Conjoined Twinning Incidences in Trachurus mediterraneus(Steindachner, 1868) Eggs in Southern Marmara Sea

Yapışık ikizlik doğal koşullarda nadiren gözlenen ağır bir gelişim bozukluğudur ve vücutlarının herhangi bir kısmından birleşik olan iki bireyi ifade eder. Herhangi bir neden olmaksızın ağır gelişim bozukluklarıyla karşılaşılabilse de; bu tür gözlemler çoğunlukla kötüye giden çevresel koşullarla ilişkilendirilirler. Bu nedenle olağan dışı yapışık ikiz vakalarının varlığı denizel ortamı, balıkçılığı ve toplum sağlığını tehdit eden önemli problemlere işaret ediyor olabilir. Dolayısıyla, bu çalışmanın amacı Güney Marmara Denizi, Bandırma Körfezi'nde Trachurus mediterraneus türüne ait yapışık ikiz vakalarını takdim etmek ve yeni sorular üremek amacıyla muhtemel nedenlerini tartışmaktır. Haziran 2012 tarihinde, Bandırma Körfezi İhtiyoplankton Taraması kapsamındaki istasyonlarda 16 horizontal ve vertikal Hensen Net çekimi gerçekleştirilmiş; bu istasyonlardan üçünde yapışık ikiz vakalarıyla karşılaşılmıştır. Tüm istasyonlar genelinde Trachurus mediterraneus, tüm yumurtaların %34.74'lük kısmını oluşturarak en baskın tür olmuştur. Anormal gelişime sahip bireyler kıyısal bölgede yer alan 9, 10 ve 13 numaralı istasyonlarda gözlenmiştir. Dokuz numaralı istasyon yaklaşık 20 m derinlikte olup; körfezin batı kıyılarında, Karşıyaka Beldesi ile Dalyan Köyü arasında yer almaktadır. On ve onüç numaralı istasyonlar ise körfezin doğu kıyılarındaki Yenice Köyü açıklarında yaklaşık 10 ve 30m derinliklerdedir. Her üç istasyonda gözlenen toplam tür sayısı 16 adettir. Trachurus mediterraneus yumurtalarının 9 numaralı istasyondaki toplam bolluğu 166 adet (baskınlık; %34.80), 10 numaralı istasyonda 288 (baskınlık; %84.42) ve 13 numaralı istasyonda ise 173 (baskınlık; %35.02) adet olarak bulunmuştur. Bu istasyonlarda yüzey suyundan yapılan ölçümlerde sıcaklık, tuzluluk, çözünmüş oksijen ve pH değerlerinde herhangi bir anormallik gözlenmemiştir. Dolayısıyla gözlenen yapışık ikiz vakalarının kirlilik nedeniyle meydana gelme olasılıklarının yüksek olabileceği düşünülmüştür

Marmara Denizi'nin Güneyinde Trachurus Mediterraneus (Steindachner, 1868) Yumurtalarına Ait Yapışık İkiz Gözlemleri

Conjoined twinning is a rarely existed gross malformation in natural conditions. The term refers to the two individuals united at any part of their bodies. The extraordinary incidences of conjoined twinning cases may reflect important problems on the marine environment. Therefore, the purposes of this study were to report the incidences of Trachurus mediterraneusconjoined twins in Bandırma Bay, Southern Marmara Sea and to discuss the possible causes of them to derive new research questions. Four polyembryonic individuals were collected from three stations of Bandırma Bay Ichthyoplankton Survey in June 2012. The anomalous individuals were observed at the stations, St-9, 10 and 13 (Critical Stations). St-9 was at about 20m depth contour between Karşıyaka town and Dalyan village in western coasts of bay. St-10 and 13 was off Yenice village at about 10 and 30m depth contoursrespectively in the eastern coasts of the bay. The surface temperature, salinity, dissolved oxygen and pH of critical stations were seemed to be normal. Therefore the pollution was considered as the most possible reason of these incidences

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Turkish Journal of Fisheries and Aquatic Sciences-Cover
  • ISSN: 1303-2712
  • Başlangıç: 2015
  • Yayıncı: Su Ürünleri Merkez Araştırma Enstitüsü - Trabzon
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