Cold Fish
Cold Fish are healthy fish Buy the book Cold fish are healthy fish. Goldfish and Koi are cold blooded, meaning they have no core body temperature. Their body temperature matches that of their environment. Their ancestors, the Gibel carp swam the icy cold rivers of China. These fish thrive in cold water, and we can use this attribute to our advantage. Reducing tank temperatures is a great way of buying time in a crisis; placing the fish into dormancy. Goldfish begin dormancy at 54f and are fully dormant at 45f. You will still see slow gill and body movement, but they will not eat nor are they very responsive. No, the cold does not hurt a cold blooded animal like it would a warm blood one like us Goldfish and Koi both can tolerate warmer temperatures up to 74f, and sometimes a little higher if conditions are right, but this doesn't mean they should be kept in these temperatures. Their immune systems are compromised in warmer water for more than one reason Bad bacteria flourish in warmer water; beneficial bacteria are weakened. With no internal cooling system, goldfish can and will cook in too high of temperatures. You may see them raise their scales in a futile effort to cool their bodies. Some goldfish have been known to leap out of the water in an effort to escape Water temps goldfish A goldfish is a goldfish no matter what breed or variety. No matter how fancy or how common, your goldfish requires colder water to maintain its good health and longevity. A healthy ecosystem for a goldfish also requires heavily oxygenated water. Some aquarium plants are tropical, and should be placed in tropical tanks with tropical temperatures. Placing these types of plants in a goldfish aquarium invites root rot which invites bad bacteria and adds to the bio load, but some plants, such as algae and duck weed, thrive in very same environment as goldfish, requiring cold and heavily oxygenated water. If a tropical plant is thriving in a goldfish aquarium, the goldfish are not Cold fish Bad bacteria and parasites alike become dormant in cold temperatures, becoming more and more active in warmer temps unless of course the water reaches extreme high temperatures closer to the boiling point which destroys them Goldfish can tolerate extremely low temperatures as long as it remains above the freezing point of 33 degrees Fahrenheit. Goldfish survive extreme winters in ponds only when the pond's bottom is below the freeze line; meaning the point of depth in the grade that doesn't freeze in extreme cold weather Because goldfish are cold blooded they become dormant in lower water temperatures. When a goldfish begins to enter dormancy their blood flow decreases, and so does their need for oxygen or food. The colder your tank or pond water, the slower the fish. The warmer the water, the faster the blood is moving, the more oxygen the fish uses. Toxins or bad bacteria are much more dangerous [...]