Dead fish - Diagnosis help please

tapeworm

Member
A wolf eel that looked very healthy. A few days ago, he slowed down on his eating. I also noticed heavier breathing in the last few days.
My numbers were ok, Nitrates under 15. I did a few water changes to get them down even more.
Today, I found him dead. He had a huge blue/green stain around his stomach.
I took him out of the tank, cut his stomach open and a bunch of blue liquid came out, beyond a normal fish. He/she was also had eggs.
Could that be internal bleeding? All my other fish look fine.
I have not used any chemicals or medications.
Any ideas?
 
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