Hiya hun
Ok first things first
There are 3 types of colitis...
Acute - sudden onset - and goes away without returning quickly
Chronic - that lasts a long-ish time, over a period of a few weeks
Episodic - bouts of colitis that come and go
Next -
signs of colitis - slimy, mucousy stools (with or without blood), pain or discomfort, the cat is usual subdued in behaviour, diahrhoea (cant spell it lol), reduced apetite, straining to pass stools even when runny.
Causes: Virus, paracites, spoiled food (bin raider?), foreign bodies (eaten toy mouse etc), bacteria (salmonella for example), cancer, pancreatitis, food allergies to name just a few
For your cat its unlikely that fish would cause it, unless he has eaten a big bone that has got stuck - its highly unlikely.
Whats more likely is that he has managed to eat something he shouldnt and this will be a one off.
Now... the thing thats concerning me...
He is a baby persian, and already has a cyst on his kidney.
Was he or his parents PKD DNA tested?
If not i would be having a chat with your vet. PKD (poly-cysting Kidney Disease), is a very serious illness and common in untested lines of persians.
Thankfully good breeders out there are now DNA profiling their cats so only the ones not carrying the disease are bred from
Now with PKD in cats, the cysts are present from birth, which is why i mention it to you - as one has been spotted thats big enough to show up on ultrasound. Cysts can vary in size from 0.5mm - 11cm.
PKD is progressive, the cysts multiply and grow larger as the cat gets older, this disrupts kidney function and can cause full renal failure.
The cysts usually grow slowly, and so dont usualy present any symptoms until the cat is much older (average is around 7yrs old for diagnosis, but can be much older). Sometimes though the cysts grow rapidly resulting in the death of a very young cat
The number of cysts present in each kidney, and the rate at which the cysts grow, varies from cat to cat. Severely affected cats with lots of cysts or cats with rapidly growing cysts will develop renal failure at an early age, and will die from PKD.
Most PKD cats will appear to be quite healthy until well into adulthood but will eventually succumb to renal failure and die from PKD.
Some cats with few cysts or slowly growing cysts may remain healthy into old age, and may die from other conditions before renal failure develops.
So....
This is what i would do in your position....
1) contact the breeder to find out if she tested for PKD, its a simple genetic test and has been widely available for a long time now
2) if not WHY THE HELL NOT!
3) get your cat PKD DNA tested, this is done through your vets, and sending the blood sample to america for testing through optigen.
4) Go back to your breeder if the results are positive... she needs to reimburse you the cost of your kitten and cover any associated future and current vet fees associated with PKD.
5) Report the breeder to whichever cat fancy council and breed club she belongs to - shout it from the rooftops, she has been completely irresponsible. of course this is only IF her cats were not tested, or if your cat is positive.
I am really really sorry to be the one to have had to say all of this. I am a persian owner myself (a lovely little blue and white van), but this is serious and certainly warrents further investigation.
If your cat is positive there is no treatment available currently to halt the progression of PKD but what you can do is make sure that you are using good quality diets (applaws, natures menu, feline feyre etc), and a good supply of water to keep the kidneys flushed and functioning as long as is possible.
These are the outward symptoms of PKD but remember your baby isnt likely to be showing these yet unless his condition is serious.
Weight loss, Depression, Vomiting, excessive urination, excessive thirst, Lethargy, Enlarged kidneys
Tests:
Ultrasound to find cyst - 98% effective if a cyst is found more than likely a positve diagnosis.....
DNA test : can be either blood or even a cotten cheek swab depending on the laboratory doing the testing - talk to your vet.
So sorry he's poorly at the moment , and sorry to bombard you with so much info that might mean not good news.
sal x