Critically endangered fish species of Turkish Seas (Mediterranean and Aegean): Longfin gurnard, Chelidonichthys obscurus (Walbaum, 1792)

Abstract

Longfin gurnard Chelidonichthys obscurus (Walbaum, 1792) is reported several times from various researchers in the checklist of Turkish marine fishes. However, last three decades, the species is not occurred in the distributional range, comprising the northeastern Mediterranean Sea and Aegean Sea coast of Turkey. It is possibly critically endangered or absent in the Turkish Seas. Moreover, there has no any biological study been carried out on C. obscurus in Turkey. C. obscurus is considered to be critically endangered or regionally extinct in the eastern Mediterranean Sea and Aegean Sea coast of Turkey. This species might be recorded as "Critically Endangered" in the Mediterranean and Aegean Sea coast of Turkey in the IUCN Red List of Threatened Species.

Using otolith and body shape to discriminate between stocks of European anchovy (Engraulidae: Engraulis encrasicolus) from the Aegean, Marmara and Black Seas

“…Likewise, Keskin and Hasan (2012) identified genetic variations in anchovies sampled from different parts of the Black Sea, which agree with the findings of this study. Such differences between different parts of the Black Sea could be attributed to the fact that anchovies in the eastern, middle and western parts of the Black Sea originate probably from separated spawning areas situated on the southern and north‐western coast of the Black Sea (Gucu et al ., 2016; Kalnina & Kalnin, 1984; Turan et al ., 2004). Recent research indicates a central role of hydrographic circulation in driving the distribution of eggs and larval stages of anchovy (Cuttitta et al ., 2016; Falcini et al ., 2020; Ospina‐Alvarez et al ., 2015; Patti et al ., 2020).…”

“…The main objective of this study was to investigate and provide detailed information on the morphometric diversification of anchovy in the Aegean, Marmara and Black Seas. Previous studies used truss network morphometrics to check the existence of morphologically differentiated stocks of anchovy in the marine waters of Türkiye (Erdoğan et al ., 2009; Turan et al ., 2004). In this context, the present study aimed to apply various shape analyses, i.e ., geometric morphometrics of body shape as well as shape indices and elliptic Fourier analyses of sagitta otoliths to discriminate between stocks of anchovy in the Black Sea (26.5°E–39.9°E, 38.7°N–42.1°N), the Sea of Marmara and the Aegean Sea.…”

Stock discrimination of Chelidonichthys obscurus (Triglidae) in the central Mediterranean Sea using morphometric analysis and parasite markers

“…The longfin gurnard Chelidonichthys obscurus (Walbaum, 1792) is one of the three major species landed in Tunisia, together with the streaked gurnard, Chelidonichthys lastoviza (Bonnaterre, 1788) and the tub gurnard Chelidonichthys lucerna (Linnaeus, 1758) (Boudaya et al ., 2007). This triglid species is relatively common in the Mediterranean Sea (Sanches et al ., 2002) and is a critically endangered species on the Turkish Mediterranean coast (Turan et al ., 2016).…”

Identification of Macrourus species (Teleostei: Gadiformes) found near Prince Edward Islands in the Southern Ocean using molecular and morphological analyse.

“…Thus, changes or adaptations to the environment result in changes to the organism's physiology and behaviour and, overall, it causes changes to their phenotype/morphology (Turan, 1999;Rawat et al, 2017). Due to M. holotrachys and M. carinatus occupying the same habitat, they appear to respond similarly in terms of adapting to their environmental factors such as food availability or prolonged swimming and fishing intensity (Turan, 2004;González et al, 2016;Kaouèche et al, 2017;Chen et al, 2018). As a result, these two species have overlapping morphological characters.…”