More on breeding I

A temperature that is excessively high forces the growth of the fish and seriously weakens their constitution. It sometimes overdevelops the finnage too.

All along the line, inferior fish should be removed. For example, with fantails, veiltails and Moors; the ones with only single tails instead of the prized forked tails can be detected well before they are fourteen days old and should be taken out. Later as body shapes develop, the poor quality should be ruthlessly sacrificed. By the time three months have passed, the selection should have been completed.

Within two weeks, the fry are past the infusoria stage and will swallow finely powdered dry foods, dried eggs, oatmeal, etc. Nevertheless, take great care not to foul the water. It should be partly changed especially if snails are not able to cope with the work. After a few more days, micro worms, finely sifted Daphnia and not quite such powdered dry food should be introduced to the fish. Within three to four weeks, the last stage of tubifex and chopped white worms can be fed. By this time, the worst danger is over.

In the meantime, the difficulty is now to get the fish to colour. The scales should be transparent so that a good body colour can be seen through them. Opaque coloured scales would result in a dark, uninteresting fish. However if the parents are from good stock, the required temperature maintained, space is ample, plenty of live foods were constantly given and enough sunlight, the fry should colour within eight months. Some will colour within four months. A constant drip flow of water into the aquarium helps enormously. If a year goes by without the colour showing through, then having a good fish is doubtful. The general conditions, including the surrounding colours and their inter-action with sunlight influence the fry development.

The above descriptions apply to coldwater aquarium fish in general.