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So far mariusvdm has created 26 blog entries.

June 2015

Further selection

At this stage in the season you will have already removed the easily identifiable defective fish from your spawning but there will still be quite a number of fry to look after. The questions are what do you look for and how do you make the choice? The questions are answered by a series of [...]

Indoor aquarium

This week’s topic continues the theme of the more common hobby of keeping Goldfish but this time in the home aquarium. For many years I have kept Goldfish indoors but the challenges of cleaning all the glass, not making a mess when water changing and maintaining a planted aquarium with fish that eat or up [...]


This week I thought I would venture away from the normal subject matters and talk briefly about Goldfish ponds. You might find this surprising but many members don’t have ornamental ponds. They will either have no ponds at all (as their chosen Goldfish varieties are not suited to them) or they will have stock ponds [...]

Colour change

  This week I thought we would get ahead of the game and talk about a change that will happen at some point in the future – the colour change of your Goldfish fry. Starting with the metallic fish, they will develop their olive green colouration as they develop their scales in the first few [...]

May 2015

Changing Fry Foods

  If your Goldfish spawned in mid April then depending on your budget and the development of the fry, you may well be considering ceasing the newly hatched Brine Shrimp in the next few weeks. If you are in that position, the next question is “what should be the next food?” Some of you will [...]

Judges training

Our third meeting of the year is on Saturday 16 May and is the first away from central London. We will be meeting at the village hall in Kempshott, near Basingstoke (please see the events section for full details). This is always a popular meeting as the village hall provides the ideal opportunity to bring [...]


We have talked previously about feeding your Goldfish fry, including the fact that the foods best suited to growing fry are expensive. This week we are going to discuss the implications of these foods for your Goldfish. Newly hatched Goldfish fry are just a few mm long and spend about 36 hours absorbing their yolk [...]

April 2015

Selecting Goldfish Fry

Last week we started feeding the Goldfish fry and very soon they will be growing fast and in need of a first selection. There are several reasons why we need to make a selection. The first is that there will be too many fry to raise if we don’t. Nature causes Goldfish to lay thousands [...]

A Goldfish Breeder’s Blog – North hampshire

      Saturday 4/4/15 The weather has been slowly improving. Day time temperatures in my neck of the woods are 8–12c and night time it is 3–6c. I’ve been feeding my fans on a protein-rich diet of bloodworm and small high protein pellets supplemented with flake food and wheatgerm. The males (5) and [...]


We have previously looked at conditioning the adult Goldfish for spawning, the sorts of media you will need, and the hatching times. As soon as the fry are free swimming that means they have used up their yolk sac and are looking for food. It is essential they are well fed immediately to get them [...]

Water Changes

Last week we discussed filters and I suggested that they are not the only option to maintain water quality. Even if you have effective filtration you will still need to make some water changes, probably weekly, but there are successful solutions that are not based on filtration. It is perfectly possible to maintain your Goldfish [...]


This week I thought I would move on to maintaining the Goldfish and so let’s discuss the surprisingly controversial issue of filters. We know the nitrogen cycle means that our Goldfish when fed produce ammonia and that it is poisonous. We know that in a biological filter the ammonia will be converted to nitrite, but [...]