AQUATIC SCIENCES and ENGINEERING VOLUME: 34 ISSUE: 4 2019 E-ISSN 2602-473X AQUATIC SCIENCES and ENGINEERING OWNER OF JOURNAL INTERNATIONAL EDITORIAL BOARD İstanbul University Faculty of Aquatic Sciences Prof. Genario Belmonte University of Salento, Italy EDITOR IN CHIEF Prof. Carsten Harms Prof. Devrim Memiş Applied University Bremerhaven, Germany İstanbul University Faculty of Aquatic Sciences, Turkey Prof. Konstantinos Kormas University of Thessaly, Greece DEAN Prof. Sergi Sabater Prof. Dr. Meriç Albay Institute of Aquatic Ecology, Spain Prof. Maya Petrova Stoyneva-Gaertner CO EDITOR IN CHIEF Sofia University “St Kliment Ohridski”, Bulgaria Prof. Özkan Özden Prof. Nuray Erkan İstanbul University Faculty of Aquatic Sciences, Turkey İstanbul University Faculty of Aquatic Sciences, Turkey LANGUAGE EDITOR Prof. Reyhan Akçaalan İstanbul University Faculty of Aquatic Sciences, Turkey Joanne Bates Department of Foreign Languages, İstanbul University, Prof. Saadet Karakulak İstanbul, Turkey İstanbul University Faculty of Aquatic Sciences, Turkey Assoc. Prof. Lukas Kalous Czech COVER PHOTO University of Life Sciences, Czech Prof. Dr. Melek İşinibilir Okyar Dr. Klaus Kohlmann E-mail: [email protected] Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Germany İstanbul University Faculty of Aquatic Sciences, Turkey Dr. Piero Addis University of Cagliari, Italy Dr. Nico Salmaso Research and Innovation Centre, Italy Dr. Petra Viser University of Amsterdam, Netherlands Publisher Copyright © 2019 İstanbul University Press Journal Adress: İstanbul University Faculty Aquatic Sciences, Ordu Caddesi No:8 34134 Laleli Fatih/İstanbul Turkey E-mail: [email protected] for submussion instructions, subcription and all other information visit http://dergipark.org.tr/ase I AQUATIC SCIENCES and ENGINEERING Aims and Scope Aquatic Sciences and Engineering is an international, Analytics Web of Science Emerging Sources Citation Index scientific, open access periodical published in accordance with (ESCI), Clarivate Analytics Zoological Record, Biological indepen¬dent, unbiased, and double-blinded peer-review Abstracts, BIOSIS Previews, TUBITAK ULAKBIM TR Index and principles. The journal is the official publication of İstanbul CAB Abstracts. University Faculty of Aquatic Sciences and it is published quarterly on January, April, July, and October. The publication Processing and publication are free of charge with the journal. language of the journal is English and continues publication No fees are requested from the authors at any point throughout since 1987. the evaluation and publication process. All manuscripts must be submitted via the online submission system, which is available Aquatic Sciences and Engineering aims to contribute to the at https://dergipark.org.tr/ase. The journal guidelines, technical literature by publishing manuscripts at the highest scientific level information, and the required forms are available on the on all fields of aquatic sciences. The journal publishes original journal’s web page. research and review articles that are prepared in accordance with the ethical guidelines. 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Phone: +90 212 4555700/16448 Fax: +90 212 5140379 Aquatic Sciences and Engineering is indexed in Clarivate E-mail: [email protected] II AQUATIC SCIENCES and ENGINEERING Contents/İçindekiler 103 Research Article • A Preliminary Study on Using Rotifera Fauna to Determine The Trophic Level of The Büyükçekmece Reservoir (İstanbul, Turkey) Zeynep Dorak 112 Research Article • The Characterization and Activity of Protease Enzyme on Different Days of Tadpoles [Pelophylax ridibundus (Pallas, 1771)] Hülya Şereflişan, Ahmet Alkaya, Kaya Gökçek 116 Research Article • The Effect of Seasons on Gill Net Selectivity Adnan Ayaz, Uğur Altinağaç, Alkan Öztekin, Uğur Özekinci 122 Research Article • Benthic Diatom Composition of Iztuzu Coastal Lake, Dalyan (Aegean Sea, Turkey) Aydın Kaleli 131 Research Article • Nutritional Composition and Fatty Acid Profile of Commercially Important Mullet Species in the Köyceğiz Lagoon Yunus Alparslan, Cansu Metin, Hatice H. Yapıcı, Zerrin Ekşi, Ümran Ateş, Taçnur Baygar III EISSN 2602-473X AQUATIC SCIENCES AND ENGINEERING Aquat Sci Eng 2019; 34(4): 103-111 • DOI: https://doi.org/10.26650/ASE2019586048 Research Article A Preliminary Study on Using Rotifera Fauna to Determine The Trophic Level of The Büyükçekmece Reservoir (İstanbul, Turkey) Zeynep Dorak1 Cite this article as: Dorak, Z. (2019). A preliminary study on using rotifera fauna to determine the trophic level of the Büyükçekmece Reservoir (İstanbul, Turkey). Aquatic Sciences and Engineering, 34(4), 103–111. ABSTRACT In this study, the abundance of rotifera fauna, in the Büyükçekmece Reservoir (İstanbul) and some physicochemical features of the reservoir, were investigated between May 2009 and February 2010. In terms of physicochemical conditions, the trophic state of the reservoir was determined as eutrophic (CTSI= 57.8). A total of 33 rotifera species were identified.Keratella cochlearis repre- sented 40.62% of the total annual rotifera present, and was predominant. It was followed by Poly- arthra vulgaris (10.14%), Synchaeta oblonga (9.06%), Brachionus urceolaris (5.58%), Pompholyx sulcata (5.21%) and Epiphanes macroura (%4.86), respectively. The contribution of the other rotifer species to the annual presence of rotifera was determined as being 24.52%. The dominance of these species was attributed to the eutrophic state of the reservoir, because K. cochlearis, P. vul- garis, B. urceolaris and P. sulcata are known as eutrophication indicator species, due to their sap- robic valences. Also, the trophic state of the reservoir was found to be eutrophic according to the QB/T index (= 3). According to the present data about rotifera species, and the abundance of them, ORCID IDs of the authors: the Büyükçekmece Reservoir was specified as eutrophic. However it is necessary to follow the Z.D. 0000-0003-4782-3082 conditions with periodic monitoring to observe the alterations in the Büyükçekmece Reservoir, in 1Istanbul University, Faculty of this respect the results of the present study would constitute an important baseline for subse- Aquatic Sciences, Department of quent studies. Marine and Freshwater Resources Management, Istanbul, Turkey Keywords: Zooplankton, indicator species, seasonal distribution, water quality, eutrophication Submitted: 03.07.2019 Revision Requested INTRODUCTION food chain in aquatic systems (Brito et al., 2011). 09.08.2019 For this reason, the environmental conditions Rapid population growth and the development Last Revision Received of reservoirs may affect diversity, density, bio- 12.08.2019 of industry has caused an increase in the need mass, and the spatiotemporal distribution of for drinkable tap water. However, usable water the zooplankton. Accepted: resources in Turkey are limited as well as around 18.08.2019 the world. Therefore, many reservoirs have Zooplankton play a critical role in food and en- Online published: been built for the supply of drinking water, irri- ergy cycles in aquatic environments. Zooplank- 16.09.2019 gation, flood control, and energy generation in ton groups grazing on phytoplankton, bacteria Correspondence: Turkey since the 1930s. Due to reservoirs