An aquarium transparent png download (plural aquariums or aquaria) is a vivarium, usually contained in a clear-sided container (typically constructed of glass or high-strength plastic) in which water-dwelling plants and animals (usually fish, but also invertebrates, amphibians, marine mammals, and reptiles) are kept in captivity, often for public display; or it is an establishment that features such displays. With over 60 million aficionados worldwide, aquarium keeping is a popular pastime.
Since the 1850s, when the forerunner of today’s aquarium was initially established as a novelty, the number of aquarists has grown as more complex systems, such as lighting and filtration systems, have been developed to keep aquarium fish healthy. The Osaka Aquarium, for example, has a tank of 5,400 m3 (1.4 million US gallons) with a collection of about 580 species of aquatic life, while the projected National institute for research into aquatic ecosystems in England would be the world’s largest aquarium at 40 hectares.
Hobbyists today keep a wide range of aquaria, from basic bowls with a single fish to elaborate simulated ecosystems with meticulously constructed support systems. Fresh water, salt water, and brackish water, at tropical or cold water temperatures, are the most common types of aquaria. These and other variables govern the types of fish and other aquarium residents that can survive and thrive. Although an increasing number of creatures are bred in captivity for supply to the aquarium commerce, most inhabitants for aquaria are acquired from the wild.
The conscientious aquarist makes a concerted effort to maintain a tank ecology that closely resembles the natural habitat of its inhabitants. Managing the entrance and outflow of nutrients, as well as the waste produced by tank residents, are all part of maintaining water quality. The nitrogen cycle depicts the transfer of nitrogen from food to hazardous nitrogenous waste produced by tank residents, through metabolism by helpful bacteria populations to less dangerous chemicals. Appropriate species selection, biological loading control, and proper physical design are all important aspects of maintaining a suitable aquarium habitat. If these criteria are not met, fish illnesses may develop.