Sıddıklı Barajı’nda Yaşayan Yayın Balığı (Silurus glanis, L., 1758)’nın Üreme Özellikleri

Abstract

In this study, some reproduction properties (sex ratio, reproduction period, egg diameter and fecundity) of Silurus glanis inhabiting Sıddıklı Reservoir were investigated. A total of 200 samples were caught between September 2015 and August 2016 from different regions of Sıddıklı Reservoir. Sex ratio was calculated as 0.88:1.00 (Female: Male). The sex ratio was not statistically different from the expected 1.00:1.00 (χ2= 0.841, P>0.05). The values of gonadosomatic index (GSI) varied from 0.033 to 11.80 in females and 0.008 to 0.451 in males. According to GSI values, reproduction period of the S. glanis in Sıddıklı Reservoir was determined to be between April and June. The mean total fecundity and egg diameter were calculated as 46343 eggs/individual and 1.758 mm, respectively. Relative fecundity for each kilogram of female fish was 13000 eggs. The strong relationships between total fecundity-length and total fecundity-weight were determined (r2>0.80).

Reproductive traits of the European catfish (Silurus glanis) during the early stages of invasion in the Lower Tagus River

“…Finally, our findings highlight the importance of comprehensive size-at-maturity data, even in the absence of histological information. This observation aligns with previous studies (Alp et al, 2004; Yazici et al, 2018) and provides valuable insights into catfish biology. However, future research may consider incorporating histological data to further enhance our understanding of European catfish reproductive biology.…”

“…Furthermore, our analysis revealed a significant positive relationship between oocyte size and both fish length and months, indicating that larger females tend to produce larger oocytes. This observed pattern in oocyte size aligns with findings from populations of European catfish in Eastern Europe (Wisniewolski, 1988;Brujenko, 1967;Bugaj, 1966;Šichšabekov, 1978;Mukhamediyeva & Sal'nikov, 1980) and the Eastern region of Turkey (Alp et al, 2004;Akyurt, 1988;Yazici et al, 2018) (Table 1). Moreover, the size frequency distributions of oocytes revealed that females retained the ability to spawn due to the asynchronous development of oocytes.…”

“…Absolute fecundity increased with increasing length and mass, following an expected pattern observed in fishes (Winemiller & Rose, 1992). Similar positive relationships between fecundity and total length or weight have been documented in European catfish populations from both native (Akyurt, 1988;Alp et al, 2004;Yazici et al, 2018;Yesilcicek & Kalayci, 2020) and non-native areas (Puzzi et al, 2003). In our study, S. glanis exhibited high fecundity, with absolute fecundity ranging from 8,961 to 335,500 oocytes, which is within the range of estimated fecundities reported in previous studies (Puzzi et al, 2003;Alp et al, 2004;Yazici et al, 2018;Yesilcicek & Kalayci, 2020; see Table 1).…”

“…We recorded a mean estimated relative fecundity of 14.2 oocytes per gram (6.2 -28.5 oocytes per gram). Similar estimates have been observed for catfish in the Menzelet Reservoir (mean 8.4 oocytes per gram) (Alp et al, 2004), the Karasu River (mean 12.7 oocytes per gram) (Akyurt, 1988), the Siddikkli Reservoir (13 oocytes per gram) (Yazici et al, 2018), and the Borcka Reservoir (mean 20.2 oocytes per gram) (Yesilcicek & Kalayci, 2020). However, catfish from Eastern Europe had the highest recorded estimates at a mean of 29 oocytes per gram (7-42 oocytes per gram) (Šichšabekov, 1978) (see Table 1).…”

Some Morphometric Relationships of Wels catfish (Silurus glanis L., 1758) Inhabiting Sıddıklı Dam (Kırşehir, Turkey)

“…There were several researches on the age (Yılmaz et al 2007;Saylar, 2009;Alp et al, 2011;Saylar, 2014), growth (Carol et al, 2009Copp et al, 2009;Uysal et al, 2009;Alp et al, 2011), reproduction (Yazıcı et al, 2018), morphological characters (Ünlü et al, 2012), and the diet (Czarnecki et al, 2003;Bora & Gul, 2004;Alp, 2017) of Wels catfish. However, no studies were conducted on the morphometric biometry of this species.…”