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Influence of some physico-chemical variables on wild fish richness beneath sea-cage fish farms in the Aegean Sea, Turkey

Published online by Cambridge University Press:  06 November 2020

Okan Akyol ,
Aytaç Özgül ,
F. Ozan Düzbastılar ,
Halil Şen ,
José M. Ortiz de Urbina  and
Tevfik Ceyhan Open the ORCID record for Tevfik Ceyhan [Opens in a new window]
Okan Akyol
Affiliation:
Ege University Faculty of Fisheries, 35100, Bornova, Izmir, Turkey
Aytaç Özgül
Affiliation:
Ege University Faculty of Fisheries, 35100, Bornova, Izmir, Turkey
F. Ozan Düzbastılar
Affiliation:
Ege University Faculty of Fisheries, 35100, Bornova, Izmir, Turkey
Halil Şen
Affiliation:
Ege University Faculty of Fisheries, 35100, Bornova, Izmir, Turkey
José M. Ortiz de Urbina
Affiliation:
Instituto Español de Oceanografía, Fuengirola, Malaga, Spain
Tevfik Ceyhan*
Affiliation:
Ege University Faculty of Fisheries, 35100, Bornova, Izmir, Turkey
*
Author for correspondence: Tevfik Ceyhan, E-mail: tevfik.ceyhan@ege.edu.tr
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Abstract

This study aims to determine the relationship between physico-chemical variables on a seasonal basis and wild fish assemblages beneath sea-cage fish farms. Assemblages of wild fish were counted monthly on two separate days at each of six fish farms between August 2015 and July 2017, by six rapid visual counts (RVC) in 5 minutes with scuba by two divers. Seawater samples were simultaneously taken by a Nansen bottle during the RVC from the fish farm barge. SST (°C), salinity (ppm), dissolved oxygen (mg l−1) and pH were measured by YSI multiparameter, while Secchi disk was also used for light transmittance. Wild fish species richness went up with increasing temperature and salinity in the Izmir region, however, this stopped at about 26°C and about 39 ppm. Wild fish richness increased when the DO was at a level of 7 mg l−1 and the pH at about 7.9 in Izmir. Between 10 and 20 m, light transmittance showed greater wild fish species richness in Izmir region. In contrast, the wild fish species richness of the Muğla region fluctuated more. In terms of wild fish species richness, these fluctuations increased with salinity and DO, while they decreased with SST, pH and light transmittance. However, the range of variation of the recorded physico-chemical variables is rather narrow. The results of the correlation matrix indicate that the relationship between wild fish species richness and pH and SST was statistically significant in Izmir region (P < 0.05).

Keywords

Aquaculturedissolved oxygenfish communityIzmirlight transmittanceMuğlapHsalinitytemperature
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 100 , Issue 7 , November 2020 , pp. 1171 - 1179
Copyright
Copyright © Marine Biological Association of the United Kingdom 2020

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