(Optional) Identify common species of pet fish.

Identification should include

• the most common species of pet fish (e.g., goldfish, betta fish, oscars, koi)
• their origins
• the unique physical characteristics of each species. 

Process/Skill Questions:

• Why are betta fish such popular pets?
• How large can an adult koi fish grow?
• How does habitat size affect the growth of the fish?