Post-Mucilage Distribution, Daily Growth, Mortality, and Hatch Date Timing of Sand steenbras Lithognathus mormyrus (Linnaeus, 1758) Juveniles in the Sea of Marmara

Year 2024, Volume: 39 Issue: 3, 148 - 155, 01.08.2024

İsmail Burak Daban , Yusuf Şen , Alkan Öztekin , Adnan Ayaz , Uğur Altınağaç , Ali İşmen , Ahsen Yüksek , Uğur Özekinci , Fikret Çakır , Tekin Demirkıran , Gençtan Erman Uğur , Oğuzhan Ayaz , Buminhan Burkay Selçuk

https://doi.org/10.26650/ASE20241424227

Abstract

Between 2021-2022, a dense mucilage disaster occurred in the Sea of Marmara in Türkiye. Mucilage mostly covered coastal areas, which juvenile fish use for nurseries, growth, and protection. Due to Sand steenbras having been suggested as an environmental bioindicator species for Mediterranean coastal waters, this study attempts to reveal post-mucilage distribution and potential differences on the timing of hatching, daily age, growth, and mortality as revealed by the otolith microstructure. Individuals were sampled using beach seine nets from 12 equally spaced stations along the Sea of Marmara. Its presence and significant abundance in 10 out of 12 stations showed the Sand steenbras to be a common juvenile species for the Sea of Marmara. Hatching occurs between May-January, with peak hatching occurring in October. When considering that the mucilage had completely disappeared from the environment in August, the first set of hatching months can be seen to coincide with the dense mucilage. Thus, Sand steenbras can be considered as able to reproduce under these environmental conditions. The daily age of the Sand steenbras juveniles ranged between 38-235 days, with a mean of 120.3 ± 1.8 days. The daily growth and mortality rates were also calculated respectively as 0.226 mm/day and 4.11%.

Keywords

Hatch date distribution, daily growth, juvenile fish, spatial distribution, mucilage

Ethical Statement

No specific ethical approval was necessary for this study.

Supporting Institution

This work supported by The Scientific and Technological Research Council of Turkey (Project No: 121G097).

Project Number

Project No: 121G097

Thanks

The authors thanks to Captain Osman Odabaşı and Able Seaman Umut Tunçer for their helps in the field works.

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