It was not understood that this species as not like other fish we had known.
The Orange Roughy grows very slowly and isn't capable to reproduce until the age of twenty.
Something we had not noticed until it was too late.
Fisherman were not capable of reaching the Orange Roughy until the 1970's, but once they did, eating Orange Roughy became fashionable in Australia, the united states and many other places in the world well into the 1990's.
As the Orange Roughy became a wanted fish, fisherman hauled up tons of Orange Roughy not noticing the quick decrease in the population.
This is the sad story of how the Orange Roughy became one of the world's most threatened fish populations within decades of being discovered by us.
Who knows what years of dragging nets through these deep unknown oceans is doing to deepwater ecosystems. We are probably damaging and destroying spieces we haven't yet discovered.
This should serve as a caution to what could happen to anything in the ocean.