Final answer:
The place or tank where fishes are kept is called an aquarium. These tanks are used for both ornamental and research purposes, providing a controlled environment to study the behavior and interactions of aquatic organisms.
Step-by-step explanation:
The place or tank where fishes are kept is known as an aquarium. Aquariums are essential for studying aquatic life and have become increasingly popular since World War II. Fish are contained in these water-filled tanks for various purposes, which can range from ornamental display to scientific research. In laboratories, aquariums can be set up to create controlled environments for experiments, such as observing the behavior of fish and other aquatic organisms. For example, researchers can compare the behavior of species like minnows or sticklebacks in different conditions by placing them in separate containers connected by tubes that circulate water, mimicking a shared environment. This allows scientists to observe interactions and responses to changes in the habitat or the presence of predators, contributing invaluable data to biological studies.