Aquarium keeping involves the study of fish behavior. The communication in fish is done by movement, positioning, and interaction with other fish in the tank. The knowledge of such behaviors assists the owners of the aquarium to ascertain that their fish is healthy and comfortable.
Schools or shoals of many fish species are a natural phenomenon. Fishing fish like tetra or danios would feel secure when they are in a crowd of other fish. Holding them in groups will ease off stressful situations and promote natural behavior.
It is also characteristic of some fish species to behave in a territorial way. Certain fish can assert their territories on a given portion of the aquarium and protect it against other fish. Decorations, plants and hiding places should be offered to minimize the conflicts among the territorial fish.
Different patterns of activity are also evident in fish with respect to species. Certain fishes are daytime active with others being nighttime active. These patterns allow the owners of aquariums to know the natural cycles of their fish.
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Alterations in fish behavior may at times signify ill health or unhealthy water environments. As an illustration, fish in constant hiding, irregularly swimming, or gasping at the water surface could be either stressed or lacking oxygen.
The important behavioral patterns can also be noted during feeding time. Healthy fish tend to react fast to food and themeatic feeding. Reducing or lazy eating can be a sign of disease or environmental issues.

