Production de tilapia marin en circuit ferme en eau verte: le Système Aquacole à Recyclage Integral (SARI).

2020 ◽  
Author(s):  
Nicolas de Wilde ◽  
Sylvain Gilles
Keyword(s):  
Fresh Water ◽  
Green Algae ◽  
Breeding System ◽  
Brackish Water ◽  
Energy Savings ◽  
Brachionus Plicatilis ◽  
Clear Water ◽  
Algal Population ◽  
Aquaculture System ◽  
Sarotherodon Melanotheron

Abstract The Integral Recycling Aquaculture System (SARI) is an artificial ecosystem that combines closed-circuit farming of marine tilapia Sarotherodon melanotheron heudelotii with plankton lagooning in brackish water. Compared to conventional closed circuits in clear water, it provides significant advantages in terms of fresh water and energy savings, as well as in terms of health by limiting the introduction of pathogens. A prototype of the SARI located at the IRD Center in Mbour, Senegal, has made it possible to study the functioning of this breeding system. The tilapia S. m. heudelotii, when raised in intensive or semi-intensive mode, promotes the production of the green algae Chlorella sp. which purifies the environment of nitrogenous waste produced by fish. The algal population is regulated by the production of the rotifer Brachionus plicatilis, which itself serves as a complementary feed for the fry in rearing.

Production of marine tilapia in a green-water, closed system in Senegal: the integrated recycling aquaculture system.

2020 ◽  
Author(s):  
Nicolas de Wilde ◽  
Sylvain Gilles
Keyword(s):  
Wastewater Treatment ◽  
Energy Savings ◽  
Brachionus Plicatilis ◽  
Water Levels ◽  
Green Water ◽  
Clear Water ◽  
Aquaculture System ◽  
Suspended Growth ◽  
Growth System ◽  
Sarotherodon Melanotheron

Abstract The Integrated Recycling Aquaculture System (Système Aquacole à Recyclage Intégral, or SARI) is a photosynthetic suspended growth system that combines rearing of euryhaline tilapia (Sarotherodon melanotheron heudelotii) with a recirculating brackish planktonic wastewater treatment. Compared with classical clear-water closed recirculating systems, it brings important advantages in terms of fresh water and energy savings, and biosecurity, by limiting invasion and growth of pathogens. A prototype of SARI was installed and studied at the IRD Centre at Mbour, Senegal. When reared in intensive or semi-intensive conditions, S. melanotheron heudelotii enhances production of green algae, Chlorella spp., which reduce the water levels of ammonia from fish excretion. The algae population is controlled by the rotifer, Brachionus plicatilis, which is also fed to reared fingerlings.

scholarly journals Content of inorganic solutes in lettuce grown with brackish water in different hydroponic systems

2017 ◽  
Vol 21 (3) ◽  
pp. 150-155 ◽  
Author(s):  
Alide M. W. Cova ◽  
Fabio T. O. de Freitas ◽  
Paula C. Viana ◽  
Maria R. S. Rafael ◽  
André D. de Azevedo Neto ◽  
...  
Keyword(s):  
Fresh Water ◽  
Nutrient Solution ◽  
Brackish Water ◽  
Dry Matter ◽  
Dry Matter Production ◽  
Matter Production ◽  
Water Plant ◽  
Hydroponic Systems ◽  
Inorganic Solutes

ABSTRACT The objective of this study was to evaluate the growth and accumulation of ions in lettuce grown in different hydroponic systems and recirculation frequencies. The experimental design was randomized blocks with 8 treatments and 4 replicates. The evaluated hydroponic systems were Nutrient Flow Technique (NFT) and an adapted Deep Flow Technique (DFT), the latter with recirculation frequencies of 0.25, 2 and 4 h. Both systems used fresh water and brackish water. Plant growth, accumulation of inorganic solutes (Na+, K+, Cl- and NO3-) and the correlation between dry matter production and Na+/K+ and Cl-/NO3- were evaluated. The salinity of the water used to prepare the nutrient solution caused decrease in growth and K+ and NO3- levels, and increased contents of Na+ and Cl- in the plants. When using fresh water the highest dry matter production was obtained in the NFT system. In case of brackish water the adapted DFT system increased the production, in relation to NFT system (at same recirculation frequency: 0.25 h). It was found that the choice of the type of hydroponic system and recirculation interval for the cultivation of lettuce depends on the quality of the water used to prepare the nutrient solution.

XII.—The Brackish-water Lochs of North Uist

1937 ◽  
Vol 56 ◽  
pp. 169-195 ◽  
Author(s):  
A. T. Nicol
Keyword(s):  
Fresh Water ◽  
Brackish Water

About the year 1695 Martin Martin visited the Hebrides, and of the Island of North Uist he writes, “There is such a number of fresh water lakes here as can hardly be believed. … They are generally well stocked with trout and eels and some of them with salmon, and, which is yet more strange, cod, ling, mackerel, etc., are taken in these lakes into which they are brought by the spring tides.” This old reference suggested that the brackish-water fauna of the Hebrides might be of considerable interest and extent. Consequently I spent part of the summers of 1933 and 1935 in North Uist in order to study the fauna of the lochs and the conditions under which the animals were living.

Studies on the Fresh Water Poisonous Planktonic Cyanobacteria (Blue Green Algae) of Manchar Lake Dadu, Sindh, Pakistan

2000 ◽  
Vol 3 (11) ◽  
pp. 1973-1975 ◽  
Author(s):  
Mahar M.A. . ◽  
S.I.H. Jafri . ◽  
S.M. Leghari . ◽  
M.Y. Khuhawar . ◽  
A.A. Noor .
Keyword(s):  
Fresh Water ◽  
Green Algae ◽  
Blue Green Algae ◽  
Manchar Lake

Morphotaxonomy of fresh water Chlorophycean algae (Desmids) from Siddharth Nagar, U.P., India

1970 ◽  
Vol 12 ◽  
pp. 21-25
Author(s):  
J. Prakash ◽  
S. Kishore ◽  
D. K. Asthana ◽  
P. K. Mishra ◽  
S. K. Singh
Keyword(s):  
Key Words ◽  
Fresh Water ◽  
Green Algae ◽  
Uttar Pradesh ◽  
Taxonomic Study ◽  
Algal Diversity ◽  
Eastern Uttar Pradesh ◽  
First Time

The taxonomic study of green algae (Desmids) of district Siddharth Nagar, Uttar Pradesh India reveals the presence of ten taxa belonging to family Desmidiaceae the Class Chlorophyceae. The Tal Kunda pond of Siddharth Nagar district showing rich algal diversity. The present paper deals only desmidiacean taxa. These desmids taxa (Euastrum ceylanicum E. spinulosum, Cosmarium quadrum, C. awadhense, Staurastrum gracile, S. sexangulare, Micrasterias zeylanica, M. foliacea, Pleurotaenium ehrenbergii and Desmidium swartzii) though known from other localities of lndia are recorded from district Siddharth Nagar Eastern Uttar  Pradesh for the first time.  Key words: Chlorophyceae; Fresh; water; Desmids doi: 10.3126/eco.v12i0.3193 Ecoprint: An International Journal of Ecology 12: 21-25, 2005

Application of geothermal energy for heating and fresh water production in a brackish water greenhouse desalination unit: A case study from Algeria

2010 ◽  
Vol 14 (1) ◽  
pp. 512-517 ◽  
Author(s):  
Hacene Mahmoudi ◽  
Nawel Spahis ◽  
Mattheus F. Goosen ◽  
Noreddine Ghaffour ◽  
Nadjib Drouiche ◽  
...  
Keyword(s):  
Fresh Water ◽  
Brackish Water ◽  
Geothermal Energy ◽  
Water Production

scholarly journals Response of Water-Salt Migration to Brackish Water Irrigation with Different Irrigation Intervals and Sequences

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2089 ◽  
Author(s):  
Zhu ◽  
Yang ◽  
Sun ◽  
Zhang
Keyword(s):  
Fresh Water ◽  
Brackish Water ◽  
Irrigation Treatment ◽  
Water Infiltration ◽  
Laboratory Simulation ◽  
Irrigation Interval ◽  
Significant Difference ◽  
Soil Desalination ◽  
The Mean ◽  
Irrigation Treatments

Establishing methods for scientific and rational use of brackish water resources is the key to farmland irrigation in the Yellow River Delta region of China. In this study, we conducted laboratory simulation experiments with soil columns and monitored the changes in water infiltration and salt distribution under eight irrigation treatments, including four intervals (0, 30, 60, and 90 min between irrigations) and two sequences (brackish-brackish-fresh water and brackish-fresh-brackish water). The results showed that the duration of water infiltration into the soil was higher under intermittent irrigation than continuous irrigation, with the highest value recorded at the 90-min irrigation interval. There was no significant difference in the mean soil water content between the brackish-brackish-fresh water (28.01–29.71%) and brackish-fresh-brackish water (28.85–29.98%) irrigation treatments. However, the mean soil desalination rate of the brackish-brackish-fresh irrigation treatment (42.51–46.83%) was higher than that of the brackish-fresh-brackish irrigation treatment (39.48–46.47%), and a much higher soil desalination rate was observed at the 90-min irrigation interval, compared with the other intervals. In conclusion, brackish-brackish-fresh water irrigation at longer time intervals (e.g., 90 min between irrigations) is conducive to reduce soil salt content in the surface soil in the study region.

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