Question

in an aquarium why do fishes open and close their mouth at regular intervals?

Answer 1

Fishes open mouth to take water like we humans do but they don't take water to quench their thirst. If not to quench their thirst,then why do they take? To respire. Yes to respire. Water contains dissolved oxygen. Water from the mouth goes to the gills where dissolved oxygen is absorbed and water is flushed out.

Answer 2

In an aquarium fishes open and close their mouth at regular intervals because:-

• Fishes gulp water by opening their mouth and when they close them the water moves out from the operculum which coats the gill. This is done by them to facilitate the breathing process, as the dissolved oxygen in water gets absorbed by blood capillaries which are present in gills and canon dioxide is given out.

• Fishes take in water along with the dissolved oxygen and close their mouth at regular intervals to push the dissolved water to the gills and the dissolved oxygen is separated from it and supplied to the body.

• The gills of fish are covered with bony lid and fishes takes in water by closing the lid of their gills and opening its mouth as the fish closes its mouth the water is supplied to the gills. The gills comprise filaments that have lamellae that increase the surface area of the gills for extracting more oxygen from water. In this manner fish open and closes their mouth at regular interval for respiration.

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