Orange roughy are easy to over fish. So, humans do. But that doesn't seem to be stopping moves to re-define them as 'sustainable' by the Marine Stewardship Council.
True, when we started fishing orange roughy we didn’t know that this slow-growing,
long-lived, deep water fish was particularly susceptible. But now we definitely do. Orange
roughy can live to a staggering 150 years old, and are at least 30 years old
before they are mature enough to breed. To put that into context: there are
probably orange roughy alive today that were born when Queen Victoria was on
the throne, and they take about 10 times
longer to mature than Atlantic cod.