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How to Identify and Classify Danios
  • 1. Which fin is NOT typically used for identifying Danio species?
A) Caudal fin
B) Adipose fin
C) Anal fin
D) Dorsal fin
  • 2. What body shape is most common among Danio species?
A) Globular
B) Eel-shaped
C) Torpedo-shaped
D) Disk-shaped
  • 3. What is the primary diet of most Danios in the wild?
A) Insects and invertebrates
B) Detritus
C) Algae
D) Plant roots
  • 4. What type of water parameters do Danios generally prefer?
A) Very acidic
B) Slightly acidic to neutral
C) Highly alkaline
D) Brackish
  • 5. Which Danio species is known for its bright horizontal stripes?
A) Glowlight Danio (Danio choprai)
B) Zebra Danio (Danio rerio)
C) Giant Danio (Devario aequipinnulus)
D) Pearl Danio (Danio albolineatus)
  • 6. The term 'Devario' refers to what?
A) A type of Danio food
B) A related genus of larger Danios
C) A disease affecting Danios
D) A specific fin pattern
  • 7. What is the typical size range for most Danio species?
A) 1 foot or more
B) 1-3 inches
C) 5-7 inches
D) 8-10 inches
  • 8. What behavior is common among Danio species?
A) Solitary bottom-dwelling
B) Nocturnal hunting
C) Active schooling
D) Aggressive territoriality
  • 9. Which feature is LEAST helpful in identifying a Danio?
A) Fin ray count
B) Scale size
C) Color pattern
D) Body shape
  • 10. What is the general region of origin for most Danio species?
A) Australia
B) South America
C) Africa
D) Southeast Asia
  • 11. Which Danio is known for its shimmering, iridescent scales?
A) Celestial Pearl Danio (Danio margaritatus)
B) Pearl Danio (Danio albolineatus)
C) Zebra Danio (Danio rerio)
D) Leopard Danio (Danio frankei)
  • 12. What does 'sexually dimorphic' mean?
A) They can change their sex
B) Males and females have different appearances
C) They only reproduce in groups
D) They reproduce asexually
  • 13. How do you typically tell male and female Danios apart?
A) Males have longer fins
B) Males are always larger
C) Females have brighter colors
D) Females are usually rounder
  • 14. Which of these is NOT a common color seen in Danios?
A) Gold
B) Purple
C) Blue
D) Silver
  • 15. The Celestial Pearl Danio (Danio margaritatus) is also known as:
A) Galaxy Rasbora
B) Ruby Barb
C) Emerald Tetra
D) Diamond Guppy
  • 16. What type of spawning behavior is typical for Danios?
A) Nest builders
B) Livebearers
C) Egg scatterers
D) Mouthbrooders
  • 17. What is a good tank size for a small school of Danios?
A) 10 gallons
B) 2 gallons
C) 5 gallons
D) 50 gallons
  • 18. What type of current do Danios prefer in their tank?
A) Stagnant water
B) Moderate current
C) No current
D) Very strong current
  • 19. Which Danio species can grow to be quite large, reaching up to 4 inches?
A) Zebra Danio (Danio rerio)
B) Giant Danio (Devario aequipinnulus)
C) Spotted Danio (Danio nigrofasciatus)
D) Glowlight Danio (Danio choprai)
  • 20. What is the scientific name for the Glowlight Danio?
A) Danio rerio
B) Danio choprai
C) Danio albolineatus
D) Danio margaritatus
  • 21. Which fin is the most important for propulsion in Danios?
A) Anal fin
B) Dorsal fin
C) Pectoral fin
D) Caudal fin
  • 22. What is a common symptom of illness in Danios?
A) Increased appetite
B) Clamped fins
C) Brighter colors
D) Increased activity
  • 23. What does the term 'shoaling' refer to?
A) Laying eggs
B) Swimming together in a loose group
C) Aggressively defending a territory
D) Hiding amongst plants
  • 24. Which of these is a common behavior exhibited by Danios?
A) Hunting larger fish
B) Playing in the filter current
C) Burying themselves in the substrate
D) Building bubble nests
  • 25. Which of these tankmates is NOT generally suitable for Danios?
A) Aggressive, fin-nipping species
B) Small tetras
C) Corydoras catfish
D) Peaceful rasboras
  • 26. What is a good indicator of water quality in a Danio tank?
A) Cloudy water
B) High ammonia levels
C) Clear water and stable parameters
D) A strong fishy odor
  • 27. How often should you perform water changes in a Danio tank?
A) Monthly
B) Every six months
C) Only when the water is visibly dirty
D) Weekly or bi-weekly
  • 28. What is the approximate lifespan of a well-cared for Danio?
A) 6-8 years
B) 10+ years
C) 1-2 years
D) 3-5 years
  • 29. What food form is best for Danios?
A) Vegetable matter only
B) Large sinking pellets
C) Live goldfish
D) Small flakes or pellets
  • 30. Which Danio species has vertical bars instead of horizontal stripes?
A) Spotted Danio (Danio nigrofasciatus)
B) Giant Danio (Devario aequipinnulus)
C) Pearl Danio (Danio albolineatus)
D) Zebra Danio (Danio rerio)
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