Environmental Management of Mariculture in Hong Kong  

Project Title: Environmental Management of Mariculture in Hong Kong

Applicant: The University of Hong Kong

Total Approved Grant: $1,388,000

Duration: 15/05/98 to 31/12/00

Project Status/Remarks: Completed

Scope: To develop a robust scientific methodology for environmental management of marine fish culture.

Summary of the Findings/Outcomes: We have worked on this technically demanding project of nearly three years. We have developed a robust three-dimensional hydrodynamic model to compute tidal circulation for the stratified waters of Hong Kong. The model can be coupled with a mass transport (particle tracking) model to compute the flushing time of a fishfarm - a key determinant of the carrying capacity of a fish farm. The model has been applied to six representative marine fish culture zones in Hong Kong. We have also developed a water quality model to predict the response of the fish farm to pollution loading in the dry and the wet season. The carrying capacity of a fish farm (and hence its suitability for any proposed fishfarming activities) can be determined by a simple coupling of the two models.

The project objectives have been largely achieved. We have gained a much better understanding of the meaning of flushing time; a practical method has been developed for its determination. A simple methodology to couple the hydrodynamic and water quality models has been shown to result in sensible predictions of water quality supported by field observations. The methodology is generally applicable to fishfarms located in semi-enclosed coastal waters.