Skeletal deformities of cultured sharpsnout seabream (Diplodus puntazzo) larvae during early life development

Abstract

Summary:In this study, skeletal deformities were investigated during early life stages in sharpsnout seabream, Diplodus puntazzo, larvae during larval development period. Whole larval period (1-42 days after hatching, DAH) was examined in three stages (preflexion, flexion and postflexion) based on notochord curve. Totally, 1210 specimens were examined during the experiment but 689 deformities were recorded in 256 larvae. Also, deformity rate was calculated as 21.2% at the end of the experiment. In terms of notochord flexion at stage-specific, no differences were found between preflexion (19.7%) and postflexion (15.8%) stages (p>0.05) while there was a significant difference during flexion stage (32.8%) in comparison with other groups (p<0.05). Correspondence analysis (CA) was performed in order to describe of skeletal deformities mainly depend on notochord flexion. According to CA analysis, it was determined that deformities were closely related with both flexion stages quantitatively and also postflexion stages qualitatively.Keywords: D. puntazzo, larval development, skeletal deformities, notochord flexion. Kültür koşullarındaki sivriburun karagöz (Diplodus puntazzo) larvalarında erken dönem iskelet deformasyonlarıÖzet: Bu çalışmada, yetiştiriciliği yapılan sivriburun karagöz (Diplodus puntazzo) larvalarının erken hayat döngüsü içerisinde iskelet sisteminde meydana gelen deformasyonlar incelenmiştir. Deneme boyunca larval dönem (1-42 gün) notokorda da meydana gelen değişimlere göre üç bölüme ayrılmıştır (bükülme öncesi, bükülme sırası ve bükülme sonrası). Deneme boyunca toplamda 1210 larva incelenmiş ve 256 deforme larvada 689 iskelet deformasyonu tespit edilmiştir. Deneme sonunda deformasyon oranı %21,2 hesaplanmıştır. Larval dönemdeki safhalara göre deformasyon oranları bükülme öncesi (%19,7) ile bükülme sonrası (%15,8) önemsiz bulunurken (p>0,05), bükülme sırası (%32,8) evresi önemlilik arz etmiştir (p<0,05). Notokordaya göre iskelet deformasyonları Korrespond Analiz yöntemi kullanılarak yapılmıştır. Bu analiz yöntemine göre iskelet deformasyonları safhalar arasında hem niteliksel olarak farklılıkları ortaya koymuş hem de bükülme sonrası dönemde niceliksel ayrımı belirtmiştir. Anahtar sözcükler: D. puntazzo, larval gelişim, iskelet deformasyonu, notokorda bükülmesi.

Kyphosis in Barbus pergamonensis (Cyprinidae-Actinopterygii) from Dalaman Stream Flowing to the Mediterranean Sea

“…In addition, there are some reports on kyphosis in cyprinid species from different regions (Bogutskaya et al, 2011). The adverse effects of skeletal deformities on the fish health and economy were also reported in detail in the previous studies (Yıldırım et al, 2014;Nguyen et al, 2016). In recent years, although the number of studies on wild and cultured fish health have been increasing in Turkey, there are limited studies on the skeletal deformities of fish such as cultured sharpsnout seabread Diplodus puntazzo (Yıldırım et al, 2014) and silverside Atherina boyeri (Jawad et al, 2017).…”

“…In farmed fish, these injuries can affect the organism by reducing growth (Hansen et al, 2010), limiting their feeding ability (López-Olmeda et al, 2012;Okamura et al, 2018), increasing the infection (Janakiram et al, 2018) and mortality rate (Jara et al, 2017). Moreover, these negative effects of the skeletal deformities inevitably cause reasonable economic loss in the fish farms (Boglione, 2013a;Yıldırım et al, 2014).…”

“…There are a variety of reasons for the occurrence of the skeletal deformities in fish. These are mostly known as scolosis, spondylolisthesis, lordosis (dorsal curvature, v shape), and kyphosis (ventral curvature, ^ shape (Yıldırım et al, 2014;Jawad et al, 2017). Although there are many reports of lordosis (Afonso et al, 2000;Fjelldal et al,2009;Gorman et al, 2010), the rate of occurrence of kyphosis is less common than lordosis (Jawad et al, 2017).…”