Mathematical modelling of flow, pesticide and nutrient transport for fish-farm planning and management
Abstract In recent years, there has been a rapid growth in fish farming, particularly salmon farming, in UK and Eire coastal waters. This increase in production has also led to an awareness by the fish-farming industry that over-production could have a deleterious effect on the hydro-ecology of coastal waters, which would inhibit the maintenance of current production farming levels. In planning a fish-farm configuration for coastal basins, complex deterministic mathematical models can provide invaluable information for farm optimisation, with the models predicting the tidal current structure and solute levels in the basin. Details are given herein of a refined mathematical model for predicting tidal current and Nuvan, biochemical oxygen demand (BOD) and nitrogen levels for a proposed fish-farm configuration in a bay off the Eire coastline. The model accurately predicts field-measured velocities at two sites within the bay, and further predicts Nuvan, BOD and nitrogen levels that are well below those levels which would be known to affect adversely the hydro-ecology of the bay.
ECONOMIC ANALYSIS OF THE ENVIRONMENTAL IMPACT ON MARINE CAGE LOBSTER AQUACULTURE IN VIETNAM
..............................................................................................................................1 Chapter
Degradation of trichlorfon to dichlorvos in seawater: A preliminary report
Abstract A HPLC method to measure the degradation of trichlorfon to dichlorvos in seawater at different temperatures is presented. Seawater containing the trichlorfon and dichlorvos was injected directly into the HPLC system without any pretreatment. Detection was by UV at 205 nm. The sensitivity for trichlorfon was 1 ppm, and for dichlorvos 0.02 ppm.