It is always interesting to explore and know about the life forms living underwater. Apart from finding the species of aquatic organisms, more interesting is to know their morphology, body parts, and activities, how do they move, what they do round the clock, their behaviour etc. In natural water bodies like river, ponds, lakes and oceans it is not possible to see and know about aquatic life unless we get opportunity to go into them. From outside also, mostly it is difficult to see the aquatic organisms due to color, turbidity, depth and the time to be spent etc.
As an alternative an aquarium may serve as an aquatic system where the captivated aquatic plants and animals stay comfortably under the optimal conditions. In ideal way the aquarium serves as a habitat for them with conditions favourable to live and reproduce and perform lifecycle activities and interactions. In an aquarium one can easily see the aquatic organisms living in different zones of water (Zonation), their body parts, adaptive features, activities, movement patterns, behaviour and life cycle activities etc. One can see the producers, consumers, their interactions and can understand the concepts of food chain, food web, energy transfer, trophic structure, biogeochemical cycles etc that are characteristic features of an ecosystem.
The size of aquarium can be designed from even one cubic feet to several cubic meters or more in variable shapes, according to the available space and ability to manage.
