07-15-2009, 08:19 PM
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I have 10 goldfish myself, all doubletails marking my comeback since keeping singletails and several doubletails previously. Goldfish do not have stomach which is why they tend to poo heavily. Their GI tract connects from the gall bladder straight to the intestines. The only reason why a lot of fancy goldies suffer buoyancy issues is they are fed with the commercial food trash that contain a lot of starch in it including gluten meal, yeast, etc. Despite lack of enzymes to digest the food, they have bacteria lining in their GI tract that digest the starch but in return, produce gas. The gas produced, is the one that gets trapped in the GI tract and causes the fish to lose its swimming balance. This is corrected by incorporating acidophilus in the food recipe or make gel foods. Mazuri gel foods help a lot in this case and have the proper nutrition needed by the fish.
Twistermom is correct. What a lot of people are missing is enough space, filtration, maintenance and proper diet. Just because goldfish are hardy, it doesn't mean they can be used for cycling purposes, fishbowls and any other types of torturing environment. They can suffer badly like most other fish and are actually very prone to red streaks appearing on their fins and black smudges, both of which indicate ammonia and nitrite poisoning.
I might add that goldfish are very poor choice for feeders as these contain high levels of thiaminase. The thiaminase is responsible for blocking entry of necessary nutrients needed by the fish. This leads to high incidence of malnutrition on fish.