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Parasite


Steve Walker

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Looks like an encysted nematode (roundworm) under the skin to me - the body may be a little distended too, suggesting that they may be in the body cavity. I've seen nematodes in fish before, but I've never seen exactly this - anyone else?

 

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Nope not seen anything quite like that yet. Do you think the bit sticking out of the operculum is part of the same critter in the dorsal fin area? Have you done an autopsy yet? I'd have it out of the tank if I were you Steve, just in case it's catching. The body does look a bit bloated, I'll bet there are hundreds of them in there.

 

When I was about 9 years old I saw a strange looking salmon parr in a local stream. I fished it out (with my hands) and it had a huge pot belly. I slit it open to see what was wrong with it and it had a tapeworm about 6 foot long inside it. The fish was less than 4".

 

I hate, but at the same time I am fascinated by parasites. The life cycles of some of them are so wonderfully bizarre.

The problem isn't what people don't know, it's what they know that just ain't so.
Vaut mieux ne rien dire et passer pour un con que de parler et prouver que t'en est un!
Mi, ch’fais toudis à m’mote

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  • 1 month later...

Sorry, not come across that one before.

Stephen

 

Species Caught 2014

Zander, Pike, Bream, Roach, Tench, Perch, Rudd, Common Carp, Mirror Carp, Eel, Grayling, Brown Trout, Rainbow Trout

Species Caught 2013

Pike, Zander, Bream, Roach, Eel, Tench, Rudd, Perch, Common Carp, Koi Carp, Brown Goldfish, Grayling, Brown Trout, Chub, Roosterfish, Dorado, Black Grouper, Barracuda, Mangrove Snapper, Mutton Snapper, Jack Crevalle, Tarpon, Red Snapper

Species Caught 2012
Zander, Pike, Perch, Chub, Ruff, Gudgeon, Dace, Minnow, Wels Catfish, Common Carp, Mirror Carp, Ghost Carp, Roach, Bream, Eel, Rudd, Tench, Arapaima, Mekong Catfish, Sawai Catfish, Marbled Tiger Catfish, Amazon Redtail Catfish, Thai Redtail Catfish, Batrachian Walking Catfish, Siamese Carp, Rohu, Julliens Golden Prize Carp, Giant Gourami, Java Barb, Red Tailed Tin Foil Barb, Nile Tilapia, Black Pacu, Red Bellied Pacu, Alligator Gar
Species Caught 2011
Zander, Tench, Bream, Chub, Barbel, Roach, Rudd, Grayling, Brown Trout, Salmon Parr, Minnow, Pike, Eel, Common Carp, Mirror Carp, Ghost Carp, Koi Carp, Crucian Carp, F1 Carp, Blue Orfe, Ide, Goldfish, Brown Goldfish, Comet Goldfish, Golden Tench, Golden Rudd, Perch, Gudgeon, Ruff, Bleak, Dace, Sergeant Major, French Grunt, Yellow Tail Snapper, Tom Tate Grunt, Clown Wrasse, Slippery Dick Wrasse, Doctor Fish, Graysby, Dusky Squirrel Fish, Longspine Squirrel Fish, Stripped Croaker, Leather Jack, Emerald Parrot Fish, Red Tail Parrot Fish, White Grunt, Bone Fish
Species Caught 2010
Zander, Pike, Perch, Eel, Tench, Bream, Roach, Rudd, Mirror Carp, Common Carp, Crucian Carp, Siamese Carp, Asian Redtail Catfish, Sawai Catfish, Rohu, Amazon Redtail Catfish, Pacu, Long Tom, Moon Wrasse, Sergeant Major, Green Damsel, Tomtate Grunt, Sea Chub, Yellowtail Surgeon, Black Damsel, Blue Dot Grouper, Checkered Sea Perch, Java Rabbitfish, One Spot Snapper, Snubnose Rudderfish
Species Caught 2009
Barramundi, Spotted Sorubim Catfish, Wallago Leeri Catfish, Wallago Attu Catfish, Amazon Redtail Catfish, Mrigul, Siamese Carp, Java Barb, Tarpon, Wahoo, Barracuda, Skipjack Tuna, Bonito, Yellow Eye Rockfish, Red Snapper, Mangrove Snapper, Black Fin Snapper, Dog Snapper, Yellow Tail Snapper, Marble Grouper, Black Fin Tuna, Spanish Mackerel, Mutton Snapper, Redhind Grouper, Saddle Grouper, Schoolmaster, Coral Trout, Bar Jack, Pike, Zander, Perch, Tench, Bream, Roach, Rudd, Common Carp, Golden Tench, Wels Catfish
Species Caught 2008
Dorado, Wahoo, Barracuda, Bonito, Black Fin Tuna, Long Tom, Sergeant Major, Red Snapper, Black Damsel, Queen Trigga Fish, Red Grouper, Redhind Grouper, Rainbow Wrasse, Grey Trigger Fish, Ehrenbergs Snapper, Malabar Grouper, Lunar Fusiler, Two Tone Wrasse, Starry Dragonet, Convict Surgeonfish, Moonbeam Dwarf Angelfish,Bridled Monocle Bream, Redlined Triggerfish, Cero Mackeral, Rainbow Runner
Species Caught 2007
Arapaima, Alligator Gar, Mekong Catfish, Spotted Sorubim Catfish, Pacu, Siamese Carp, Barracuda, Black Fin Tuna, Queen Trigger Fish, Red Snapper, Yellow Tail Snapper, Honeycomb Grouper, Red Grouper, Schoolmaster, Cubera Snapper, Black Grouper, Albacore, Ballyhoo, Coney, Yellowfin Goatfish, Lattice Spinecheek

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Update on this - I never did find out what the hell it was. The only other case I could find on the internet was in a wild caught angelfish. In the end, four fish showed symptoms and were culled. The fish in the photograph was dissected and found to be absolutely bloated with what appear to be encysted parasites. All preserved in alcohol, keep meaning to send them through to Dr Burgess at Plymouth University to see if he's interested.

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Sounds like a real nasty little critta. Hopefully that will be the last you see of them.

 

But if you get any more info, it would be interesting to know about it.

Stephen

 

Species Caught 2014

Zander, Pike, Bream, Roach, Tench, Perch, Rudd, Common Carp, Mirror Carp, Eel, Grayling, Brown Trout, Rainbow Trout

Species Caught 2013

Pike, Zander, Bream, Roach, Eel, Tench, Rudd, Perch, Common Carp, Koi Carp, Brown Goldfish, Grayling, Brown Trout, Chub, Roosterfish, Dorado, Black Grouper, Barracuda, Mangrove Snapper, Mutton Snapper, Jack Crevalle, Tarpon, Red Snapper

Species Caught 2012
Zander, Pike, Perch, Chub, Ruff, Gudgeon, Dace, Minnow, Wels Catfish, Common Carp, Mirror Carp, Ghost Carp, Roach, Bream, Eel, Rudd, Tench, Arapaima, Mekong Catfish, Sawai Catfish, Marbled Tiger Catfish, Amazon Redtail Catfish, Thai Redtail Catfish, Batrachian Walking Catfish, Siamese Carp, Rohu, Julliens Golden Prize Carp, Giant Gourami, Java Barb, Red Tailed Tin Foil Barb, Nile Tilapia, Black Pacu, Red Bellied Pacu, Alligator Gar
Species Caught 2011
Zander, Tench, Bream, Chub, Barbel, Roach, Rudd, Grayling, Brown Trout, Salmon Parr, Minnow, Pike, Eel, Common Carp, Mirror Carp, Ghost Carp, Koi Carp, Crucian Carp, F1 Carp, Blue Orfe, Ide, Goldfish, Brown Goldfish, Comet Goldfish, Golden Tench, Golden Rudd, Perch, Gudgeon, Ruff, Bleak, Dace, Sergeant Major, French Grunt, Yellow Tail Snapper, Tom Tate Grunt, Clown Wrasse, Slippery Dick Wrasse, Doctor Fish, Graysby, Dusky Squirrel Fish, Longspine Squirrel Fish, Stripped Croaker, Leather Jack, Emerald Parrot Fish, Red Tail Parrot Fish, White Grunt, Bone Fish
Species Caught 2010
Zander, Pike, Perch, Eel, Tench, Bream, Roach, Rudd, Mirror Carp, Common Carp, Crucian Carp, Siamese Carp, Asian Redtail Catfish, Sawai Catfish, Rohu, Amazon Redtail Catfish, Pacu, Long Tom, Moon Wrasse, Sergeant Major, Green Damsel, Tomtate Grunt, Sea Chub, Yellowtail Surgeon, Black Damsel, Blue Dot Grouper, Checkered Sea Perch, Java Rabbitfish, One Spot Snapper, Snubnose Rudderfish
Species Caught 2009
Barramundi, Spotted Sorubim Catfish, Wallago Leeri Catfish, Wallago Attu Catfish, Amazon Redtail Catfish, Mrigul, Siamese Carp, Java Barb, Tarpon, Wahoo, Barracuda, Skipjack Tuna, Bonito, Yellow Eye Rockfish, Red Snapper, Mangrove Snapper, Black Fin Snapper, Dog Snapper, Yellow Tail Snapper, Marble Grouper, Black Fin Tuna, Spanish Mackerel, Mutton Snapper, Redhind Grouper, Saddle Grouper, Schoolmaster, Coral Trout, Bar Jack, Pike, Zander, Perch, Tench, Bream, Roach, Rudd, Common Carp, Golden Tench, Wels Catfish
Species Caught 2008
Dorado, Wahoo, Barracuda, Bonito, Black Fin Tuna, Long Tom, Sergeant Major, Red Snapper, Black Damsel, Queen Trigga Fish, Red Grouper, Redhind Grouper, Rainbow Wrasse, Grey Trigger Fish, Ehrenbergs Snapper, Malabar Grouper, Lunar Fusiler, Two Tone Wrasse, Starry Dragonet, Convict Surgeonfish, Moonbeam Dwarf Angelfish,Bridled Monocle Bream, Redlined Triggerfish, Cero Mackeral, Rainbow Runner
Species Caught 2007
Arapaima, Alligator Gar, Mekong Catfish, Spotted Sorubim Catfish, Pacu, Siamese Carp, Barracuda, Black Fin Tuna, Queen Trigger Fish, Red Snapper, Yellow Tail Snapper, Honeycomb Grouper, Red Grouper, Schoolmaster, Cubera Snapper, Black Grouper, Albacore, Ballyhoo, Coney, Yellowfin Goatfish, Lattice Spinecheek

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Because they only ever affected a small number of cardinals, and showed no evidence of spread between fish in the tank, I now suspect that the fish were infected with the parasite before I got them (many cardinals are still wild caught). Typically parasites like this need multiple hosts, and typically the next host in the cycle for something like this would be a bird or mammal - so hopefully the cycle is broken and I won't be seeing any more cases.

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