Freshwater predatory fish tank

In many aquariums freshwater shrimp can be welcome additions, enhancing the overall environment and helping to keep it clean. There are however a number a different shrimp species to consider, particularly if they are to live as part of a wide aquatic community. Shrimp generally range in size from 1 inch to 4 inches, depending upon the species and in general it is not advisable to keep them with aggressive, predatory fish.

Keeping Shrimps

Popular species of shrimp include amano, cherry red and ghost (or grass) shrimps. These are all relatively hardy, can live in a range of water conditions and temperatures and are generally a good choice if you have never kept shrimp before.

The benefits of keeping shrimp:

  • Predominantly scavengers, some species of shrimp can help you to keep the algae levels down.
  • Shrimp will mop up any uneaten food, dead fish and other detritus as they scavenge for food.
  • Because they scavenge much of the waste they can help to keep levels of ammonia and nitrate low.
  • Because of their size and scavenging nature it is possible to add numerous shrimp without upsetting the habitat drastically.
  • Whilst they do breed, in a community tank any larvae are typically mopped up fairly quickly by the fish. Unlike snails which seem to just breed and breed.
  • They’re entertaining; the way they move, eat and bounce around your aquarium can even make them a major point of interest.

Like many different animals with an exoskeleton shrimps will actually moult their shells from time to time as this allows them to grow as their shells become too small. This is normal and nothing to worry about but it is worth bearing in mind that straight after moulting, they are highly vulnerable due to the fact that their shell has not yet hardened. As such you may need to provide them with somewhere to hide during this vulnerable stage as they could be eaten by the fish.

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A case against punctuated equilibrium

2008-10-01 20:36:59 by HispanicMan

LONDON (Reuters) - Some colorful cichlid fish in Africa's Lake Victoria formed a new species by adapting their vision, showing that geographical isolation is not essential for divergence.
The fish evolved to improve their ability to see food and predators at different depths, and this also affected the way they saw colors and attracted mates, said Ole Seehausen, who led the study published in the journal Nature.
"The split of one species into two was initiated by adaptation of the sensory system, in this case the eyes, to the local environment," said Seehausen

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