Is this parasites?

[Sgooosh]

This medaka got a lot thinner and less active, wondering if this is parasites or she just finished laying eggs or something else? The other one is very plump and bright

 

[Colin_T]

Is it still eating well?
What does its poop look like?
How quickly did it lose weight?
How often are you feeding them and what are you feeding them?

 

[Sgooosh]

Is it still eating well?
What does its poop look like?
How quickly did it lose weight?
How often are you feeding them and what are you feeding them?

it isnt eating as well
did not see it poop
I was very busy and not paying much attention to such a small fish, but not extremely quickly
Feeding it a variety of freeze dried protein, flakes

 

[Colin_T]

If it lost weight over a couple of weeks, isn't eating normally, and does/ did a stringy white poop, it probably has an internal protozoan infection. Metronidazole is the medication of choice.

See if you can see its poop. If it's white, see the following link for treatment options. If the poop is normal and coloured, it might have had problems shedding the last lot of eggs. If that is the case, there's not much you can do except feed it up and hope it recovers.

What to do if your fish has Stringy White Poop.

Fish do a stringy white poop for several reasons. 1) Internal Bacterial Infections causes the fish to stop eating, swell up like a balloon, breath heavily at the surface or near a filter outlet, do stringy white poop, and die within 24-48 hours of showing these symptoms. This cannot normally be...

www.fishforums.net

 

[Sgooosh]

If it lost weight over a couple of weeks, isn't eating normally, and does/ did a stringy white poop, it probably has an internal protozoan infection. Metronidazole is the medication of choice.

See if you can see its poop. If it's white, see the following link for treatment options. If the poop is normal and coloured, it might have had problems shedding the last lot of eggs. If that is the case, there's not much you can do except feed it up and hope it recovers.

What to do if your fish has Stringy White Poop.

Fish do a stringy white poop for several reasons. 1) Internal Bacterial Infections causes the fish to stop eating, swell up like a balloon, breath heavily at the surface or near a filter outlet, do stringy white poop, and die within 24-48 hours of showing these symptoms. This cannot normally be...

www.fishforums.net

Thank you. I will use API General cure.