A three samplings were carried out between September 2014 and August 2015, at twelve stations to determine the seasonal changes of species, relations with water quality parameters, and the Malacostraca fauna of the Upper Coruh River Basin. A hand net was used to collect the biological samples. Dissolved oxygen, temperature, pH, electrical conductivity, and total dissolved solids were measured using a portable water meter. Nitrite, ammonium, phosphate, and biochemical oxygen levels were also measured. Seven taxa were identified (five of them belong to Amphipoda, one to Isopoda, and one to Decapoda). Gammarus birsteini was the continuous, while G. kischineffensis and Asellus aquaticus are common. G. fossarum, G. balcanicus, Gammarus sp. and Potamon ibericum were rarely found. AF (Aydıncık Foundation) and DF (Değirmencik Foundation) stations had first class water quality while other stations had second and third quality according to the Quality Criteria According to Classes of Inland Water Resources.

In this study, Mollusca (Gastropoda, Bivalvia) samples obtained from different distributaries drains the Çoruh River Basin were examined. It was aimed to contribute to the knowledge of mollusc species distribute in inland waters of Turkey. The samples were taken from 21 different locations at different times. At the end of the study, a total of 9 species of Dreissena

In this study, it was aimed to evaluate the water quality of the Çoruh Basin using BMWP (Biological Monitoring Working Party) index, ASPT (Average Score Per Taxon) index, Shannon-Wiener Diversity Index, EPT (Ephemeroptera Plecoptera Trichoptera taxa), EP (Ephemeroptera Plecoptera taxa) index scores and benthic macroinvertebrates. The benthic macroinvertebrates were collected from 54 stations at the Çoruh basin between 2014-2016 years. Standard hand net (D-frame net) and Ekman-Birge grab were used as sampling tools. As a result of the diagnoses, a total of 7246 individuals belonging to Insecta, Crustacea, Mollusca, Oligochaeta and Plathyhelminthes were obtained. It was determined that the most dominant group was Insecta and the rarest group was Plathyhelminthes. It was observed that the BMWP score ranged between 5 and 94, and the lowest and highest number of families detected in the stations were 1 and 18, respectively. It was determined that the Shannon Wiener diversity index value was between 0.54-2.20, therefore the basin streams generally showed moderate pollution. The results of BMWP index show that the basin streams had mostly show 3rd and 4th class water quality and also biodiversity decreases with the deterioration of the riverbed or exposure to pollution.

The aim of this study is to reveal the relationship between Malacostraca species distributed in the eastern Black Sea basin streams and some organic and inorganic pollution parameters. For this purpose, water samples and Malacostraca samples were taken seasonally from 9 stations selected from the basin between 2019–2020. A hand net (D-frame net) was used for biological samples. For the determination temperature, dissolved oxygen, pH parameters were seasonally measured in the field. Measurements for Nitrate, Ammonia, Phosphate were made with spectrophotometer. Metal analyzes in water were performed using Inductively Coupled Plasma Mass Spectrometry. 4 species of Malacostraca have been identified. Environmental parameters and species were evaluated together and it was determined that Asellus aquaticus species was distributed in both clean and partially polluted stations. It has been observed that Potamon ibericum species is sensitive to pollution and prefers clean waters.Gammarus komareki and Gammarus pulex pulex species have been found to tolerate light contamination. In this study, different parameters were examined in the rivers of the eastern Black Sea basin and it was observed that the pollution was low and there were seasonal differences.

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