The big-scale sand smelt, Atherina boyeri, is recorded from the Devegecidi Dam Lake in 2016, the first record of this invasive species in the Tigris River basin, with potential to extend to all countries in the Middle East. The smelts were caught with a trawl net mesh size of 6 mm. The captured specimens are described and compared. Records of A. boyeri from Turkish inland waters are summarised from the literature.

In this study, a total of 82 (49♀♀, 33♂♂) Cyprinion kais samples from the same location in the river of Tigris were collected and ages of scales taken from front and upper section of lin lateral of dorsal fins of fishes were determined and photographed by an Olympus digital camera with Canon SX7 model binocular under the same conditions and then six landmarks were taken by using tpsDig ver. 2.32 software. Afterwards, procrustes analysis was conducted. After separating shapes and sizes, ANOVA, PCA, CVA/MANOVA and DFA analyses were performed. According to the results of the analyses, there was a significant difference between the samples in terms of gender and size (Size ANOVA: F= 50.6, p<.0001); at the same time the difference between samples in terms of shape was at the level of (Shape ANOVA: F= 3.92, p =0.0002); there was a significant difference between samples at different ages in terms of size (Size ANOVA: F= 44.08, p<.0001), however, no difference was found in terms of the shape of the samples; there was a significant difference between size (Size ANOVA: F= 17.87, p<.0001) of the samples but no difference was found between shape of them depending on the season. For gender, age and seasons, the first two components explain 61.4%, 63.6% and 63.4% of total variance, respectively. As a result, there was a difference between sizes of the C. kais species depending on gender, age of the fishes and the season; however, although there was a difference between shapes of the samples depending on gender variable, no difference was found depending on age of the fish and the season.

In this study, a totally 103 (53♀♀, 50♂♂) C. trutta and 82 (67♀♀, 15♂♂) C. umbla samples from the Tigris River between Ilısı Dam and Cizre town were collected and ages of scales taken from front and upper section of line lateral of dorsal fins of fishes were determined and one scale from each fish sample photographed by an Olympus digital camera with Canon SX7 model binocular under the same conditions with 40X magnification and then six landmarks were taken by tpsDig. After GPA (General Procrustes Analysis) performed, ANOVA (Analysis of Variance), PCA (Principal Component Analysis), CVA (Canonical Variance Anlysis) and DFA (Discriminant Function Analysis) analysis were conducted by MorphoJ and PAST. In CV (Canonical Variance) Analysis, the permutation p-value of the mahalanobis and procrustes distance between the two species (p<.0001) shows that the difference is quite significant. As a result of the reclassification done by the analysis, we see that 79% of C. umbla and 77% of C. trutta are classified correctly.

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In this study, the shape and size differences between 30 samples of Garra rufa and Garra variabilis species captured in Tigris River were investigated by using geometric morphometric methods. According to the results of this study, there is no difference between these two species in terms of size (CS); however, they are quite different from each other in terms of shape and this difference is significant (CVA/MANOVA; Pillai tr. Shape procrustes ANOVA ; F=16.40,). These differences are thought to be caused by feeding habits and habitat structure.