Current Status and Historical Trends of Brown Tide and Red Tide ...

In spite of the warm temperatures and high organic loads in the water columnduring the brown tide event, there have been no major fish kills reported in theCCBNEP that can be traced to anoxic events. This is due primarily to the shallow, wellmixed water column, which does not allow water near the bottom to be isolated from thesurface for long periods of time. Dissolved oxygen levels typically remain above 2 mg/l,even during warm summer months with high brown tide concentrations (Figure 11).D.O. levels at the CPL intake '93-'94109876D.O. (mg/L)5432106/30/93 8/19/93 10/8/93 11/27/93 1/16/94 3/7/94 4/26/94 6/15/94 8/4/94 9/23/94 11/12/94 1/1/95DateFigure 11. Morning dissolved oxygen levels measured in seawater at the intake to theCentral Power and Light electrical generating station. Samples taken betwee 4:00 and5:00 AM. Data provided by GCCA/CPL redfish hatchery.6. NutrientsPrior to the bloom of the Texas brown tide alga, concentrations of dissolvedinorganic nitrogen (DIN) in Baffin Bay and Upper Laguna Madre increased from