Arrowanas are endangered. AVA only allows sale of licensed and tagged arros. There are others, but I am too tired to think...
As for wild angels, think it's cos the domesticated ones are more colourful and spawn much more readily... Amazonian fishes are mostly safe from extinction. EXCEPT the arapaima, the largest fish in the world. But it is endangered cos of over fishing for its meat by the locals.
Some of the African and Australian fish are somewhat endangered, though. An example would be the fish from Lake Victoria. Over fishing and introduction of competitive non-native tilapia had caused many species to become extinct or endangered. West African fish MIGHT be endagered but no one knows as the civil wars and unrest had restricted the exploration and exportation of fish from that area.
Actually the reasons why most fish become endangered are mostly due to the following reasons:
1) Over fishing for FOOD, not the ornamental trade
2) Enviromental pollution
3) Introduction of exotic species to compete for food ( )
Brazilian fishermen are actually taught HOW to catch fish for the ornamental trade so as to prevent over catching. There is an University in Manaus, the capital of Amazonian ornamental fishing doing research on this.
Thus, it is important to protect our environment from pollution and the introduction of non-native exortic species.
There you go...
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