In general, this is a hardy and robust fish with lots of character.

They are a hardy fish, and can survive in water that is not very well oxygenated.

They are extremely hardy fish and can live nearly ten years.

It is however a hardy fish for those who can provide it with a proper environment.

They are, however, very hardy fish who will fight right until you slip your landing net under them.

They are hardy fish that can survive environmental changes and have a good tolerance to high acidity in water.

Leave for a few days, then add just one or two hardy fish.

A hardier fish, the brown can stand warmer water and more pollutants.

They are very hardy fish that can live in poor quality water.

Her husband added, "These are obviously very hardy fish."