SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/fish-sick-signs-cdc

Which of these does CDC list as a sign of a sick fish?

Swimming oddly or not eating, plus splotches or swelling.

Start playing free

  1. Eating eagerly at feeding time
  2. Bright, even colors
  3. Swimming oddly or not eating ✔

Why: CDC says a sick fish may swim abnormally, have red, brown or white splotches, not eat, or look swollen. Healthy fish are active with smooth, shiny scales.

Huh, didn't know that: CDC says healthy fish should have intact fins and bodies with no bumps.

The dad joke
What's a fish's favorite TV show? Whale of Fortune.
Like this card?
Play the game

References

Answer: Swimming oddly or not eating. CDC says a sick fish may swim abnormally, have red, brown or white splotches, not eat, or look swollen. Healthy fish are active with smooth, shiny scales.

  1. CDC Healthy Pets: Fish www.cdc.gov/healthy-pets/about/fish.html
    A sick fish may swim abnormally, have red, brown, or white splotches, not eat, or be swollen.
    Checked 2026-10-11.
  2. CDC Healthy Pets: Fish www.cdc.gov/healthy-pets/about/fish.html
    Healthy fish should have smooth, sleek, shiny scales that aren't discolored.
    Checked 2026-10-11.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Fish & AquariumsYour fish hides and holds its fins tight against its body. What does that suggest?Fish & AquariumsOne fish in your tank looks sick. Where does Merck say it can be watched and treated more easily?Fish & AquariumsHow long can a well-cared-for goldfish live?

That's stuff everyone should know.