Easy- Fish are generally very hardy and adaptable with few demands. Most individuals will adapt to captive care very well.
Intermediate- Fish are generally hardy with just a few special few demands. Most individuals will adapt to captive care very well
Difficult- Fish are likely to require a little more specialist knowledge and may be more demanding about their environment.
Very difficult- Fish do not generally acclimatise to captive care very well. They are very demanding about their environment and care. They are only recommended for someone with a specialist knowledge.
Do not keep- Ignore this at your peril. Fish in this category should be avoided, They almost never thrive in captivity even with specialist care. Almost all specimens die prematurely.
Fishbase
Wikipedia
Planet Catfish
Animal Diversity Web
Marine Fishes: 500+ Essential-to-know Aquarium Species by Scott W. MichaelTropical Fish by Braz Walker
ICUN red list of threatened species
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