P. magdalenae doesn't eat

  • We are currently upgrading MFK. thanks! -neo
P

pometko_n

Feeder Fish
MFK Member
Jul 11, 2006
22
0
0
Hungary, Budapest
Hi,

I just got a new Potamotrygon magdalenae on this tuesday. Since I acclimatized him he does not accept any food.
I tried:
  • Live tubifex
  • Live shrimp
  • Live earthworm
  • Frozen mysis
  • Frozen prawn

He is quite active, initially he was introduced in to a bare bottomed tank, but yesterday I added some sand.

I don't know if it means anything but, he is like trying to jump at the sides of the aquarium, do you think it's normal?

Does anyone has any idea what could I do to him in order to get him eating?

Thanks.
Pom
 
Can you get red wigglers? Cut them.into inch long sections. I had the same problems and they would not touch earthworms but are the red wigglers

Sent from my LG-P999 using MonsterAquariaNetwork App
 
turn the temp up to 90 make sure you have lots of air in the tank and check ph
 
I literally had this problem and just fixed it. I bought nightcrawlers (earthworms), and garlic guard from my LFS. Soaked the worms in the garlic and fed my rays by hand. THEY COULD NOT RESIST! and these are retics, known to be extremely picky. My backup plan was using a half dosage of Prazipro. Really expensive, although you only dose with half recommended on instructions (because rays are scaleless). That being said, I recommend the first option because it is safe for your biological filter where the other way can cause spikes. I don't recommend changing water heat to 90F as that would only help if there are parasites; otherwise it speed up metabolism and if they arent eating in the first place can kill them quicker (garlic guard also fights parasites). Also I dont recommend changing Ph; you could put them into shock (instant death) besides rays are very resilient to Ph. Your tank should be the same Ph as the tap you get your water. CONSISTENCY IS KEY. Do regular water changes and let me know if there is any progress. It could just be stress from a new environment, and they can snap out of it with a bit of time. Hope this is helpful
 
shark.bait said:
I literally had this problem and just fixed it. I bought nightcrawlers (earthworms), and garlic guard from my LFS. Soaked the worms in the garlic and fed my rays by hand. THEY COULD NOT RESIST! and these are retics, known to be extremely picky. My backup plan was using a half dosage of Prazipro. Really expensive, although you only dose with half recommended on instructions (because rays are scaleless). That being said, I recommend the first option because it is safe for your biological filter where the other way can cause spikes. I don't recommend changing water heat to 90F as that would only help if there are parasites; otherwise it speed up metabolism and if they arent eating in the first place can kill them quicker (garlic guard also fights parasites). Also I dont recommend changing Ph; you could put them into shock (instant death) besides rays are very resilient to Ph. Your tank should be the same Ph as the tap you get your water. CONSISTENCY IS KEY. Do regular water changes and let me know if there is any progress. It could just be stress from a new environment, and they can snap out of it with a bit of time. Hope this is helpful
Click to expand...

By turning the temp up it makes them eat more

I said check the ph not change it as by adding a new ray it may have caused the ph to crash

Or the ph maybe to high for the type of ray mentioned


Sent from my iPhone using MonsterAquariaNetwork app
 
Thank you guys.
After 6 days he is eating. I could not get black worms, krill, clams, or blood worms. Black worms are basicly uknown in hungary.
The temperature is 27.5°C and the PH is 7.5 just like it was in the transport water. I measured ~900PPM for TDS in his transport water, so it was either 50dGH or there was salt added, I guess the later.
So I added some salt in to the water and also added some sand. He is a WC I thouhgh he will feel more confortable that way.
What I found out is that he only eats off the sand, only things that are burrowed into it, especially tubifex.
Yesterday he also ate off a tubifex ball above the sand, but the ones are in the sand are still more prefered.

Here is a short video of him, shot while he was busy with the tubifex ball.

[video=youtube;Ya4JenhUUS0]https://www.youtube.com/watch?v=Ya4JenhUUS0[/video]
 
I wouldnt raise the temperature to 90, that seems too high and I would be worried about stressing the rays more. If you just got the ray and He is eating and is active I would just leave things be for a bit. As shark bait said consistency is key, I wouldnt change anything right away.
 
pometko_n said:
Thank you guys.
After 6 days he is eating. I could not get black worms, krill, clams, or blood worms. Black worms are basicly uknown in hungary.
The temperature is 27.5°C and the PH is 7.5 just like it was in the transport water. I measured ~900PPM for TDS in his transport water, so it was either 50dGH or there was salt added, I guess the later.
So I added some salt in to the water and also added some sand. He is a WC I thouhgh he will feel more confortable that way.
What I found out is that he only eats off the sand, only things that are burrowed into it, especially tubifex.
Yesterday he also ate off a tubifex ball above the sand, but the ones are in the sand are still more prefered.

Here is a short video of him, shot while he was busy with the tubifex ball.

[video=youtube;Ya4JenhUUS0]https://www.youtube.com/watch?v=Ya4JenhUUS0[/video]
Click to expand...

That is a Potamotrygon reticulatus not a magdalenae.

P. magdalenae haven't been rediscovered by science yet, as far as I know.
 
Well, P. reticulatus is not a valid scientific name, it's a synonym for P. orbignyi.
Although he is caught from upper Rio Magdalenae, 3 species live there, none of them is orbigny the other two is very different than this.
I've spent my last 3 weeks with reading stingray related scientific papers. I'm like 90% sure it's magdalenae.
I will post scientific references tomorrow.

I also read some interesting stuff regarding many other species, I'll collect the information at post sometimes later. There is much confusion in the hobby regarding name and localities.
 
You must log in or register to reply here.
MonsterFishKeepers.com
Top Bottom