POTENTIAL ENVIRONMENTAL IMPACTS OF TUNA CAGE FARMING IN THE AEGEAN SEA

Rıdvan Kaan Gürses; Yeşim Büyükateş; Murat Yiğit; Sebahattin Ergün; A. Suat Ateş; H. Göksel Özdilek

doi:10.3153/AR19008

EN

POTENTIAL ENVIRONMENTAL IMPACTS OF TUNA CAGE FARMING IN THE AEGEAN SEA

Abstract

The present study aimed to investigate the potential impacts of Atlantic Bluefin Tuna (Thunnus thynnus) farming in offshore cage systems in the Aegean Sea (Sığacık Bay-Izmir, Turkey), in respect to 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 an unaffected 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 acceptable limits 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 both cage 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 general quality criteria of 30 mg/L for marine environment. No eutrophication risk (TRIX index, T<4) was observed 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 the Tuna Cage Farm were not significant, possibly due to the consistent movement of the water in currents in the study area.

Keywords

Tuna farming,Cage aquaculture,Environmental impact,Water quality

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Details

Primary Language

English

Subjects

Hydrobiology , Maritime Engineering

Journal Section

Research Article

Authors

Rıdvan Kaan Gürses
0000-0001-5951-2308
Türkiye

Yeşim Büyükateş ^*
0000-0002-4402-4587
Türkiye

Murat Yiğit
0000-0001-8086-9125
Türkiye

Sebahattin Ergün
0000-0002-9077-9438
Türkiye

A. Suat Ateş
0000-0002-4682-1926
Türkiye

H. Göksel Özdilek
0000-0001-9740-9758
Türkiye

Publication Date

April 1, 2019

Submission Date

February 18, 2019

Acceptance Date

March 20, 2019

Published in Issue

Year 2019 Volume: 2 Number: 2

DOI

https://doi.org/10.3153/AR19008

IZ

https://izlik.org/JA32GC99GD

Cite

RIS / Bibtex

APA

Gürses, R. K., Büyükateş, Y., Yiğit, M., Ergün, S., Ateş, A. S., & Özdilek, H. G. (2019). POTENTIAL ENVIRONMENTAL IMPACTS OF TUNA CAGE FARMING IN THE AEGEAN SEA. Aquatic Research, 2(2), 61-72. https://doi.org/10.3153/AR19008