Details

Autor(en) / Beteiligte

• Rico, R M
• Diaz, RTA
• Chabrillon, M
• Tapia-Paniagua, S
• Pinchetti, J L
• Morinigo, MA
• Figueroa, F L

Titel

Biofiltration of fishpond effluents by using macroalgae and the use algal biomass as functional feed

Ist Teil von

• Phycologia (Oxford), 2009-07, Vol.48 (4)

Erscheinungsjahr

2009

Quelle

Taylor & Francis

Beschreibungen/Notizen

• The biofiltration capacity of fishpond effluents of gilthead seabream (Sparus aurata, L.) by the macroalgae Ulva rigida (Chlorophyta) and Hydropuntia cornea (Rhodophyta) has been evaluated. The algal yield was 25 c 5 mg DW m super(-2) d super(-1) in U. rigida and 49.7 c 17.9 mg DW m super(-2) d super(-1) in H. cornea. Nitrogen uptake efficiency (NUE) was 91.2 c 10.4% and 99.1 c 2.4% and phosphate uptake efficiency (PUE) was 35 c 5.5% and 83.7 c 2.4% in U.rigida and H.cornea respectively. In addition to biofiltration, algal biomass can be used as source of functional feed i.e. both nutritional and immunological properties. Thus, physical and chemical characterization of the algal biomass (proteins, lipids, fatty acids, carbohydrates, C:N ratio, ash, moisture) was carried out and then six experimental diets were formulated with this algal biomass in order to substitute 5, 15 and 25% of fish meal (seaweed weight of total feed weight). Two parameters of the innate immune humoral response were evaluated: the anti-trypsin activity of sera and the alternative pathway of serum complement activity (ACH50). Fish fed with control diet and algal supplemented diets did not show significant differences in their anti-trypsin activity. However, a significant decrease in ACH50 was observed in fish fed with the diet supplemented with the lowest algal content (5%). Feeding with diets corresponding to 25% of both algae did not induce significant differences in ACH50 compared to control fed fish.