Examples of aquarium

• After 24 h infected fish were checked for infection and transferred to 200 l glass aquaria where they were kept for 8 weeks.

• Over the last decade or so, the demand for aquatic plants has strongly increased in order to supply private aquariums, garden tanks or botanical gardens.

• Six of these infection aquaria were used, each containing 175- 445 parasites and 12-26 recipients.

• The aquaria were covered with dark cloth and placed in dark temperature controlled rooms to reduce irrelevant and stressful stimuli.

• The remaining unexposed sibs were maintained in two 100 l aquaria in the same room.

• Separate experimental aquaria were used to allow collection of fish in complete darkness without disrupting other animals.

• After io injection, goldfish were returned to their home aquaria to recover.

• One dytiscid species was tested at a time, and 12 aquaria were used in each of the experiments, eight containing a predator and prey and four controls with prey only.