Abstract. In this study, the seasonal succession of the diatoms on Phragmites australis community was investigated in Lake Mogan (Turkey), and the epiphytic diatom community was used to estimate the ecological condition of the lake. Five stations were chosen in the littoral region of the lake, and diatom samples were taken from the P. australis monthly between January and November 2013. Two stations were selected in the pelagial region and chlorophyll a concentrations were determined. Lake water temperature, pH, dissolved oxygen concentration, conductivity and Secchi depths were measured, and total nitrogen, total phosphorus and silicate were analyzed. A total of 61 epiphytic diatom species were identified in Lake Mogan. The dominant species were those with tolerance to α-β mesosaprobic conditions. According to the mean Secchi depth, chlorophyll and total phosphorus concentrations, the lake was eutrophic. The IDG, IPS, DESCY, WAT, IDP and TDI indices, calculated according to epiphytic diatoms, indicated an ecological quality between medium and poor (classes III-IV). Among them, IDG and IPS are recommended for monitoring of ecological status in the lake because these indices also integrated all diatom taxa within the samples. The occurrence of pollution-tolerant species and the fact that most indices showed an ecological quality of medium or poor indicated an increase of organic matter and eutrophication in Lake Mogan.
As from January 2010 The Israeli Journal of Aquaculture-Bamidgeh (IJA) will be published exclusively as an on-line Open Access (OA) quarterly accessible by all AquacultureHub (http://www.aquaculturehub.org) members and registered individuals and institutions. Please visit our website (http://siamb.org.il) for free registration form, further information and instructions. This transformation from a subscription printed version to an on-line OA journal, aims at supporting the concept that scientific peer-reviewed publications should be made available to all, including those with limited resources. The OA IJA does not enforce author or subscription fees and will endeavor to obtain alternative sources of income to support this policy for as long as possible.
The present study aimed to contribute to the algal flora of Turkey by Bacillariophyta (diatom) as new records for the Turkish freshwater algal flora. Phytobenthos and phytoplankton were sampled three times (spring, summer, and autumn) a year between 2017 and 2019. Samples of the phytoplankton were collected with a water sampler from three depths, and samples of diatoms were obtained as epiphytic in the littoral zone of the lakes. However, if macrophytes were absent, epilithic or epipelic diatoms were sampled in lakes. Also, samples of phytobenthos were preferred as epilithic in rivers. However, if stones were absent, epiphytic or epipelic diatoms were sampled. During the studied period, a total of 895 diatom taxa were determined as planktonic (378 taxa) and benthic (860 taxa) in lakes and rivers of 25 river basins of Turkey, and a total of 44 new records were identified. The highest diatom taxa were determined in the Fırat-Dicle, Konya, Antalya, and Büyük Menderes basins with 13, 12, 10, and 7 taxa, respectively. On the other hand, new records were not detected in 10 basins.
Marine and freshwater aquaculture in Turkey have grown substantially. The first trout farm was established in the 1960s and the first marine cage farm for sea bream and sea bass in 1985. From the beginning of the 1970s to 1999 the number of licensed fish farms increased from two to 1,444. Since 1995, the number of cage farms has grown to 57 and production reached 4,100 tons in 1999. Total aquaculture production grew from 3,075 tons in 1986 to 63,000 tons in 1999. Production is dominated by inland production, mainly of trout (Oncorhynchus mykiss), which supplies 60% of the total. From 1995 to 1999, marine production increased from 8,494 tons to 25,230 tons. The major contributors are sea bream (Sparus aurata) and sea bass (Dicentrarchus labrax). Because of the rel- atively high temperatures in the Black Sea, Atlantic salmon (Salmo salar), cultured from the late 1980s to 1997, is no longer grown; only rainbow trout (O. mykiss) in floating net cages is produced. Because of the growing demand caused by increased population and export, aquaculture pro- duction and consumption in Turkey are expected to grow. New fish and shellfish species, mainly marine, are being developed. The bureaucracy involved in licensing fish farms, especially in marine environments, is complicated, time-consuming, and suffers from a lack of technical knowl- edge and insufficient exchange of know-how and cooperation concerning new developments. * Corresponding author. Present address: Istanbul Universitesi, Su Ürünleri Fakültesi, 34470 Laleli, Istanbul, Turkey; e-mail: mdevrim@istanbul.edu.tr
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