Freshwater aquaculture

Unit 5 - Impact of exotic (Introduced) species

5.3. The way forward
The introductions of non-natives into a new region must be considered with great caution. Once in a new location the ecology of the ecosystems must be closely monitored. Care must be taken not just with the species concerned but also with the associated organisms, which may be accidentally introduced with it. There should be strict quarantine of the species indented for introduction before they are introduced in aquaculture facilities.
The escapements should be contained by the following measures.

• Regular inspection of the pond walls – sluice gates and farm effluent outlets.
• The ponds should have secondary back-up containment facilities.
• Predator deterrence should be followed
• Underwater predatory netting around net cages should be provided
• Site surveys, prior to farm construction covering flood frequency, height above water table etc., should be undertaken
• All in-farm fish handling operations to be conducted within continued area.

Introduction can be both harmful and beneficial. Care should be taken to avoid possible adverse effects of introduction of exotic species.