Queensland’s late night operators in busy party districts say their businesses have suffered dramatically at the hand of new legislation meant to tackle alcohol-fuelled violence.

The legislation which came into effect six months ago has led to some operators business profits falling up to 50 per cent.

One bar manager spoke about how his venue suffered a 15-20 per cent drop in earnings since the legislation was introduced.

Some bars have even had to close their doors due to bad business which business owners say is due to the legislation.

Controversial lockout laws which came into effect on February 1, it is feared will only worsen the problem.