Juvenile Parasagitta setosa (J. Müller, 1847) (Chaetognatha) from Shallow Waters of the Southern Black Sea: Temporal Size Structure, Gonad Maturity, and Gut Content

Year 2022, Volume: 18 Issue: 3, 403 - 414, 01.09.2022

Funda Üstün

https://doi.org/10.22392/actaquatr.1087064

Abstract

The present study aimed to assess the abundance, body length, maturity stage, and gut content of Parasagitta setosa in the southern Black Sea, Turkey. The study was conducted twice a month from January 2008 to December 2008. Vertical hauls with a 112 μm mesh size plankton net were used from a depth of 50 m to the surface of the Sinop coast. During the study period, the abundance of this species was generally low, varying between 10 and 980 ind.m-2. In particular, the abundance of P. setosa was low from December to July but increased from August. Small size individuals were predominated, with both 1 – 1.99 mm and 2 – 2.99 mm size classes accounting for 62% of the total P. setosa sample. Four developmental stages were determined based on ovary and seminal vesicle development. Stage I (immature) was the predominant developmental stage in the P. setosa population. A total of 1580 individuals were dissected; however, only 53 individuals had food items in their gut (3.4%), with copepods (54.73%) accounting for the predominant group the food content. It was determined that the abundance values and feeding ratios of P. setosa were low in the coastal area of Sinop and new individuals join in the population during the summer-autumn period.

Keywords

Population structure, developmental stages, feeding, Turkey.

Thanks

I thank Sinop University Fisheries Faculty, Department of Hydrobiology for providing opportunities for the research cruise; the personnel of R/V Arastırma-1 and Farukcan for assistance in the field studies; Dr. Tuba Terbıyık Kurt and Dr. Jordan Grigora for useful suggestions and the referees for their valuable contributions.

Güney Karadeniz’in Sığ Sularında Juvenil Parasagitta setosa (J. Müller, 1847) (Chaetognatha): Zamansal Boyut Yapısı, Gonad Gelişimi ve Mide İçeriği

Abstract

Mevcut çalışma, Türkiye’nin Güney Karadeniz bölgesinde Parasagitta setosa bolluğunu, vücut uzunluğunu, olgunluk evresini ve bağırsak içeriğini değerlendirmeyi amaçlamıştır. Çalışma, Ocak 2008 – Aralık 2008 tarihleri arasında ayda iki kez gerçekleştirildi. Sinop kıyısında, 50 m derinlikten yüzeye dikey çekimlerle 112 µm göz açıklığına sahip plankton kepçesi kullanıldı. Çalışma süresi boyunca, türün bolluk değerleri genellikle düşük olup, 10 ile 980 birey.m-2 arasında değişmiştir. Özellikle, P. setosa bolluğu Aralık'tan Temmuz ayına kadar düşüktü ancak Ağustos ayından itibaren artmıştır. P. setosa popülasyonuna küçük boyutlu bireylerin baskın olduğu belirlenmiştir. Toplam P. setosa örneğinin %62'sini oluşturan 1 – 1.99 mm ve 2 – 2.99 mm boy sınıflarına ile küçük boyutlu bireyler baskındı. Ovaryum ve seminal vezikül gelişimi kullanılarak dört gelişim evresi belirlenmiştir. P. setosa popülasyonunda evre I (olgunlaşmamış evre) baskın olmuştur. Toplam 1580 birey disekte edilmiştir. Bununla birlikte, sadece 53 bireyin (%3,4) bağırsaklarında besin maddeleri bulunmuştur. Besin içeriğinin başlıca grubunu kopepodlar (%54,73) oluşturmuştur. Sinop kıyısal alanında P. setosa türünün bolluk değerlerinin ve beslenme oranlarının düşük olduğu ve yeni bireylerin yaz - sonbahar döneminde populasyona katıldığı belirlenmiştir.

Keywords

Populasyon yapısı, gelişimsel evreler, beslenme, Türkiye.

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