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