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Articles by Deniz Ayas
Total Records ( 2 ) for Deniz Ayas
  Deniz Ayas , Deniz Erguden , Sibel Alagoz Erguden and Hasan Deniz Akbora
  Background and Objectives: Alopias vulpinus is one of the common large sharks recorded in various regions of the Mediterranean Sea. The objective of the present study was the first confirmed reports of the young and pregnant female A. vulpinus specimen with newborn four individuals first time photographed in the Northeastern Mediterranean coast of Turkey. Materials and Methods: On 09 March 2019, a young specimen of Alopias vulpinus with a total length (TL) of 2.5 m TL and 180 kg was captured by longline at a depth around 38 m off the Erdemli coast. Another specimen, which was a pregnant female caught (5.5 m and weight 400 kg) by a trammel net at a depth of 30 m in the vicinity of Taşucu (North-Eastern Mediterranean, Turkey) on 11 March, 2019. Results: This ichthyologic note presents a pregnant female and juvenile records of A. vulpinus for Mersin Bay, Mediterranean coast of Turkey. Measurements of the specimens given and the previous records information and geographical distribution of the sample of A. vulpinus in the Turkish Mediterranean waters were documented. Although, A. vulpinus has been distributed in the Mediterranean Sea coast of Turkey and reported from the eastern Mediterranean. Conclusion: If the necessary precautions are not taken, this species may be considered as “Endangered" in the Turkish Mediterranean waters soon. Thus, the required legal arrangements for the protection of these species in the region should be given priority.
  Hilal Kargin Yilmaz , Deniz Ayas and Harun Yilmaz
  Spirulina platensis, cyanobacteria was cultivated in a helical photobioreactor and in a continuous system. Cultivation continued at different salinity ratios (10, 20, 30%) for 10 days. The total volume of the photobioreactor was 24.3 L comprising of 18 L nutrition medium and 6.3 L algae. Each day, the system yielded 10 L of algae and 10 L of nutrition medium was added into the system. At the end of 10 day experiment, the medium reached to1.042x107 filament L-1 from an initial filament density of 7.596x106 filament L-1 at 10% salinity, 7.409x106 filament L-1 from an initial filament density of 7.60x106 filament L-1 at 20% salinity and to 7.381x106 filament L-1 from an initial filament density of 7.62x106 filament L-1 at 30% salinity. Variations in proximate composition of S. platensis occurred due to the different rates of salinity. Carbohydrate, TMS (Total Mineral Substance) and lipid values increased; protein levels decreased in parallel with the increase in salinity. A reduction of approximately 13.05% occurred in the protein values, 26.08% increase in the lipid value, 31.85% increase in TMS and 9.86% increase in carbohydrate values were observed.
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