish is using a lot of energy trying to osmoregulate (maintain internal water balance) and this may compromise their immune system slightly.
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#5
04-11-2011, 10:43 PM
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IMO Jacks are one of the hardest if not the hardest fish to convert. You gota go along the lines of adding 10% fresh then add 5% salt then 10% fresh again until it is fully fresh. Just adding fresh to convert jacks stresses them way to much and they eventually die. Have learnt from experience and aquarium shop owners.
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#6
04-11-2011, 11:26 PM
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I had a 40cm jack shipped down from cooktown to Sydney via a seafood distributor. Cost $20/kg and arrived in freezing water with all the coral trout at Mr. Wong's Chinese restaurant. Raised the temps up over about 6hours, then had him converted to full fresh in 24hours. lived for years and eventually made the trip to qld to live out his days in a mates irrigation dam.
Cheers
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#7
05-11-2011, 02:19 AM
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Honestly they are awesome pets,I just used to keep mine in brackish water as for food i used to feed live fish,a type of cichlid pellet as well as occasional frozen prawns etc they are highly aggressive and will eat anything that fits and just kill anything that doesnt.now as for the water the brackish was easy enough,you can mix it up at home from special salt heres some here,remember you want brackish water so it will make quite a bit more cant remember how much i used to use.http://www.guppysaquariumproducts.co...lt/cat_34.html
other than that just good filtration, including biological filtration,there is live bacteria products to get that started quicker,uv lighting and a good heater with a good solid guard and a good sized tank mine was 4ft x18 x18,but should have been larger really and made from heavier glass,just in case the fish cracks the thinner stuff,i know mine used to strike at condensation etc on the cover glass and smashed it, so just keep that in mind when choosing a tank, I know you can get 10mm glass tanks,you can get them quite cheaply just shop around,other than that just make sure to put your whole hand in the tank fast when doing something,dont be slow so just your finger is in there lol they are very tolerant of water chemistry,they arent what you'd call sensitive so theres no real rules to them,just the important things like keeping ammonia low etc,i wish i could help more but it was a few years ago now and my memory aint the best.
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Nitro Ultrabream finesse 1-2kg 6'6'' and Shimano rarenium 2500fa
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#8
05-11-2011, 04:47 AM
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Yeah I have a 100% fresh water jack and he was raised in fresh water. Awesome pets and they real attitude. I feed mine feeder fish and crays and he loved them. Its hard for them to eat crays when they are babies due to all the feelers the crays have, it puts them off. But just keel the crays and break them in half and they learn real quick after that.
Ammonia spikes can come from nowhere so be very careful as this is what killed my fish in nothing more than a perfect tank. Feeding you jack live prey will reduce the amount of toxins in the water that he passes with waste as pellets will be a lot more maintenance. Build him a nice cave out of rocks with a nice big roof, we used a piece of old slate and he will really enjoy his time in the tank. Add a few plants as well to help filter out the toxins. They are quite a playful animal and very very intelligent. They like to play games and what I used to do was move the gravel into lumps each day and he hated that see he used to flatten it back out in some spots and dig holes in others. It used to keep him busy every day I could basically hand feed mine but was still a bit scared to. Here is a pic of mine -  Cheers Lee
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#9
05-11-2011, 05:29 AM
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#10
05-11-2011, 05:53 AM
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Take it you are talking 35cm plus fish.
Tank needs to be established and cycling, if you dont know how the nitrogen cycle works and cant maintain it dont do it. YOU WILL NEED A TEST KIT Water parameters ph 8 to 8.2, ammonia 0, nitrite 0, nitrates < 20ppm. Temp whatever the temp is where you are getting it from. Ammonia and nitrite spikes are the cause of most tank Jack deaths. Easier to set up a brackish tank at 10 ppt salinity than pure fresh with the hard water required to keep a Jack healthy. To acclimate from saltwater 34ppt (may be less in canal/river systems) transport in at least 60 litres of water with lots of airation, do a 1/2 water change every ten minutes for first 1/2 hour ammonia hits toxic levels fast wont kill it straight away but will add to stress of acclimation. Drain 1/2 of water add 1/2 10 ppt water wait 15 minutes then put staight into tank.
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#12
05-11-2011, 06:10 AM
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Lee that photo and set up looks awesome. I used to have a pet Murray Cod in a 3 ft tank in my kitchen and he was way too intelligent always seeking attention. Cheers PAT.
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praise the lord and pass the ammunition 
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#14
05-11-2011, 06:28 AM
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