11) What is the primary source of caviar?
12) How many species of freshwater fish are there worldwide?
13) What percentage of Earth's water is made up of rivers, lakes, and wetlands?
14) What is the minimum tank size for Clown Lo cichlids?
15) What are anadromous fish?
16) What is the estimated percentage of North American freshwater fish species that have become imperiled in recent decades?
17) Which of the following is not a beginner friendly nano fish?
18) What are the key features of a good community fish?
19) What is the minimum tank size for Otocinclus catfish?
20) What is the best tank mate for Sparkling Gouramis?