The impact of fish farming on the water column and marine sediments in three coastal regions from eastern Aegean coast


Kucuksezgin F., PAZI İ., GÖNÜL L. T., KOÇAK F., ERONAT C., SAYIN E., ...More

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, vol.28, no.23, pp.29564-29580, 2021 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 28 Issue: 23
  • Publication Date: 2021
  • Doi Number: 10.1007/s11356-021-12695-2
  • Journal Name: ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, IBZ Online, ABI/INFORM, Aerospace Database, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, CAB Abstracts, EMBASE, Environment Index, Geobase, MEDLINE, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Page Numbers: pp.29564-29580
  • Keywords: Fish farming impact, Sediment quality, Water quality, Eastern Aegean coast
  • Dokuz Eylül University Affiliated: Yes

Abstract

The impacts of mariculture activities in the water and sediments were comprehensively evaluated for the first time in this study. Lower dissolved oxygen was detected near the cages during summer due to aquacultural activities and bacterial degradation of organic compounds. However, DO levels were not below the 5 mg L-1 limit recommended for aquatic growth, survival and metabolic processes. Different eutrophication assessment methods showed that Gulluk Bay, where intensive aquaculture activities occurred, was characterized by poor status. Assessment of different eutrophication tools for Akkoy and Ildir Bay indicated that water quality status was not similar to each other. The most noticeable effect of aquaculture activities is the sedimentation of faeces and uneaten food under the cages. Nutrients in the water indicated gradual decrease with distance from the cages. Comparison of total phosphorus in sediments showed that the most affected area is Gulluk Bay owing to cumulative impact of aquaculture. The higher total organic carbon (TOC) in sediments was measured near and under the cages. TOC was a useful indicator to show benthic health, less than 10 mg g(-1) corresponded to low risk deteriorations for all aquaculture sites. Sediment monitoring studies should be carried out to provide sustainable use of the aquaculture areas.