All times are UTC + 8 hours




Post new topic Reply to topic  [ 7 posts ] 
Author Message
PostPosted: Feb 7th, '19, 11:35 
Offline

Joined: Feb 7th, '19, 11:19
Posts: 3
Gender: Male
Are you human?: yes
Location: Adelaide
hi all,

My eel tailed catfish have been fine since i introduced them to the tank ~ 2 weeks ago.

I've been feeding them every few days with a beef heart and prawn mix (not too much yet to let them settle in, system is pretty new also).

So last night I fed them with the new 2mm aquaponic feed pellets I got and this morning three of the larger ones are dead.

My assumption is that the 2mm was too big for the ~5cm fingerlings. Does this sound plausible? Could they die from this?

A bit more system info below:

- Tank size 800L
- growing media 250L of expanded clay
- Number of fish 21 at 5 cm (will reduce this number to around 12 once they start getting bigger)
- pH 8.2
- Amonia, Nitrite, and Nitrate 0ppm

Any thoughts would be greatly appreciated!!


Top
 Profile  
Reply with quote  
    Advertisement
 
PostPosted: Feb 8th, '19, 11:21 
Offline
Site Admin
Site Admin
User avatar

Joined: Mar 12th, '06, 07:56
Posts: 17768
Images: 4
Location: Perth
Gender: Male
Blog: View Blog (1)
pH is pretty high, there may have been a little spike in ammonia, this would affect them quite a lot at that Ph and I'm guessing being in SA your water is pretty worm as well. Were they eating?

Image

_________________
www.havehomewilltravel.com
Life on the road


Top
 Profile Personal album  
Reply with quote  
PostPosted: Feb 9th, '19, 20:51 
Offline

Joined: Feb 7th, '19, 11:19
Posts: 3
Gender: Male
Are you human?: yes
Location: Adelaide
Thanks for the reply earthbound.

They were eating but I didn't check to see if they'd finished all the food so there may have been some left the water.

Can ammonia spike and then go back down to zero the following day? Because I checked the ammonia the next day after I found them dead and none was showing up.

I've read on another thread that catfish should be ok with the pellets so the only thing I thought could be an issue was the size?? I really have no idea but I'm very reluctant to feed them the pellets again until I work out whats going on!


Top
 Profile  
Reply with quote  
PostPosted: Feb 10th, '19, 05:02 
Offline

Joined: Dec 22nd, '18, 12:28
Posts: 5
Gender: Male
Are you human?: yes
Location: South Australia
Hi pdogg

I have about 120 eel-tailed catfish which I have had for about 3 weeks and have fed them on pellets ranging from 1mm up to 3mm and 3 different brands (they prefer sinking but will come to the surface for floating pellets). They always eat everything, I have only had a couple of deaths and that was because they jumped out of the tank (have netting on tank now). I have them in a Aquaculture system which was still cycling with ammonia at 0.25 and Nitrite at 0.5 but the ph is about 6.5 to 6.8, temp 26-28 (because I have Barra in the same system). I also keep the salt at about 1300ppm (obviously you wouldnt want to do that in Aquaponics).


Top
 Profile  
Reply with quote  
PostPosted: Feb 10th, '19, 06:55 
Offline
Site Admin
Site Admin
User avatar

Joined: Mar 12th, '06, 07:56
Posts: 17768
Images: 4
Location: Perth
Gender: Male
Blog: View Blog (1)
The Ammonia won't disappear overnight but the spike could have happened days before. Still, could be sooooo many different things, though unlikely to be feed.

_________________
www.havehomewilltravel.com
Life on the road


Top
 Profile Personal album  
Reply with quote  
PostPosted: Feb 10th, '19, 11:44 
Offline

Joined: Feb 7th, '19, 11:19
Posts: 3
Gender: Male
Are you human?: yes
Location: Adelaide
yeah just seemed like the feed was the issue as it was the only changed variable but perhaps just a coincidence...
I think ill just experiment with adding a little of the pellets and see what happens.

I imagine the pH will decrease as the system matures?

Thanks for your insight mv1973, its good to hear from others who have the catfish because I found it a bit harder to find information on them (they don't seem as common as other species). All the best with them!


Top
 Profile  
Reply with quote  
PostPosted: Feb 11th, '19, 04:13 
Offline

Joined: Dec 22nd, '18, 12:28
Posts: 5
Gender: Male
Are you human?: yes
Location: South Australia
I lost about 20 silver perch once for no known reason, all water parameters were fine and it was a mature system and no high temperatures. The only thing I could put it down to was a chance that I had handled poison before I fed my fish (or perhaps spray drift). I lost one the other day as well in that 47 degree day we had, water temp got over 30 degrees. I should have turned off the water to my grow beds, I now will be going for a split system to make this easier.

I hope any of this helps, I have found catfish extremely tough (except when they fall 1.2 metres onto a concrete floor).


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 

All times are UTC + 8 hours


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

Powered by phpBB® Forum Software © phpBB Group
Portal by phpBB3 Portal © phpBB Türkiye
[ Time : 0.063s | 17 Queries | GZIP : Off ]