Not to sure what type of parasite my fish have here but there showing sunken in bellies and their anus is slightly protruding, they have been like this for awhile as i just can't figure out what they have. I did have 3 angel pairs but i lost one of my male angels after it paired up and spawned while there was another angel pair in the tank, the stress must have caused the parasite to take hold, he began to spit out his food then dyed with bloated stomach. There poo is sometimes stringing, in segments and light coloured. most of the time food colour and normal, however i did buy some NLS anti parasitic garlic pellets, but only one of my angel pairs eat them, the pair that does eat them i feed them exclusively on the pellet for ages and there bellies did not improve. The angels have been spawning in this condition and i do lose some of the fry with bloated stomachs. Have never seen a worm protruding from my fish besides my guppies which i believe i have somehow managed to pass what my angels have into my guppy tank as some of the males have long white worm like things that appear attached to there gonopodium, as i have seen a male stretching his gonopodium forward and the worm followed, plus a few of the males have become skinny. I treated the guppies in the pic with Praziquantel, did not affect the "worm". I treated some young angels from one of my pairs with Levamisole in a bare bottom tank and didn't notice any worms on the bottom. When i culled some of these young angels for deformed fins, i put them in the freezer and when i pulled them out they all had real big red/white worms that came out of there gills area. Im at a loss of what to do, i have 5 tanks biggest being 400L, not keen to unnecessarily treat all the tanks with all the different types of wormers. Ill attach some pics of the symptoms and hopefully someone can help, i have a angel pair that are raising around 100 fry and im gonna need this problem solved for their sake! I have spent many many hours researching with no luck.
I did find this online about Nematode that sound about right but treatment is difficult and cant find any of the treatments.
The threadworms infect the entire body of infected fish but the only visible sign of the infection will be worms hanging out of the anus of the infected fish. Severe cases can cause the belly of the fish to sink in but most cases don't cause any external signs other then the anal worms and usually don't cause any real problems for the fish. It should be treated none the less. Nematodes are hard to treat but there are a couple of methods that might or might not be successful. One is to treat the fish using parachlorometaxylenol. The second method to treat nematodes is to feed you fish medicated fish food containing thiabendazole.
First pair:
Female, photo taking just befor she spawned thats why she looks bloated and nips in fins are from her partner ( they went through a rough patch lol )
Male
http://s1357.photobucket.com/user/Espi_ ... b.jpg.html
Second Pair: ( eating NLS Garlic pellets ) and raising fry excuse my crappy crack fix
Female
http://s1357.photobucket.com/user/Espi_ ... e.jpg.html
Male
http://s1357.photobucket.com/user/Espi_ ... 1.jpg.html
Guppy
http://s1357.photobucket.com/user/Espi_ ... 2.jpg.html