Otolith Structure, Otolith Dimensions-Fish Length Rela­tionships and Age Determination of Fourspotted Megrim Lepidorhombus boscii (Risso, 1810)

Abstract

Özet:Benekli pisinin kör bölge otolitinde merkez tam ortada bulunurken, gözlü bölge otolitinde ise otolitin posterior kısmına daha yakındır. Bundan dolayı, opak ve hiyalin halkalar kör bölge otolitinde hem anterior hem posterior kısımda gözlenebilirken, gözlü bölge otolitinde merkez posterior tarafa daha yakın olduğu için halkalar bu kısımda çakışmakta ve halka devamlılığının takibi güçleşmektedir. Kör ve gözlü bölge ortalama otolit boyları 4.599 ±0.069 mm ve 4.768 ±0.067 mm (P<0.05), genişlikleri 3.285 ±0.043 mm ve 3.511±0.047 mm (P<0.05), ağırlıkları 0.0148 ±0.0005 g ve 0.0154 ±0.0005 g (P>0.05)'dır. Merkezin durumu ve annulusların devamlılığı sebebiyle yaş okumalarında kör bölge otoliti tercih edilmelidir. Yaş okumaları bütün ve kırılarak yakılmış kör bölge otolitlerinde yapılmıştır. Abstract: Otolith Structure, Otolith Dimensions-Fish Length Relationships and Age Determination of Fourspotted Megrim Lepidorhombus boscii (Risso, 1810)The core is centric in the fourspotted megrim's blind side otoliths where it is near the posterior area in the ocular side otoliths. Consequently, while the opaque and hiyalin rings were observed both anterior and posterior area on the blind side otoliths, rings were overlapped on the ocular side otoliths, because of having a core nearly posterior area and this made it difficult to follow the continuity of zones. The mean values of the blind and ocular side otoliths were 4.599 ±0.069 mm ve 4.768 ±0.067 mm (P<0.05) in length, 3.285 ±0.043 mm ve 3.511 ±0.047 mm (P<0.05) in width, 0.0148 ±0.0005 g ve 0.0154 ±0.0005 g (P>0.05) in weight respectively. Because of the case of focus and continuity of annuli, the blind side otolith has been prefered in age determination. Age readings have been made in whole and broken-burnt blind side otolith.

Relationships between fish length and otolith size for five cyprinid speciesfrom Lake Ladik, Samsun, Turkey

“…Otolith biometry-body length relationships have been determined for many fish species by different investigators (Gamboa, 1991;Harvey et al, 2000;Waessle et al, 2003;Longenecker, 2008;Battaglia et al, 2010;Zorica et al, 2010;Potier et al, 2011;Skeljo and Ferri, 2012). In Turkey, although a number of studies have been reported on relationships between otolith size and fish length (Şahin and Güneş, 1998;Can, 2000;Ceyhan and Akyol, 2006;Samsun and Samsun, 2006;Bostancı and Polat, 2008;Eroğlu and Şen, 2009;Bostancı et al, 2009;Bostancı et al, 2012;Cengiz et al, 2012;Basusta et al, 2013;Bilge, 2013;İşmen et al, 2013), such information is still lacking for many members of the ichthyofauna. On the other hand, the studies on otolith features of cyprinid fishes have shown an increase in recent years (Şen et al, 2001;Aydin et al, 2004;Bostancı et al, 2007;Gumus et al, 2007;Bostancı, 2009;Bostancı and Polat, 2011;Kontaş, 2012;Basusta et al, 2013;Keskin, 2013).…”

OTOLITH SIZE-TOTAL LENGTH RELATIONSHIP IN SPINY EEL, Mastacembelus mastacembelus (BANKS & SOLANDER, 1794) INHABITING IN KARAKAYA DAM LAKE (MALATYA, TURKEY)

“…However some researchers Bostancı and Polat, 2008;Bostancı and Polat, 2009) have determined stronger and positive linear relationships between fish length and otolith size (length, width and weight) in different fish species that have different body form.…”

Age and growth of four-spotted megrim (Lepidorhombus boscii Risso, 1810) from Saros Bay (Northern Aegean Sea, Turkey)

“…In this study, the age class of the four-spotted megrims ranged between 1 and 13 ages. Castilho et al (1993), Vassilopoulou & Ondrias (1999), Robson et al (2000), Bostanci & Polat (2008) and Teixeira et al (2010) reported the longevity limits as 0-12, 0-8, 4-11, 3-8 and 2-9 ages, respectively. Nash & Geffen (2005) stated that the reasons of differences in longevity could be attributed to latitudinal differences as well as to the effects of temperature, intensities of competition for food, food availability, life history strategies and fishing efforts.…”

“…Jica (1993) conducted its stock assessment in the Northern Aegean Sea. Bostanci & Polat (2008) studied the otolith structure, otolith dimensions-fish length relationships and age determination of L. boscii. Ismen et al (2007) and Ozekinci et al (2009) reported the length-weight relationships of the four-spotted megrim from Saros Bay.…”