Agriculture and Environment: Salmon

Better Management Practices: Encourage Fallowing

Fallowing can reduce, but not eliminate, the overall impact of net-cage production systems.

Fallowing does not mean leaving net cages unused, but rather moving them from one area of recent production to another area.


This practice spreads the impacts of production over a wider area and gives the ecosystem time to flush and disburse the wastes that accumulate below the net cage. In general, it is not advisable to produce fish in the same location over longer periods of time, as there is an increasing chance of disease.

This practice is equivalent to agricultural fallow systems. An area is not used for production for a number of years (up to 5 for salmon aquaculture) in order to let nature recover from the effects of production (Ellis and Associates 1996).

Provided there is sufficient area for moving net cages, fallowing does not have to reduce overall production, although there would be downtime while moving and setting up net cages in new locations.

Credits

Extracts from "World Agriculture & Environment" by Jason Clay - buy the book online from Island Press

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