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    Assessment of physical carrying capacity of a mariculture zone designated in the Aegean Sea
    (Springer, 2024) Yiğit, Murat; Ergün, Sebahattin; Büyükateş, Yeşim; Ateş, A. Suat; Özdilek, H. Göksel; Acar, Seçil
    The present study was conducted to evaluate the physical carrying capacity in a mariculture zone designated for cage aquaculture in the Aegean Sea (Mersin Bay, Izmir, Turkiye). Rapid assessment of carrying capacity for the approval of new investments or capacity increase requests environment-regulated timely management procedures for the sustainable development of the drastically growing cage aquaculture industry in the Mediterranean. Hence, the mathematical estimations earlier developed for the Mediterranean area have been applied for the carrying capacity assessment using the data gathered from eight fish farms operating in the area. The data collected from the farms comprised the information such as current granted production level, surface area, location depth, current speed, shore distance, and coordinates of the farm sites. The results obtained showed an estimated carrying capacity for the investigated mariculture zone as 252,852 tons which is about 18 times the current production level of 13,500 tons that was granted in total for the sum of eight cage farms in the region with a total of 50.89-ha surface area. It can be concluded that, with the condition of periodic environmental monitoring to keep the marine ecosystem below eutrophication risk, the production capacity of farms in the designated mariculture zone, comprising a surface area of 50.89 ha, could be increased by 18-fold over the present production level, which is far below the risk threshold. The findings of this study provide important support for decision-makers in the management of intensive cage aquaculture operations in the Mediterranean region.
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    Öğe
    POTENTIAL ENVIRONMENTAL IMPACTS OF TUNA CAGE FARMING IN THE AEGEAN SEA
    (2019) Gürses, Rıdvan Kaan; Büyükateş, Yeşim; Yiğit, Murat; Ergün, Sebahattin; Özdilek, H. Göksel
    The present study aimed to investigate the potential impacts of Atlantic Bluefin Tuna (Thunnusthynnus) farming in offshore cage systems in the Aegean Sea (Sığacık Bay-Izmir, Turkey), in respectto physico-chemical water quality parameters, nutrient loads, chlorophyll-a, total suspended solids,zooplankton groups, and TRIX index calculations for the potentially affected cage farm area and anunaffected reference site. Concentrations of physico-chemical variables (temperature, salinity, dissolved oxygen, pH) in the study carried out in May and August 2018, were within the acceptablelimits for marine aquaculture in terms of water quality characteristics. The concentrations of PO4-P,NH4-N, and NO2-N showed no temporal or spatial changes, and were recorded below 0.01 mg/L(<0.01) for PO4-P and NH4-N, whereas lower than 0.005 mg/L (<0.005) for NO2-N values in bothcage and reference stations in May and August 2018 periods. Results showed low levels of TSS(0.33-11.87 mg/L), both in the cage farm area and the reference site, remaining below the generalquality criteria of 30 mg/L for marine environment. No eutrophication risk (TRIX index, T<4) wasobserved around the Tuna Cage Farm Site in Sığacık Bay, according to the legislations enacted for“Sensitive Areas of Enclosed Bays where fish farms are not allowed”. Based on these findings,demonstrating highly interactive trophic level variability, it can be concluded that the impacts of theTuna Cage Farm were not significant, possibly due to the consistent movement of the water in currents in the study area.