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Assessing the mercury content of fishes (Sarotherodon melanotheron and Chrysichthys nigrodigitatus), shrimps (Penaeus spp), and oysters (Crassostrea gasar) of complex “lake Nokoué -lagoon of Porto-Novo” in the Republic of Benin (West Africa)

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Author Affiliations

  • 1Laboratoire des sciences et Techniques de l’Eau (LSTE) Institut National de l’Eau (INE), Université d’Abomey-Calavi, Benin and Laboratoire de Surveillance Environnementale Ministère Cadre de Vie et du Développement Durable, Benin
  • 2Laboratoire des sciences et Techniques de l’Eau (LSTE) Institut National de l’Eau (INE), Université d’Abomey-Calavi, Benin and Laboratoire d’Ecologie Appliquée, Faculté des Sciences Agronomiques. Université d’Abomey Calavi, Benin
  • 3Laboratoire des sciences et Techniques de l’Eau (LSTE) Institut National de l’Eau (INE), Université d’Abomey-Calavi, Benin and Laboratoire de Surveillance Environnementale Ministère Cadre de Vie et du Développement Durable, Benin
  • 4Laboratoire de Surveillance Environnementale Ministère Cadre de Vie et du Développement Durable, Benin
  • 5Laboratoire des sciences et Techniques de l’Eau (LSTE) Institut National de l’Eau (INE), Université d’Abomey-Calavi, Benin and Laboratoire de Surveillance Environnementale Ministère Cadre de Vie et du Développement Durable, Benin

Res. J. Animal, Veterinary and Fishery Sci., Volume 10, Issue (1), Pages 1-8, May,24 (2022)

Abstract

By ratifying the Minamata Convention related to mercury, the Republic of Benin committed itself to assess the metal pollution sites within the country. Aquatic mercury pollution represents a potential health threat to the population whose protein source is the fish from the water bodies across the country. Lake Nokoue-Lagoon of Porto-Novo complex represents the most important fish provider in West Africa. But this watershed is contaminated by mercury. The present study aims at investigating the mercury content of the most consumed fish, shrimp and oysters. Samples of sarotherodon melanotheron, Chrysichthys nigrodigitatus, shrimps (Penaeus spp), and oysters (Crassostrea gasar) were taken at different fishing sites of the complex and different period of the year. The mercury content of the samples was determined by the Direct Mercury Analyzer 80. Its turns out that 1.87 to 239 µg/kg wet weight with an average of 21.08 ± 21.62 µg/kg wet weight was found in C. nigrodigitatus, 0.48 to 49.81 µg/kg wet weight in S. melanotheron with an average of 6.84 ± 5.21 µg/kg wet weight; 0.84 to 17.17 µg/kg wet weight in penaeus spp shrimp, 4.46 to 8.98 µg/kg wet weight in C. gasar oyster. Those values even though well below the Benin Republic standards for non-predatory fish are above the Canadian standards and twofold the Check Republic ones. However, spatial distribution study of mercury in fishery products and health risk assessment needs to be undertaken to guide decision makers.

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