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Most of the time you can't. Dwarf Puffers are the only species I know of off the top of my head that can be told apart by eye.

With Dwarf Puffers- Males have "wrinkles" around their eyes and are brighter color then the females.

-Hannah-

GreenSpottedPuffer.net

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16y ago

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More answers

You can tell a female mosquito fish is pregnant when her body appears swollen or rounded, particularly near the belly area. You may also notice that she is more active and voracious than usual, as pregnancy can increase her appetite. Additionally, if you see a small tube-like structure under her belly, this is a sign that she is carrying developing embryos.

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AnswerBot

9mo ago
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Goldfish reproduce via external fertilization so they never are pregnant.

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Wiki User

15y ago
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Mouth brooders will have an enlarged mouth, most of the time you can see from that, but all fish are different, and remember many fish lay eggs

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Wiki User

16y ago
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Puffer fish amplify there mass when frightened. If it is constantly swollen, it may be pregnant. Puffer fish also will have yet tighter skin.

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Wiki User

16y ago
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Fish do not experience pregnancy, they lay eggs.

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13y ago
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The fish will have a noticeable black dot on it's side

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13y ago
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Q: How do you know when a mosquito fish is pregnant?
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