ThatQuiz Test Library Take this test now
How to Care for Koi Fishes
Contributed by: Sandhu
  • 1. What is the ideal pH range for a koi pond?
A) 5.0-6.5
B) 7.0-8.5
C) 9.0-10.0
D) 3.0-4.0
  • 2. How often should you perform a partial water change in a koi pond?
A) Never
B) Weekly or bi-weekly
C) Annually
D) Monthly
  • 3. What percentage of the water should be changed during a partial water change?
A) 10-20%
B) 100%
C) 75%
D) 50%
  • 4. What is a common sign of stress in koi?
A) Active swimming
B) Vibrant colors
C) Aggressive feeding
D) Clamped fins
  • 5. What is the best type of filtration for a koi pond?
A) Combination of mechanical and biological
B) Just mechanical
C) Just chemical
D) No filtration needed
  • 6. What temperature range is generally optimal for koi health?
A) 30-40°F (-1-4°C)
B) 40-50°F (4-10°C)
C) 65-75°F (18-24°C)
D) 85-95°F (29-35°C)
  • 7. What is a common parasite that affects koi?
A) Earthworms
B) Butterflies
C) Ladybugs
D) Ich
  • 8. How deep should a koi pond ideally be?
A) 6 inches
B) 1 foot
C) 2 feet
D) At least 3 feet
  • 9. What should you do before adding new koi to an existing pond?
A) Put in the freezer for 1 hour
B) Quarantine them
C) Add them immediately
D) Skip the quarantine step
  • 10. What is the best way to dechlorinate tap water before adding it to a koi pond?
A) Boil the water
B) Let it sit for a week
C) Use a dechlorinator
D) Add bleach
  • 11. What type of food is generally preferred for koi?
A) Floating pellets
B) Sinking pellets
C) Cat food
D) Dog food
  • 12. How often should you feed koi?
A) Never
B) Several times a day in small amounts
C) Once a week
D) Once a day in large amounts
  • 13. What is the purpose of a UV sterilizer in a koi pond?
A) Add carbon dioxide
B) Heat the water
C) Add oxygen
D) Control algae and bacteria
  • 14. What is the ideal stocking density for koi?
A) Unlimited fish per gallon
B) 1 inch of fish per 10 gallons of water
C) 10 inches of fish per 10 gallons of water
D) 1 inch of fish per gallon of water
  • 15. What is ammonia?
A) Oxygen source
B) A toxic byproduct of fish waste
C) Koi Food
D) A beneficial element
  • 16. What converts ammonia to nitrite?
A) Harmful algae
B) Beneficial bacteria
C) Chemicals
D) Fish waste
  • 17. What do plants in the pond absorb?
A) Nitrates
B) Ammonia
C) Nitrites
D) Phosphates
  • 18. What can you use to remove chlorine from the pond?
A) Ammonia
B) Bleach
C) Dechlorinator
D) Vinegar
  • 19. What should be done with uneaten food?
A) Used as fertilizer
B) Removed immediately
C) Left to dissolve
D) Stirred in
  • 20. What is a good depth for plants in a koi pond?
A) Same as water level
B) As deep as possible
C) Varies by plant species
D) Floating only
  • 21. When do koi typically spawn?
A) Summer
B) Winter
C) Spring
D) Autumn
  • 22. What should you do with sick koi?
A) Quarantine and treat
B) Flush them
C) Ignore it
D) Feed more
  • 23. What is an important mineral for koi health and color?
A) Iodine
B) Phosphorus
C) Calcium
D) Sulfur
  • 24. What should you do to prepare koi for winter?
A) Stop feeding entirely in the fall
B) Move them inside
C) Continue feeding normally
D) Reduce feeding as temperature drops
  • 25. What is the importance of aeration in a koi pond?
A) Reduces beneficial bacteria
B) Removes oxygen
C) Increases ammonia
D) Provides oxygen
  • 26. What is the best material for a koi pond liner?
A) Concrete
B) EPDM rubber
C) Dirt
D) Plastic sheeting
  • 27. How can you protect koi from predators like herons?
A) Ignoring the problem
B) Netting or decoys
C) Loud music
D) Releasing other predators
  • 28. What is the term for the white, red, and black koi?
A) Ogon
B) Showa
C) Kohaku
D) Asagi
  • 29. What is the role of a pond vacuum?
A) Filter the water
B) Remove debris from the pond floor
C) Heat the water
D) Add oxygen to the pond
Created with That Quiz — a math test site for students of all grade levels.