|Re: Is this too many please ?|
Subject: Re: Is this too many please ?
by Otter on 3/6/2010 10:34:07
The usual rule of thumb for goldfish is 30-50 gallons per adult goldfish. The requirements for a fish go up roughly with the square of length, hence four 5-6" fish roughly equal one full-grown fish, but of course they'll keep growing. I think you're likely to start having problems as your fish grow. And if they continue to reproduce successfully, you're looking at a Malthusian crash.
Besides finding a new home for some of your fish and/or building a bigger pond, you might want to think about adding a predator to eat the eggs and fry. Here in the US, ponders often use sunfish for this purpose, being careful to have only one fish, fish of all one sex, or less fertile hybrids, lest the sunfish themselves overpopulate. I wouldn't recommend these fish outside of their native range, but I'm sure you have something over there that could do the job.