bloated fish

>> Hello
>>
>> We have 2 bream in our pond. One of the bream has bloated up like a
>> balloon and his scales are all sticking out like a pine cone. He/she
>> also points his head down at a 45degree angle and stays in the same
>> place for ages. His/her tail looks a bit raggy too.
>>
>> I was hoping someone might be able to diagnose the problem and
>> suggest a suitable treatment.
>>
>>
>>
>> Other info which might help.
>>
>> The fish are in the bottom pond of a three tier system so oxygen
>> should be OK. There is also a oxygen stone in the bottom pool. We
>> have just given the pond a spring clean and the fish do look livlier
>> and happier.
>>
>> We have the following other fish in the same pool.
>>
>> 3 golden orfe - looking fine.
>> 3 Goldfish - looking fine
>> 1 more bream - looks OK
>> 2 Koi - look like the have a couple of patches of fungus on them
>>
>> Also: 3-4 large frogs which have laid lots of frogs spawn.
>> There are also 4 pots of water lillies and a large clump of irisis.
>>
>> We add water conditioner when we add tap water and somethimes a
>> little pond salt but apart from that don't do much to the pond.
>>
>> The pond has a filtration sytem with a UV lamp which is more than
>> adequate for it's size.
>>
>>
>> Hope someone can help
>>
>> Regards
>>
>>
>> Haymish
>>

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bloated fish - help