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3rd Edition of
World Aquaculture and Fisheries Conference

May 24-25, 2023 | Hybrid Event
WAC 2023

Nana Towa Algrient

Nana Towa Algrient, Speaker at Fisheries Congress 2022
University of Dschang, Dschang, Cameroon
Title : Study of the dose of fertilization with pig manure on the productivity and dynamics of three groups of freshwater zooplankton (Rotifera, Cladocera and Copepoda) in a mesocosm


Zooplankton is a living prey better suited to feeding fish larvae due to its small microscopic size. To this end, a test on the productivity in an aboveground environment was carried out in order to contribute to the controlled production of zooplankton intended for the feeding of fish larvae. This trial was conducted for 28 days at the University of Dschang. A total of 5 treatments (T0 to T4) corresponding to doses of 0, 10, 15, 20 and 25 g of slurry per 50 l of water were distributed randomly and in three repetitions in 15 plastic buckets of 60 l capacity. Each of the buckets was stocked with zooplankton at a density of 25 individuals including 12 ind/l of rotifers, 11 ind/l of copepods and 2 ind/l of cladocerans. Data on zooplankton characteristics were collected every 7 days. The main results obtained showed that: the highest density values ??(6914.2 ind/l), daily production (491.2 ind/l/d) and zooplankton biomass (2011.7 µgPS/l) were obtained with the 25 g dose of slurry, followed by those of the 20 g dose (5448.2 ind/l; 1301.9 ind/l/d and 1471.5 µgDS/l). The lowest density (606.4 ind/l), daily production (49.1 ind/l/d) and zooplankton biomass (142.3 µgPS/l) were obtained with the control dose. The peak of zooplankton production varied according to the dose of slurry and the group of zooplankton, that is, 21 days for all doses in rotifers; 21 days for T3 and T4 in cladocera and 21 days for T1, T2 and T3 doses in copepods.

In short, zooplankton productivity increased with the dose of pig manure.

Key words: zooplankton, pig manure, density, biomass, daily production.


Dr NANA Towa Algrient studied at the University of Dschang, where he obtained his Bachelor degree in zoology at the Faculty of Science in 2012, a Master of Science in 2015 and a PhD in 2018 in Aquaculture at the Faculty of Agronomy and Agricultural Sciences. After the PhD, he worked in the Department of Forestry of the same preceding Faculty. He is a member of the Laboratory of Ichthyology and Applied Hydrobiology. He is responsible for about 15 scientific articles.