Teachers in Christchurch could face jobs cuts as school rolls in the eastern suburbs drop by up to 20%.
Hundreds of students have left the area, enrolling in schools in other parts of the country and in some cases, overseas.
Aranui High School's roll has fallen from more than 600 to 500 students.
Acting principal Jacky Young says the Ministry of Education has guaranteed staffing levels for the year but she would like that to be extended through to 2012.
Some 140 students have tranferred from Avonside Girls High School, which itself has relocated to share facilities with Burnside High.
Principal Sue Hume says teachers are feeling particularly vulnerable about their work situation, and to have some kind of job security would help with their levels of stress.