Temperatures around 75 oF (24 oC) can be used for hatching the eggs and maintained for as long as maximum growth rates are required. The water temperature for fry and younger fish can be higher than for adults. Goldfish need high oxygen levels to enable them to process the large amounts of food needed to grow quickly. Goldfish need 24 square inches of surface area per inch of fish, or a filtration/aeration system. What actually happens is the build up of growth inhibiting hormones stop the fish, and any other Goldfish in the same container, from growing any bigger. This is why there is the widely held belief that Goldfish only grow to the size of their container. This is especially important for fry when large numbers are often kept in crowded conditions for the first few weeks.Īnother equally important reason for water changes is Goldfish produce hormones that inhibit growth. Goldfish can tolerate many different water conditions, hard, soft, acid or alkaline, but they won't tolerate water with ammonia in it or low oxygen levels caused by pollution.įrequent water changes are required for goldfish. Goldfish kept in a crowded aquarium or bowl and only fed dry prepared foods will not thrive.įive factors determine how fast a goldfish grows: 1.
Goldfish growth rates are totally dependent on the conditions they are kept in, and the amount of high quality food they receive. Goldfish growth rates can be massive for their first few weeks after hatching in a perfect growing environment, as much as a 50% or more increase in body length in a week. Goldfish will not thrive in a crowded aquarium.
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