Age, length-weight relationships and condition factors of endemic Antalya barb Capoeta antalyensis (Battalgil, 1943)

The aim of this study was to determine the length-weight, length-length relationships (LWR and LLR) and condition factors of Antalya barb Capoeta antalyensis, an endemic species to Turkey. The specimens (N = 125) were caught using the gill nets in the Sorgun Dam (Aksu, Isparta). The age of the study specimens varied between one and six years. The total length and body weight of the specimens varied from 17.7 – 36.7 cm and 57.03 – 526.91 g respectively. A negative allometric growth (b = 2.7743) was recorded for the species whereas the LWR and total length (TL) – fork length (FL) equations were W = 0.0203 × TL2.7743 (R2 = 0.95) and TL = 0.402 + FL × 1.061 (R2 = 0.99) respectively. The condition factor was determined for every specimen. In light of the results obtained in the study this species may be considered for aquaculture ensuring sustainable population in the wild. This study provides new information that can play an important role in the sustainable management this species

Electric fish barrier for protecting small carps in Eğirdir lake

Sitna riba od ekonomske vrijednosti u jezeru Eğirdir, četvrtom po veličini u Turskoj, ubija se električnim vodenim pumpama koje se koriste za navodnjavanje i vodu za piće. U ovom je radu konstruirana električna barijera koja ribu drži dalje od crpilišta električnih vodenih pumpi. Rezultati su provjeravani u laboratorijskim uvjetima. Svaki je eksperiment ponovljen tri puta s 30 riba (odnosno, ukupan broj riba za svaki eksperiment bio je 90). Rezultati su se provjeravali analizom varijance (ANOVA) uz primjenu SPSS programa. Eksperimentalni rezultati su pokazali da se vrijednost 50 V/10 Hz ne može koristiti zbog negativnih učinaka. Kao barijera za ribu odgovarajuće vrijednosti su 20 V/10 Hz i 35 V/10 Hz.Juvenile fishes which have economic value in Eğirdir Lake, the fourth largest lake in Turkey according to its size, are killed due to electric water pumps used for the purpose of irrigation and drinking water. In this study, an electric fish barrier was designed to keep fish away from withdrawal points of electric water pumps. Results were tested in laboratory conditions. Each experiment was performed in triplicate using 30 fish (that is, the total number of fish used for each experiment was 90). Analysis of variance (ANOVA) was used to evaluate the results by using SPSS program. The experimental results demonstrated that the 50 V/10 Hz value cannot be used because of the adverse effects. 20 V/10 Hz and 35 V/10 Hz values are suitable to keep fish away from the barriers

Temperature Effects Explain Continental Scale Distribution of Cyanobacterial Toxins

Insight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their potency. Most studies examine the relationship between individual toxin variants and environmental factors, such as nutrients, temperature and light. In summer 2015, we collected samples across Europe to investigate the effect of nutrient and temperature gradients on the variability of toxin production at a continental scale. Direct and indirect effects of temperature were the main drivers of the spatial distribution in the toxins produced by the cyanobacterial community, the toxin concentrations and toxin quota. Generalized linear models showed that a Toxin Diversity Index (TDI) increased with latitude, while it decreased with water stability. Increases in TDI were explained through a significant increase in toxin variants such as MC-YR, anatoxin and cylindrospermopsin, accompanied by a decreasing presence of MC-LR. While global warming continues, the direct and indirect effects of increased lake temperatures will drive changes in the distribution of cyanobacterial toxins in Europe, potentially promoting selection of a few highly toxic species or strains.Peer reviewe

A Preliminary Study on Zooplankton Species in Different Aquatic Habitats of Anatolia (Turkey)

In this research, a preliminary study on zooplankton species was conducted a total of 7 in the freshwater areas in the Mediterranean, Aegean and Central Anatolia region of Turkey. Zooplankton sampling were collected one-time study between 2002 and 2012 from the study areas. Samples were taken using plankton net Hydrobios with a mesh size of 55 μm and preserved with 4% formaldehyde solution. At the end of the study, a total of 43 species were identified, including 20 species Rotifera, 18 species Cladocera, 5 species Copepoda. Pleuroxus aduncus, Chydorus sphaericus, Bosmina longirostris, Leydigia leydigi, Keratella cochlearis and Asplanchna priodonta were observed as intensive during the study area. All species have been recorded for the first time in this study regions

Variations of Some Growth Characteristics and Length-Length Relationships of Sakarya Bleak (Alburnus esherichii Steindachner, 1897) in Different Habitats

In this study, some growth characteristics and relationships of Sakarya bleak inhabiting different water habitats (dam, pond and creek) in the Bilecik Province of Türkiye were examined. Sample weights ranged from 0.17 to 111.25 g. Total lengths were measured between 2.70 and 19.80 cm. According to the localities, the b values varied between 2.9469±0.07 and 3.2548±0.03. R2 values were computed between 0.850 and 0.996. The relative condition factor values were similar to each other, while the Fulton’s condition factor values ranged from 0.79±0.01 to 1.29±0.03. The length-weight (LWR) and length-length relationships (LLRs) of samples were examined. According to localities, growth type of the length - weight relationships were either isometric or positive allometric