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Fish keeping, also known as aquarium keeping, refers to the practice of maintaining fish in an artificial environment, typically in an aquarium or pond, for personal enjoyment or study. This hobby encompasses various activities such as selecting, purchasing, acclimating, feeding, and breeding different species of fish, as well as monitoring water quality and providing appropriate habitats to ensure their health and happiness. Fish keeping may involve freshwater or saltwater environments, and can include a wide variety of species, from small tropical fish to large marine creatures such as sharks and rays. Practitioners of this hobby often develop a deep appreciation for the beauty, diversity, and complexity of the aquatic world, and may engage in activities such as water gardening, underwater photography, or environmental conservation efforts related to fish keeping.