The Northern Territory's new Independent Commissioner Against Corruption has decided to conduct fewer investigations.

Michael Riches became the leader of the NT's anti-corruption watchdog in July, taking over from the inaugural commissioner Ken Fleming QC.

Mr Fleming published the findings of just eight investigations during his three-year tenure. 

In the ICAC's annual report this week, the new commissioner said he wants a clear focus on the most serious issues. 

He says he will only investigate lower level breaches in exceptional circumstances. 

The ICAC Act includes several categories of improper conduct, ranging from higher-level “corrupt” conduct to lower-level “misconduct” and “unsatisfactory” conduct.

“I will focus my investigation activities on what I consider to be the most serious or significant allegations of improper conduct,” Mr Riches said.

“Corrupt conduct and serious anti-democratic conduct will be my focus.

“I do not intend to investigate misconduct or unsatisfactory conduct except in exceptional circumstances.

“We will conduct fewer investigations at any one time in order to focus resources and bring about more timely conclusions.”

Of 641 allegations assessed by NT ICAC last financial year, 185 were classified as corrupt conduct, 291 as misconduct, 95 as unsatisfactory conduct and 9 as anti-democratic behaviour.

Sixty-six allegations proceeded to the investigation stage.