MERAMOD is a particle tracking model used for predicting flux of particulate waste material and associated benthic impact of fish farms. Simulated particles sink and are displaced by currents and random­walk eddy disperion. Shear in the water column can be represented by layers in the model.

Net depositional flux is predicted in g m­2 yr­1 on a 2­D grid beneath a cage. Benthic community impact is predicted by an empirical relationship between depositional flux and univariate indices. Sediment content (g kg­1) of a particulate component, such as a medicine, can also be predicted.

Developed by Chris J. Cromey, Scottish Association for Marine Science, Scottish Marine Institute, Oban, UK.


Suggested users: Aquaculture producers, regulators

Format: Computer programme

Cost: Single payment (contact developer)

Data requirements: A current velocity timeseries is needed for an area close to the fish farm site, together with some knowledge of the vertical structure of the water column. Bathymetry and number and dimensions (length, width and depth) of cages and the proposed/existing positions of these cages. Feed input data (kg food d­1 for the whole farm).

Time requirements: It will take few minutes to run if the data is available

Required resources: Standard computer with Windows XP

Prior knowledge: Some understanding of marine aquaculture systems and management practices. There is a guidance document to help use the tool.