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Breeding Aquarium Fish - Marbles

Most egg scatterers are also avid egg eatersThe best way to spawn egg scatterers?

Many species of fish scatter their eggs over an area, particularly at sunrise. They then gobble up all they can find. This behaviour is typical of Characins, Barbs, and Danios, but also many other species. The basis of the marble method is to prevent the predation of the eggs after spawning by making them inaccessible to the hungry adults.
A pair or spawning group should be selected and placed in a seperate spawning tank over the marbles in the evening, and then removed the following morning. The fish should not be fed during this time, as uneaten food will also fall between the marbles and foul the tank water. Once the adults are removed, the marbles can also be removed and the eggs collected, or they can simply be left in place until they hatch, and the fry are free swimming. This is a very easy and effective method of spawning egg scattering species, and one used widely in laboratories in studies of fish such as the Zebra Danio Brachydanio rerio.








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Fishkeeping Facts and Tips

Should I get rid of snails? Snails in the aquarium can be very useful. Many fishkeepers tend to overfeed a little, and this extra food sinks to the bottom and decays, polluting the aquarium water. Snails will happily come and eat up the left overs though - if you have an outbreak of snails you are most likely overfeeding your fish! If you really do want to remove snails, fish like the clown loach, and several puffers will eat them - but do make sure they are compatible with the other fish in your tank


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