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Article

Multispecies Fresh Water Algae Production for Fish Farming Using Rabbit Manure

1
Laboratory of Research on Wetlands (LRZH), Department of Zoology, Faculty of Sciences and Technology, University of Abomey-Calavi, B.P. 526 Cotonou, Benin
2
Department of Biology, Research Unit in Environmental Biology, University of Namur, 5000 Namur, Belgium
*
Author to whom correspondence should be addressed.
Received: 27 July 2020 / Revised: 17 October 2020 / Accepted: 19 October 2020 / Published: 30 November 2020
(This article belongs to the Special Issue Environmental Impacts of Land-Based Aquaculture)
The current study aims at determining the optimal usage conditions of rabbit manure in a multispecies fresh water algae production for fish farming. This purpose, the experimental design is made of six treatments in triplicate including one control T0, T1, T2, T3, T4, T5 corresponding respectively to 0, 300, 600, 900, 1200, 1500 g/m3 of dry rabbit manure put into buckets containing 40 L of demineralized water and then fertilized. The initial average seeding density is made of 4 × 103 ± 2.5 × 102 cells/L of Chlorophyceae, 1.5 × 103 ± 1 × 102 cells/L of Coscinodiscophyceae, 3 × 103 ± 1.2 × 102 cells/L of Conjugatophyceae, 2.8 × 103 ± 1.5 × 102 cells/L of Bascillariophyceae, and 2.5 × 103 ± 1.4 × 102 cells/L of Euglenophyceae. During the experiments, the effects of these treatments on abiotic and biotic parameters (chlorophyll-a concentration, phytoplankton density and algal density) of different production media were monitored. Results show that average density of different phytoplankton classes is higher in treatment T5 (7.91 × 108 ± 6.78 × 107 cells/L) followed by T4 (5.56 × 108 ± 4.27 × 107 cells/L), T2 (3.87 × 108 ± 3.10 × 108 cells/L), T3 (3.79 × 108 ± 3.18 × 108 cells/L, with high significant difference (F (4,84) = 5, 35, p < 0.00). Chl-a concentration varied from 0.07 ± 0.05 mg/L (T0) to 14.47 ± 12.50 mg/L (T5) with high significant differences observed among treatments (F (5,83) = 3,09, p = 0,01). In addition, fourteen (14) species belonging to eight (8) families, five (5) classes and three (3) phyla were identified in our different production media. During the culture, Chlorophyceae class was the most represented in all treatments with 5 species (36% of the specific diversity) while Euglenophyceae class (7%) was the least represented with only one (01) species. According to these results, treatments T2 (600 g/m3), T3 (900 g/m3) and T4 (1200 g/m3) of dry rabbit manure are those worthy to be recommended as an alternative for a low cost massive production of multispecies freshwater algae that can be easily used by freshwater zooplankton and macroinvertebrates. Indeed, despite the best performances that it shows, treatment T5, presents important eutrophication’s risks. View Full-Text
Keywords: aquaculture; multispecies algae; rabbit manure; production; zooplankton aquaculture; multispecies algae; rabbit manure; production; zooplankton
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MDPI and ACS Style

Richard, A.; Nourou Dine, L.M.; Gildas, D.; Dogbè Clément, A.; Tobias Césaire, A.M.; Jean-Claude, M.; Didier Emile, F. Multispecies Fresh Water Algae Production for Fish Farming Using Rabbit Manure. Fishes 2020, 5, 35. https://0-doi-org.brum.beds.ac.uk/10.3390/fishes5040035

AMA Style

Richard A, Nourou Dine LM, Gildas D, Dogbè Clément A, Tobias Césaire AM, Jean-Claude M, Didier Emile F. Multispecies Fresh Water Algae Production for Fish Farming Using Rabbit Manure. Fishes. 2020; 5(4):35. https://0-doi-org.brum.beds.ac.uk/10.3390/fishes5040035

Chicago/Turabian Style

Richard, Adandé, Liady M. Nourou Dine, Djidohokpin Gildas, Adjahouinou Dogbè Clément, Azon M. Tobias Césaire, Micha Jean-Claude, and Fiogbe Didier Emile. 2020. "Multispecies Fresh Water Algae Production for Fish Farming Using Rabbit Manure" Fishes 5, no. 4: 35. https://0-doi-org.brum.beds.ac.uk/10.3390/fishes5040035

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