mhaigh

Dead Hybrid Bluegills in my iAVs Fish Tank

6 posts in this topic

I have found a dead 5" hybrid bluegill on Sat 4-9-16 and another on Monday 4-11-16, floating on the water in my IBC fish tank connected to my iAVs system.  The BG have been in the system since mid-November when they were introduced at about 1" fingerlings.....roughly (100) fish.

 

Here is a cut & paste from my http://aquaponicsnation.com/forums/topic/9675-iavs-in-oklahoma/#entry77026 thread.

 

"Regarding the hybrid BG, the growth has been sporadic, out of about (100) 1" fingerlings that I introduced back in mid-November, I have roughly 1/3 that are about 5" long, 1/3 that are 3-4" long and 1/3 that seem stunted....maybe only 2" long. 

 

I have not been very systematic on my feeding, my work schedule sometimes doesn't leave me much time to care for the system.  Since I have not heated my FT, there were probably 50 days since mid-November where I didn't even feed the BG since the water temp was below 55F.

 

....on a side note:

I have had 2 BG dead in the last 3 days, not sure what is going on.  I am going to start another thread with a couple of photos and see if Kellen, Cecil or another of the BG specialists can comment."

 

post-1196-0-52618300-1460469174_thumb.jppost-1196-0-47482100-1460469185_thumb.jppost-1196-0-39425600-1460469193_thumb.jp

 

The rest of the tank this morning (4-12-16) appeared to be frisky and hungry.

FT temp is 72.5F

Amm - 0.25

NO2 - 0

NO3 - 20

pH - 7.3

 

Note the markings on the belly and upper top fin.  I did not draw any lines or marking on the fish to draw attn to the spots, this is "as found".  I did not see any unusual markings on the first dead fish.

 

Thoughts from the BG community would be greatly appreciated..........mh

Share this post


Link to post
Share on other sites

This may not be the issue but once I let my tanks temperature drop suddenly due to loss of lighting. When this happened 24 hour time period a bacteria grew and attacked my fish. I had to treat my tank and lost 50 percent of my fish. Plant material became unusable. Hopefully just lack of feeding or juveniles practicing dominance on smaller fish in the system.

Share this post


Link to post
Share on other sites

I'm no expert nor a vet.  Maybe this link will help until experts arrive.

 

 

http://www.outdoorhub.com/how-to/2014/11/24/recognize-9-common-game-fish-diseases/ 

 

I quit feeding tilapia below 60F as that species is reported to have reduced disease resistance and they will hibernate so to speak.  I remember reading one source that  this is common occurence with pond culture as the bacteria growth rate is  faster than the fish are able acclimate to warmer temperatures and are more susceptible for a few days/weeks.  Of course they were peddling something that was supposed to "naturally" stop disease from forming, so remain skeptical of that as a source.  However, disease resistance being decreased at lower temperatures than the normal for a species has been a current theme in many studies I've read on that matter.

Edited by Ravnis (see edit history)

Share this post


Link to post
Share on other sites

Thanks Ravnis for your suggestions!

 

I looked at some photos of  lymphosarcoma and I don't think this is it.  My BG have a red stamp that is not pronounced or bulbous....almost like a hickey on the fish.

 

Hopefully Cecil or Kellen will see this, they seem to be pretty darn BG-literate !

Share this post


Link to post
Share on other sites

Happy to report that over the last week no addt'l HBG have floated to the top of the fish tank.

 

Not sure that I will ever know what caused them to die.....mh

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now