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How to Care for Koi Fishes - Exam
Contributed by: Sandhu
  • 1. What is the ideal pH range for a koi pond?
A) 5.0-6.5
B) 9.0-10.0
C) 7.0-8.5
D) 3.0-4.0
  • 2. How often should you perform a partial water change in a koi pond?
A) Never
B) Monthly
C) Annually
D) Weekly or bi-weekly
  • 3. What percentage of the water should be changed during a partial water change?
A) 75%
B) 50%
C) 100%
D) 10-20%
  • 4. What is a common sign of stress in koi?
A) Vibrant colors
B) Active swimming
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 chemical
C) No filtration needed
D) Just mechanical
  • 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) Butterflies
B) Ladybugs
C) Ich
D) Earthworms
  • 8. How deep should a koi pond ideally be?
A) 2 feet
B) 1 foot
C) At least 3 feet
D) 6 inches
  • 9. What should you do before adding new koi to an existing pond?
A) Skip the quarantine step
B) Put in the freezer for 1 hour
C) Add them immediately
D) Quarantine them
  • 10. What is the best way to dechlorinate tap water before adding it to a koi pond?
A) Let it sit for a week
B) Add bleach
C) Use a dechlorinator
D) Boil the water
  • 11. What type of food is generally preferred for koi?
A) Dog food
B) Cat food
C) Floating pellets
D) Sinking pellets
  • 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) Heat the water
B) Add carbon dioxide
C) Add oxygen
D) Control algae and bacteria
  • 14. What is the ideal stocking density for koi?
A) 1 inch of fish per gallon of water
B) 1 inch of fish per 10 gallons of water
C) Unlimited fish per gallon
D) 10 inches of fish per 10 gallons of water
  • 15. What is ammonia?
A) A toxic byproduct of fish waste
B) Oxygen source
C) A beneficial element
D) Koi Food
  • 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) Bleach
B) Ammonia
C) Vinegar
D) Dechlorinator
  • 19. What should be done with uneaten food?
A) Used as fertilizer
B) Stirred in
C) Removed immediately
D) Left to dissolve
  • 20. What is a good depth for plants in a koi pond?
A) As deep as possible
B) Same as water level
C) Varies by plant species
D) Floating only
  • 21. When do koi typically spawn?
A) Spring
B) Summer
C) Autumn
D) Winter
  • 22. What should you do with sick koi?
A) Flush them
B) Feed more
C) Ignore it
D) Quarantine and treat
  • 23. What is an important mineral for koi health and color?
A) Phosphorus
B) Iodine
C) Calcium
D) Sulfur
  • 24. What should you do to prepare koi for winter?
A) Stop feeding entirely in the fall
B) Continue feeding normally
C) Reduce feeding as temperature drops
D) Move them inside
  • 25. What is the importance of aeration in a koi pond?
A) Reduces beneficial bacteria
B) Provides oxygen
C) Removes oxygen
D) Increases ammonia
  • 26. What is the best material for a koi pond liner?
A) EPDM rubber
B) Dirt
C) Plastic sheeting
D) Concrete
  • 27. How can you protect koi from predators like herons?
A) Ignoring the problem
B) Releasing other predators
C) Netting or decoys
D) Loud music
  • 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) Heat the water
B) Filter the water
C) Add oxygen to the pond
D) Remove debris from the pond floor
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