Environmental Parameterss Vs. Plankton Incidents

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Environmental parameters Vs Plankton Incidents:
The graphs presented in figureX to figureX, environmental parameters observed at different sites in each area are presented area wise along with the harmful plankton incidents observed. Average temperature, dissolved oxygen and salinity observed each day at each farm site is used to plot these graphs. There has been a notion that with drop in salinity, which means freshwater run off, there would be increase in nutrients and supporting higher plankton growth. But, it is not always true. Upwelling events bring up more nutrients where they can be used (surface layers) compared to fresh water runoff. The reason some plankton grow more when there is freshwater runoff is because of the drop in salinity
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Nutrient monitoring along with environmental parameters monitoring would help in developing models for predicting harmful plankton blooms development. Water samples were analyzed for levels of Nitrate, Phosphate, Silicate, Iron, total ammonia nitrogen (TAN) and pH. N and P are essential for any plankton growth. Silica is essential for diatom growth. In case of low N levels, TAN could also be used as a source of N. Iron is essential nutrient for plankton growth as well. In case of sudden spike in nutrient levels in particular the essential nutrients and presence of favorable conditions like water temperature and enough sunlight, would lead to plankton bloom events. Nutrient loading usually occurs through upwelling and freshwater runoff after rain or snowpack melt in the summer. During upwelling events nutrient rich ground water would be brought up to the surface layers. If there is a spike in nutrient levels without any rainfall and low water temperature and low dissolved oxygen were observed, it usually implies to upwelling events. Upwelling can be localized and could also bring up the resting cysts of harmful plankton. Upwelling at known hotspots would lead to a bloom event during favorable …show more content…
As phytoplankton cannot swim, tides play an important role in spreading the harmful plankton around. Knowing which tide was bringing in harmful plankton helps a lot in decision making process of whether to feed or not. This information can make a considerable difference in saving lost feed days. The tide information recorded with plankton data is analyzed against the plankton incidents observed in each area. From the data it can be observed that sampling done on flood tide was considerably more than the sampling done on ebb tide. The tide information which was in text was converted in to numbers for graphing purposes. The plots are presented below from figureX to figureX. In Broughton area, two major plankton events can be seen. The first event which was harmful Chaetoceros, came in on flood tide mostly and then spread in the area. But later event which was Heterosigma bloom happened in the area and came on to sites on ebb tide. Same is also true in Klemtu area. There were two major events, Heterosigma earlier and harmful Chaetoceros later in the season. Heterosigma came on to sites mostly on the ebb tide and harmful Chaetoceros was observed on flood tide mostly. In Port Hardy area, there was one major event, harmful Chaetoceros which was brought in on to sites by flood tide. In Quatsino area, there were Heterosigma, harmful Chaetoceros and

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