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Do fish close their eyes when sleeping?

Updated: 8/11/2023
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13y ago

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Not according to my observation. When they sleep, their eyes are still "open" but they do not seem to react to any movement outside the tank. So I think they somehow stop seeing things even with their eyes still "open". I think they are sleeping when they either stop moving and sink to the bottom of the tank, or when they move very little with their fins just to stay afloat. I also noticed that they tend to "raise" their head to a more "upright" position when sleeping. Once I noticed my goldfish did something very cute when she sleeps. She (I presume) hide her head behind a leaf, while resting her body on a small branch of a plant inside the tank.

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13y ago
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12y ago

Fish don't have eyelids, so the eyes never close.

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13y ago
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7y ago

Fish can't Close their eyes since they haven't got any eyelids.

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13y ago

They cannot close their eyes because they have no eyelids

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14y ago

The lack of eyelids prevents this.

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14y ago

no they don't

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12y ago

Yes fish do sleep with there eyes open

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