Validation of DEPOMOD with a comparison of visual techniques for observing spatial and temporal variability in the benthos at active and fallowed finfish sites in Newfoundland

Description

Most finfish aquaculture sites in Newfoundland are located over deep waters (>100 m) with hard substrates and low currents which results in high monitoring costs relative to other Atlantic provinces. This is due to the need for more expensive equipment and technology use in gaining information about conditions of the sea floor. The current monitoring program was based on the assumption that deep water sites with hard substrates are not depositional; however, organic particulate has been found to accumulate at some sites. In this project, techniques are being investigated that will provide a better understanding of the physical and biological processes near finfish aquaculture sites over hard substrates.

A model of particle dispersion, DEPOMOD, is being evaluated as a monitoring tool for depositional processes at finfish aquaculture sites in Newfoundland. Data collection for model inputs has involved the deployment of sediment traps and current meters. The response of the benthic community to organic inputs is also being studied through the use of various methods of underwater video sampling (drop cameras, remotely operated vehicles, time-lapse cameras).

Program Name

Aquaculture Collaborative Research and Development Program (ACRDP)

Year(s)

2010 to 2011

Ecoregion(s)

Atlantic: Newfoundland, Labrador Shelves

Principal Investigator(s)

Andry Ratsimandresy
Email: Andry.Ratsimandresy@dfo-mpo.gc.ca