#fish fauna

Based on the importance and crucial role in biosphere, studying fish is a debatable issue. Among animal research its study is as prominent as bright day light. Biodiversity refers to the number of different species living in an ecosystem. The current study was carried out from May 2016 to August 2016 to find out Ichthyofauna of Garhi Usmani Khel Stream and Meherdy Stream at Dargai District Malakand, Khyber Pakhtunkhwa Pakistan. The fish specimens were then identified by studying various morphometric measurements and meristic counts. This study included eight species; Barilius pakistanicus, Puntius chola, Channa punctata, Channa gachua, Acanthocobitis botia, Crossocheilus diplocheilus, Mastacembelus armatus and Ompok pabda belonging to four orders (Cypriniformes, Channiformes, Mastacembeliformes, Siluriformes) and five Families (Cyprinidae, Channidae, Nemacheilidaeidae, Mastacembelidae, Siluridae). Cyprinidae was the most dominant family comprised of three species; Barilius pakistanicus, Puntius chola and Crossocheilus diplocheilus. The family Channidae included two species i.e. Channa punctate and Channa gachua while Nemacheilidaeidae, Mastacembelidae and Siluridae were represented by only one species each, Acanthocobitis botia, Mastacembelus armatus and Ompok pabda respectively. It was concluded that Ompok pabda is strictly endangered in River Swat and especially in Garhi Usmani Khel Stream and Meherdy Stream. It is strongly recommended to conserve this species (Ompok pabda).

The present study aims at contributing to a better understanding of Lake Ahémé and its surroundings together with its channels through an update of its fish fauna. The study covers twelve months, from May 2016 to April 2017. Fish specimens which were examined were collected from catches by fishermen as well as from monthly experimental fishing at 19 stations. A total of 73 fish species belonging to 59 genera and 38 families were identified. The Gobiidae family is the most represented with 6 species; the Carangidae and Cichlidae families are next, with 5 species each; then comes the Clupeidae with 4 species; and the Eleotridae, Clariidae, and Lutjanidae families with 3 species each. Strictly estuarine species (E) dominate the population and account for 87.7% of the total species richness

Trophic diversity and ecological balance of fish fauna were studied in three lakes of Côte d’Ivoire, which present different characteristics, in order to assess their maturity state. Fishes were sampled every 45 days from November 2017 to October 2018, using gillnets. Stomachs contents were examined under binocular loop and optic microscope. Prey was quantified using Main Food Index. Fish classification in trophic guilds was based on analysis of 2892 stomach contents belonging to 43 species. Similarity of patterns was summarized by a non-metric Multi-dimensional Scaling analysis and tested statistically by a Permutational multivariate analysis of variance. Forage to carnivore ratio was calculated to assess ecological balance of fish community. Six trophic guilds were recorded: pisciviores, insectivores, molluscivores, herbivores, phytoplanktivores and omnivores. Molluscivores guild was exclusive to Taabo lake. According to specific richness and abundance, insectivores were the most important in three lakes. Fish community is unbalanced at Kossou and Taabo lakes. That of Faé is balanced and suitable. Kossou, Taabo and Faé lakes are aging ecosystems with fish communities subject to anthropic pressure. It could be recommend lowering fishing pressure, precisely in Kossou and Taabo lakes. Obtained results may help decision-making in favor of rational management of lacustrine fisheries.