Biofiltration of fish farm effluents in Crete- the role of macroalgae in nutrient stripping Amsterdam, 29-30/1/03 Institute of Marine Biology of Crete.

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Presentation transcript:

Biofiltration of fish farm effluents in Crete- the role of macroalgae in nutrient stripping Amsterdam, 29-30/1/03 Institute of Marine Biology of Crete Manolis Tsapakis, Eugenia Apostolaki, Vivi Pitta, Ioannis Karakassis

1.When should we deploy the filters 2.When should we replace the filters 3.How many filters should we deploy … in order to remove the maximal amount of N & P and fine particles from the system. Objectives - Strategy

Filters standing and sampling

Biotic succession on Biofilters

Sampling of mesocosms

Dissolve oxygen July Experiment Sept. Experiment Nov.Experiment

Ammonia trends

Phosphate Trends

Oxygen fluxes: Two months biofilters DAY NIGHT

NH 4 fluxes: Two months biofilters DAY NIGHT

PO 4 fluxes: Two months biofilters DAY NIGHT

Oxygen fluxes during the night experiment vs water temperature

NH 4 fluxes during the day experiment vs Solar irradiation

Mass Balance of Nitogen in Sitia fish farm Fish Biomass: ~1000tn Feed per Day: 1000kg Nitrogen (8%): 80kg Released as NH 4 (~20%): 16 kg Released as total dissolve N (60%): 48kg Released as fine particulate matter (4-6%): kg Then The estimated consumption of dissolve NH4 during a day of a two month Biofilter is approximately 1.3 mg N

During the day the biofilters uptake dissolve inorganic nutrients (N, P) & fine particulate matter and release oxygenDuring the day the biofilters uptake dissolve inorganic nutrients (N, P) & fine particulate matter and release oxygen The uptake rate of dissolve N is depending from the solar irradiationThe uptake rate of dissolve N is depending from the solar irradiation During the night the biofilters consume fine particulate matter and release NH 4 and PO 4.. In addition, they consume oxygenDuring the night the biofilters consume fine particulate matter and release NH 4 and PO 4.. In addition, they consume oxygen Conclusions

New design Do you think that the micro bioassay experiment in large scale could be a good biofiletr?Do you think that the micro bioassay experiment in large scale could be a good biofiletr? What to you think if we fill the dialysis bag with high density phytoplankton?What to you think if we fill the dialysis bag with high density phytoplankton? The product may can be used by the fish farm hatchery.The product may can be used by the fish farm hatchery. Dialysis Bag High density phytoplacton