Biotechnologie, Agronomie, Société et Environnement (Jan 2018)

Utilisation rationnelle de fertilisants organiques pour la production de macroinvertébrés benthiques d'eau douce en pisciculture

  • Adande, R.,
  • Dine Liady, MN.,
  • Janvier Bokossa, HK.,
  • Djidohokpin, G.,
  • Zouhir, F.,
  • Apollinaire Mensah, G.,
  • Fiogbe, DE.

Journal volume & issue
Vol. 22, no. 4
pp. 208 – 219

Abstract

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Rational utilization of organic fertilizers for freshwater benthic macroinvertebrate production in fish farming. Description of the subject. This study aims to determine optimal conditions of rabbit manure utilization in freshwater benthic macroinvertebrate production in order to produce fish at low cost. Objectives. To determine the optimal dose of rabbit manure to be used for freshwater macroinvertebrate production. Method. Six treatments, including one control, received respectively 0%, 10%, 25%, 50%, 75% and 100% of rabbit manure compared to the substrate total volume. Cultures were carried out in buckets, which received 10 dm3 of substrate, 16 dm3 of groundwater and 4 dm3 of fishpond water. The initial seeding density was 6 ind·dm-2 of odonates, 6 ind·dm-2 of annelids or (3 ind·dm-3, for 0.5 m depth), 8 ind·dm-2 of chironomids or (4 ind·dm-3) and 10 ind·dm-2 of mollusks or (5 ind·dm-3). Physicochemical and biological parameters were measured during the 63 days of the experiment. Results. The highest densities of benthic macroinvertebrates were obtained within treatment T2, with 192 ± 1.20 ind·dm-2 of chironomids, 52 ± 0.8 ind·dm-2 of mollusks, 6 ± 0.33 ind·dm-2 of odonates and 6 ± 0.33 ind·dm-2 of annelids. Considering the depth of our experimental buckets (0.5 m), these highest densities also corresponded to respectively: 96 ± 1.20 ind·dm-3 of chironomids, 26 ± 0.8 ind·dm-3 of mollusks, 3 ± 0.33 ind·dm-3 of odonates and 2 ± 0.33 ind·dm-3 of annelids). The highest biomass of chironomids and mollusks was obtained within treatment T2, with respectively 728.1 ± 2.23 mg dry matter·dm-2 and 699.98 ± 22.49 mg dry matter·dm-2 (i.e. respectively 364.05 ± 2.23 mg dry matter·dm-3 and 349.99 ± 22.49 mg dry matter·dm-3). Conclusions. Considering these results, treatment T2 with 140 g dry matter of rabbit manure·dm-2 of substrate (i.e. 75 g dry matter of rabbit manure·dm-3 of substrate) could constitute the optimal dose that could be recommended for the optimal production of freshwater benthic macroinvertebrates.

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