The fishes living deep inside the oceans are different from the aquarium fishes because They have adapted to the intense hypertonicity of the oceans.
What are aquarium fishes?
Aquarium fishes are freshwater fishes. There are many fishes suitable for keeping in the aquarium, some are guppy fish, platy fish, angelfish, goldfish, etc.
Seawater is hypertonic to the fish that resides in it. This means that the salt content of the water is higher than the content inside the fish.
As a result, they lose the water from their body to the surrounding seawater due to osmosis.
Thus, fish living deep beneath the surface of the ocean are rarely or never displayed at seawater aquariums.
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