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How to Identify and Classify Discus Fishes - Exam
Contributed by: Wallis
  • 1. What is the scientific name for Discus fish?
A) Symphysodon
B) Betta
C) Poecilia
D) Pterophyllum
  • 2. What is the defining characteristic of a Discus's body shape?
A) Laterally compressed and round
B) Dorsally flattened
C) Elongated and cylindrical
D) Square and box-like
  • 3. How many vertical bars do wild-type Discus typically display?
A) Nine
B) Eleven
C) Seven
D) Five
  • 4. Which species is considered the 'Heckel' Discus?
A) Symphysodon tarzoo
B) Symphysodon discus
C) Symphysodon heckel
D) Symphysodon aequifasciatus
  • 5. Which species is often referred to as the 'Blue' or 'Brown' Discus?
A) Symphysodon discus
B) Symphysodon tarzoo
C) Symphysodon heckel
D) Symphysodon aequifasciatus
  • 6. What is the 'Pigeon Blood' Discus known for?
A) Bright green fins
B) Pepper-like speckling
C) Intense red stripes
D) Solid blue color
  • 7. Which color variation is associated with the 'Red Melon' Discus?
A) Yellow and green markings
B) Blue and black stripes
C) White with black spots
D) Solid red or orange body
  • 8. What is a key indicator of a healthy Discus?
A) Fin clamping and hiding
B) Bright eyes and alert behavior
C) Cloudy eyes and lethargy
D) Rapid breathing at the surface
  • 9. What fin is the most important to examine to confirm a Discus species and morph?
A) Caudal Fin
B) Anal Fin
C) Pectoral Fin
D) Dorsal fin
  • 10. What does 'F1' mean when describing Discus?
A) Fish with one fin
B) First generation offspring of wild-caught parents
C) Fully grown, type 1
D) Fish food grade 1
  • 11. What is generally the best pH range for keeping Discus?
A) 6.0-7.0
B) 8.5-9.5
C) 5.0-6.0
D) 7.5-8.5
  • 12. What temperature range is ideal for Discus?
A) 82-88°F (28-31°C)
B) 68-72°F (20-22°C)
C) 72-78°F (22-26°C)
D) 90-94°F (32-34°C)
  • 13. What is a common sign of stress in Discus fish?
A) Vibrant color enhancement
B) Aggressive behavior
C) Increased appetite
D) Darkening of color
  • 14. Which food type is essential for Discus health and color?
A) Low-protein foods
B) Algae wafers
C) Plant-based flakes
D) High-protein foods
  • 15. What type of water change is generally recommended for Discus?
A) No water changes required
B) Frequent, small water changes
C) Daily, complete water changes
D) Infrequent, large water changes
  • 16. What does 'Turquoise' often refer to in Discus?
A) Yellow bodies
B) Blue striations
C) Green fins
D) Red patches
  • 17. What anatomical difference helps distinguish *S. heckel* from other *Symphysodon*?
A) Lack of bars
B) Smaller eyes
C) Larger fins
D) Prominent middle bar
  • 18. What is the typical social behavior of Discus?
A) They are solitary fish
B) They are nocturnal
C) They are highly territorial
D) They are schooling fish
  • 19. What is the function of the slime coat on a Discus?
A) Attracts mates
B) Helps with buoyancy
C) Aids in digestion
D) Protects against parasites and infections
  • 20. What is a 'Checkerboard' Discus?
A) A Discus that only eats flake food
B) A Discus with only red fins
C) A Discus with damaged scales
D) Discus with a pattern resembling a checkerboard
  • 21. Which of these is NOT a common Discus disease?
A) Ichthyophthirius multifiliis (Ich)
B) Swim Bladder Disorder
C) Gill Flukes
D) Hexamita (Hole in the Head)
  • 22. What is the primary way Discus parents feed their fry?
A) Regurgitate food
B) Secrete slime from their bodies
C) Lay eggs for the fry to eat
D) Hunt for small invertebrates
  • 23. What do the eyes of an unhappy or unwell discus look like?
A) Black and shrunken
B) Cloudy and recessed
C) Bright and Active
D) Red and swollen
  • 24. Why is driftwood or peat often used in Discus tanks?
A) To raise the pH and add minerals
B) To oxygenate the water
C) To lower the pH and add tannins
D) To provide hiding places
  • 25. What is a potential danger of keeping Discus with other fish?
A) Improved water quality
B) Reduced aggression
C) Transmission of diseases
D) Increased oxygen levels
  • 26. What is 'peppering' referring to on Discus?
A) Small black dots/speckles
B) Large red spots
C) Parasites on the scales
D) Fungal infections
  • 27. The 'Leopard' Discus typically displays which pattern?
A) Vertical stripes only
B) Spots and patterns resembling a leopard
C) Scaleless body
D) Solid dark color
  • 28. How do you differentiate male and female Discus fish externally?
A) Males are larger
B) Males have longer fins
C) Difficult to distinguish externally
D) Females have brighter colors
  • 29. What is the importance of water hardness (GH) for Discus?
A) Soft water is preferred
B) Extremely hard water is needed
C) Hard water is preferred
D) Water hardness is not important
  • 30. What type of filtration is most important for a Discus tank?
A) Biological filtration
B) No filtration is needed
C) Chemical filtration
D) Mechanical filtration
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