The diet of Hemichromis fasciatus (Perciformes, Cichlidae) was studied in the lake dam of Ayame 2 (Côte d'Ivoire) from September 2015 to August 2016. A total of 141 specimens were captured using gill nets and hawks. The relative importance of food index has been calculated to assess the relative abundance of the preys. The standard length of fish varied between 70 mm and 250 mm. The global percentage of emptiness and intestinal coefficient mean were 23.40 % and 1.35 ± 0.48 respectively. The food spectra constituted of fishes, insects, arachnids and plants debris showing that this species is an omnivorous fish with predatory fish tendency. The comparison of the food habits between size ranges (LS ≤ 110 mm and LS ˃ 110 mm) did not show any significant difference. But, a significant variation of the diet according the sexes and seasons was observed.

No abstract

In this study the ecto and endoparasites infecting Sarotherodon melanotheron were investigated in Ebrie Lagoon between February 2019 and November 2019. A total of 108 randomly sampled Sarotherodon melanotheron was procured from fishermen and examined for parasites using standard parasitological methods. The parasites such as Monogenean Cichlidogyrus halinus, C. halli, C. acerbus and Scutogyrus minus), Myxosporea (Myxobolus beninensis, M. diamensis, M. nokouensis and M. sarotherodoni), Copepod (Ergasilus latus and E. sp), Acanthocephalan (Acanthogyrus tilapiae), Nematode (Eustrongylides sp) and the Trematoda (Clinostomum tilapiae and Euclinostomum heterostomum) were recorded. Gill and intestine were respectively the more and the least infected organ by parasites. The intensity of Monogenean, Copepod and Acanthocephalan were positively increased with host body size. In Contrast, the intensity of Myxosporean, Nematode and Trematode did not increase with host standard length. Monogenean and Copepod were more concentrated in male hosts and Myxosporean in female fish. However, no influence of host sex on parasitism level was observed for population of Acanthocephalan, Nematode and Trematode. This could enable the use of appropriate methods to fight against these pathogens, especially in intensive fish farming.

Fish species composition and organization of the Bandama River at the scientific nature reserve of Lamto have been investigated for the first time. The study was conducted from March 2021 to February 2022. Gillnets and traps were used to collect fish. A total of 41 species belonging to 35 genera, 13 families, and 5 orders were captured. The best-represented orders were the Siluriformes with 5 families and 11 species and the Perciformes with 3 families and 14 species of fish. The Cichlidae, Mormyridae, and Alestidae represented the best diversified family with 13, 5, and 5 species respectively. This study also showed a decrease in the average size of individuals of the main species retained, which could reflect overexploitation of the stocks. The Shannon index (2.21 bits/ind.) and equitability (0.58) values obtained reflect a more or less distribution of individuals by species. These results will make it possible to establish a database for the conservation of this fish population and its habitat.

The Nile tilapia, Oreochromis niloticus is a fast growing fish and has a great importance for fisheries, aquaculture, and screen aquarium in Côte d’Ivoire. Parasitic infections constitute significant economic loss in fish production. The work based on Epidemiology of gill Monogenean parasites of O. niloticus from the Agneby River between August to December 2020, for the first time, was aimed to characterize the physicochemical parameters of this River, to inventory the gill Monogenean species in Nile tilapia, to analyze the parasitism as a function study areas and to highlight the parasite species’ distribution on the gill. A total of 102 specimens of fishes was sampled and examined for parasites. Gill helminthofauna of this fish consisted of Cichlidogyrus cirratus, C. tilapiae, C. halli and Scutogyrus longicornis. Fishes of the Agneby River at Agboville are more infested than the other ones due to environmental conditions. The examination of the two sides of the fish revealed that parasites species have the same affinity for the both sides of the fish. In contrast, at the level of the gill arch, these parasites preferred median gill arches (arches II and III).