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4 results on '"Hotèkpo Hervé Akodogbo"'

1. Effet de l’assèchement sur les caractéristiques physico-chimiques des eaux de ruisseaux affluents des rivières Alibori et Sota au nord Bénin

Author

Zoulkanerou OROU PIAMI, Hotèkpo Hervé AKODOGBO, Fadéby Modeste GOUISSI, Koudjodé Simon ABAHI, Yaya IDRISSOU, and Midogbo Pierre GNOHOSSOU

Subjects
General Works
Abstract

L’objectif de cette étude est de déterminer les impacts physico-chimiques des assèchements sur les affluents des rivières Alibori et Sota au nord Bénin. Des paramètres physiques ont été mesurés in situ dans les eaux de cinq ruisseaux (Bouli, Irané, Tassiné,Sanson et Yassikoga) et les paramètres chimiques ont été mesurés au laboratoire. Les résultats ont montré des différences de valeurs des paramètres physico-chimiques entre avant assèchement (T°C: 19,3 et 23,9 °C), pH (6,7 et 7,8), TDS (8,5 ppm et 20,5 ppm), NH4+ (0,075 et 0,5 mg/l) et P2O5 (0,07 et 0,16 mg/l) et après assèchement (T°C: 26,5 et 33,6 °C), pH (3,2 et 6,5), TDS (26,5 et 30,1 ppm); NH4+ (0,3 et 0,57 mg/l) et P2O5 (0,07 et 0,16 mg/l). Les différences saisonnières de ces valeurs révèlent les effets néfastes de l’assèchement sur les paramètres physico-chimiques des eaux des milieux d’études. Parmi les cinq ruisseaux étudiés, Yassikoga a présenté l’eau la plus chaude, la plus acide, la plus troublée, avec une plus forte concentration en ion NH4+ et en P2O5. Mots clés: Assèchement des rivières, Caractéristiques physico-chimiques, Ruisseaux affluents, rivières, Alibori, Sota, Nord Bénin

Published
2023

2. Zooplankton Community of Cotonou Port Basin in Guinean Gulf: First Data

Author

Hotèkpo Hervé Akodogbo, Fridolin Ubald Dossou-Sognon, Fadéby Modeste Gouissi, Patrick Junior Kouglo, Arnaud Assogba, Emile Didier Fiogbe, Hotèkpo Hervé Akodogbo, Fridolin Ubald Dossou-Sognon, Fadéby Modeste Gouissi, Patrick Junior Kouglo, Arnaud Assogba, and Emile Didier Fiogbe

Abstract

The Autonomous Port of Cotonou in Benin hosts several activities in its port basin exposing it to pollution and biological invasions risks. To provide a basic knowledge on this port basin's zooplanktonic community structure, four quarterly sampling campaigns (July and October 2020 then January and April 2021) were conducted to collect zooplankton using a plankton net of 53 µm mesh, weighted to a depth of 05 m. Thirty-five (35) taxa plus nauplii and other unidentified copepods were recovered from the port basin and then distributed into nine (9) groups, making an average density of 23613.62 ind/m3. Copepods were the most abundant group (97.97% of the total density) with Oithona spp. as the most abundant taxon (20% of the total density). July was the most abundant month for zooplankton. These results will be used for future assessment of the status of this ecosystem.

Published
2023

3. Valorization of Benthic Macroinvertebrates Produced from Pig Dung in Clarias gariepinus Fries Feeding

Author

Hotèkpo Hervé Akodogbo, Koudjodé Simon Abahi, Fridolin Ubald Dossou-Sognon, Emile Didier Fiogbe, Hotèkpo Hervé Akodogbo, Koudjodé Simon Abahi, Fridolin Ubald Dossou-Sognon, and Emile Didier Fiogbe

Abstract

Fish feeding is one of the main factors hindering the development of fish farming in developing countries. The objective of this study was to determine the optimal artificial feed ration to be fed as a supplement to macroinvertebrate fed fry for semi-intensive production of Clarias gariepinus. To this end, the survival and growth performance of Clarias gariepinus fries fed with macroinvertebrates produced from pig dung and artificial feed were compared to those of fry fed with dry feed only. Fries with an initial weight of 0.52 ± 0.15g were distributed in the 15 buckets with a density of 0.6 ind.L-1 and grouped into four (04) treatments (T1, T2, T3 and T4) and a control (T0); they were fed for 05 weeks. Fries reared in T1, T2, T3 and T4 were fed with 75%, 50%, 25% and 0% dry feed respectively, while those in T0 were fed with 100% dry feed. All four treatments contain macroinvertebrates produced in mass. The physicochemical parameters of the water, the survival and growth parameters of the fry were assessed. The results showed that the physicochemical parameters of the water were within the recommended standards for the culture of the majority of aquatic species The average final weight and specific growth rate of the fries were highest in T0 (11.95 ± 0.06 g and 8.96 ± 0.014 %.d-1), followed by T1 (10.50 ± 0.8 g and 8.58 ± 0.2 %.d-1) and T2 (10.16 ± 0.50 g and 8.49 ± 0.14 %.d-1). They are very low in T4 (01.35 ± 0.11 g and 2.72 ± 0.23 %.d-1). The specific growth rate and survival rate of T1, T2 and T0 were not significantly different (p > 0.05). T1 and T2 will therefore reduce the amount of artificial feed to be distributed; however, the optimal rate was 50% (T2). It is therefore possible to reduce the cost of fish products in a semi-intensive system.

Published
2023

4. Assessment of the water quality of the upper reaches of the ouémé river in benin using benthic macroinvertebrate-based biotic indices

Author

Sorébou Hilaire Sanni Worogo, Pierre Midogbo Gnohossou, Hotèkpo Hervé Akodogbo, Ayodélé Shola David Darius Adje, Modeste Fadéby Gouissi, and Koudjodé Simon Abahi

Subjects
Pollution, Index (economics), Social Sciences and Humanities, 010504 meteorology & atmospheric sciences, media_common.quotation_subject, macroinvertebrates, 010501 environmental sciences, 01 natural sciences, Chironomidae, water quality, pollution, 0105 earth and related environmental sciences, Water Science and Technology, Invertebrate, media_common, indices biotiques, Hydrology, qualité de l’eau, biology, biotic indices, biology.organism_classification, fleuve Ouémé, Benthic zone, Sustainable management, Environmental science, Sciences Humaines et Sociales, Sample collection, Water quality, macroinvertébrés, Ouémé River
Abstract

To cope with the numerous consequences of stream pollution caused by anthropogenic activities, it is necessary to evaluate the water quality for sustainable management. The present study aims to evaluate the water quality of the upper reaches of the Ouémé River in Benin using biotic indices based on benthic macroinvertebrates. Macroinvertebrates were sampled using a Surber net in four stations distributed over the longitudinal profile of the upper reaches of the Ouémé River. After sample collection, the macroinvertebrates were separated, identified and counted under a stereo-microscope. A total of 13 macroinvertebrate orders and 24 macroinvertebrate families were collected in this study. The Chironomidae was the most abundant family. The results of the Ephemeroptera, Plecoptera, Trichoptera (EPT) Index, the EPT/Chironomidae Index, the Hilsenhoff Index and the Standardized Global Biological Index (IBGN) revealed that the Upper Ouémé River has very poor water quality. The intense pressures from human activities in this part of the river have led to serious organic pollution, which has resulted in the proliferation of macroinvertebrates resistant to pollution to the detriment of those sensitive to pollution. On the basis of this result, protection and recovery measures must be taken to preserve and improve the ecological status of the waters of the upper reaches of the Ouémé River., Face aux innombrables conséquences de la pollution des cours d’eau par les activités anthropiques, il est nécessaire d’évaluer leur qualité pour une gestion durable. La présente étude vise à évaluer la qualité de l’eau de la partie supérieure du fleuve Ouémé au Bénin à l’aide d’indices biotiques. Au moyen d’un filet Surber, les macroinvertébrés ont été échantillonnés dans quatre stations réparties sur le profil longitudinal de la partie supérieure du fleuve Ouémé. Après la collecte, les macroinvertébrés ont été triés, identifiés et comptés sous une loupe. Au total, 13 ordres et 24 familles de macroinvertébrés ont été capturés dans cette étude. La famille des Chironomidae était la plus abondante. Les résultats de l’indice EPT (éphéméroptères, plécoptères, trichoptères), de l’indice EPT/Chironomidae, de l’indice Hilsenhoff et de l’Indice biologique global normalisé (IBGN) ont révélé que les eaux de la partie supérieure du fleuve Ouémé sont d’une très mauvaise qualité. Les intenses activités humaines dans cette partie du fleuve Ouémé ont entrainé une pollution organique grave, qui a pour conséquence une prolifération des macroinvertébrés polluo-résistants au détriment des polluo-sensibles. Partant de ce fait, des mesures de protection et de récupération doivent être prises afin de préserver et d'améliorer l'état écologique des eaux de la partie supérieure du fleuve Ouémé.

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