International Journal of Limnology

Pearl mullet is an endemic fish species living in the Van Lake Basin. Furthermore, it is an important species for both the region and Turkey, as it is the most caught fish in inland waters. Therefore, the sustainability of fishing is of utmost importance in terms of fisheries management. This study aimed to determine the the selectivity of multifilament trammel nets in pearl mullet, Alburnus tarichi (Güldenstädt, 1814), fishing in Lake Van. In line with this objective, the multifilament trammel nets with the mesh sizes of 20, 22 and 24 mm were tested. The “SELECT” method was applied to determine the selectivity parameters. According the results, the lengths of the optimum catching using nets with 20, 22 and 24 mm mesh sizes were calculated as 20.76 cm, 22.07 cm and 24.11 cm, respectively. The highest average CPUE in weight was found to be 24 mm (6.007 kg / 100 m / day). Considering the data obtained in the present study, in pearl mullet fishing, the best optimum catch length and CPUE values were determined in multifilament trammel nets with 24 mm mesh size. In conclusion, the present study suggests that the use of 24 mm mesh size in Lake for pearl mullet fishing will be more beneficial in terms of both fish stocks and the local fishermen.

This study was estimated the correlations between various physicochemical parameters, phytoplankton species, different indices, and to evaluate the ecological status of the lentic systems in the Eastern Mediterranean River basin in Turkey.

Microalgae taxa can be identified with short DNA barcodes. Eight primer pairs for 16S and five for 23S were tested in silico and with mock communities including cyanobacteria and eukaryotic microalgae. We conclude that the 23S primer pair ECLA23S_F1/ECLA23S_R1 was the best candidate to decipher freshwater phytoplankton communities.

There are many types of small waters in the Balkans. They are habitats for Chironomidae. Mountain rheocrenes are inhabited by cold-adapted midges. The fauna of springs in the river valleys is diverse. Midges living in the Skodra L.’ spring system prefer higher water temperatures and hard substrates.

Chlorella vulgaris and Raphidocelis subcapitata, were exposed to different concentrations of ABS microplastics during 6 days. We observed physiological changes in cell growth and chlorophyll content in response to the concentration and duration of exposure.

Effects of E. densa on the the growth and morphology of C. vulgaris with gradient algal density were investigated. The study might provide further insights and knowledge into the interspecific interaction in freshwater ecosystems.

This study provides information on the structure and composition of the egg bank of a shallow lake and the effect of biotic factors on hatching rates. The results show the dominance of rotifers over cladocerans and copepods and a positive effect of certain biotic factors on hatching.

In this study, the geothermal water (GW) was replaced with 25% (GW25), 50% (GW50), 75% (GW75) and 100% (GW100) of the volume of the Schlösser culture medium (SM). The biomass concentration was determined to the higher in the GW50 (1.324 g/L) than in other groups (GW25, GW75, GW100 and SM). The highest protein content and phycocyanin purity ratio were found in the GW75 medium containing 116.6 times higher phosphate than the SM. The chlorophyll, phycocyanin, protein, dry biomass, mineral and amino acid in groups prepared by mixing Schlösser medium and geothermal water mix (GW25, GW50 and GW75) were better than geothermal water (GW100) and the SM. It is concluded that using partial geothermal water in Spirulina production is efficient considering the parameters, i.e., biomass yield, protein, mineral and chlorophyll contents, and also return of investment.

Thirteen ostracods reported for the first time from Lake Karamurat exhibited clear habitat preferences and seasonal occurrences. CCA results explained about 91% of correlation between species and environmental variables. The Pseudorichness Ratio of the lake was very low (Pr=0.25), indicating dominancy of cosmopolitan species over noncosmopolitans.