Fish habitat can refer to a variety of different environments, including aquariums, rivers, and lakes. An AQUARIUM is an artificial environment, usually made of glass or acrylic, that is filled with water and contains fish and other aquatic life. Rivers are natural bodies of water that flow from higher to lower elevations, often connecting two larger bodies of water. Lakes are also natural bodies of water, but they are typically larger and more enclosed than rivers. All three of these habitats provide a home for fish and other aquatic life.