Manolis Tsapakis, Eugenia Apostolaki, Vivi Pitta, Ioannis Karakassis

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Biofiltration of fish farm effluents in Crete- the role of macroalgae in nutrient stripping Manolis Tsapakis, Eugenia Apostolaki, Vivi Pitta, Ioannis Karakassis Eilat, 2-4/10/02 Institute of Marine Biology of Crete

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

Filters standing and sampling

Biotic succession on Biofilters A clear succession of the community attached on the fikters were observed. During the initial stages the biomass on the filters is dominated by chlorophytes while at later on is dominated by calcareous alge and hydrozoa.

Sampling of mesocosms

Photosynthesis and Respiration- July experiment (filter deployed in May) Blank

Photosynthesis and Respiration- Sept experiment (filters deployed in May and in July

Phosphorus: paradox?

Mass Balance PON DIN Macrophytes Fauna Biomass 5-10% 15-30% Dust, bacteria, phytopl. DIN Respiration Photosynthesis Macrophytes Fauna Biomass

DIP, DIN and O2 consumption rates (μmoles/hour/filter) Photosynthesis= Day-Night

Mass Balance PON DIN ??? Macrophytes Fauna ??? Biomass 5-10% 15-30% Dust, bacteria, phytopl. DIN Respiration ??? Photosynthesis Macrophytes Fauna ??? Biomass

The new filters consume dissolve inorganic nutrients (N, P) Conclusions The new filters consume dissolve inorganic nutrients (N, P) Old filters remove fine particulate material What is more desirable? Combination strategy?