To ask the Secretary of State for Scotland how many rivers, canals and lakes have been deemed a hazard to public health as a result of algal blooms in each of the last five years. [34628]

[holding answer 13 July 1995]: A total of 124 episodes of blue green algae—cyanobacteria—occurring in fresh waters in Scotland have been reported to he Scottish Centre for Infection and Environmental Health since surveillance commenced in 1992. The annual numbers of episodes reported were:

• 1992: 15
• 1993: 36
• 1994: 45
• 1995: 28 (to 30 June)

In each episode, action has been taken to prevent risk to public health. This has focused principally on the provision of advice to avoid skin contact with, or ingestion of, aigal scums. No human health effects have been associated with blue green algal episodes by the surveillance programme.