Record of Juvenile Eelpout Lycodapus dermatinus (Zoarcidae) in Pacific Waters of Kamchatka
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Record of Juvenile Eelpout Lycodapus dermatinus (Zoarcidae) in Pacific Waters of Kamchatka D. Ya. Saushkinaa, * and Yu. K. Kurbanova aAll-Russia
Research Institute of Fisheries and Oceanography, Kamchatka Branch, Petropavlovsk-Kamchatsky, Russia *e-mail: [email protected] Received November 27, 2019; revised December 19, 2019; accepted December 20, 2019
Abstract—Data on the record of juveniles of a rare species, Lycodapus dermatinus, of the family Zoarcidae are given. Their plastic and meristic features and tooth arrangement features and features of their head seismosensory system are described. Keywords: Lycodapus dermatinus, morphology, Kamchatka waters DOI: 10.1134/S0032945220050100
The family Zoarcidae is one of the most systematically diverse fish groups. According to one of the latest revisions (Parin et al., 2014), about 140 species of 25 genera live in Russian waters. Although an increased attention has been given to their study in recent times, most studies in this area are devoted only to the most widespread species of this family (Tokranov and Orlov, 2002; Balanov et al., 2004; Badaev and Balanov, 2006; Stevenson and Sheiko, 2009; Savel’ev, 2011). The data on the description of their larvae and juveniles, including fishes of the genus Lycodapus, are also rather scarce and limited (Matarese et al., 1989; Grigor’ev, 2007; Sokolovskii and Sokolovskaya, 2008; Voskoboinikova et al., 2012). According to the current knowledge, the genus Lycodapus includes 13 species; eight of them (L. derjugini, L. endemoscotus, L. fierasfer, L. leptus, L. microchir, L. parviceps, L. poecilus, and L. psarostomatus) occur in the Far Eastern waters of Russia (Taranets, 1937; Andriyashev, 1939; Schmidt, 1950; Fedorov, 1973a, 1973b, 2000; Peden and Anderson, 1978, 1981; Anderson, 1994; Borets, 2000; Sheiko and Fedorov, 2000; Mecklenburg et al., 2002; Balanov, 2003a, 2003b; Anderson and Fedorov, 2004; Parin et al., 2014). MATERIALS AND METHODS In May 2018, an ichthyoplankton survey in the Kronotsky Bay (coordinates: 54°23′8″ N, 161°27′9″ E) recorded a representative of the genus Lycodapus (L. dermatinus) for the first time in the northwestern Pacific Ocean; it was found in the catch of an IKS-80 ichthyoplankton net (gas no. 14, area of the mouth opening, 0.5 m2) from a depth of 350 m. It is a mesobenthal species that lives at a depth of 165–1370 m in
the eastern part of the Pacific Ocean from the Gulf of Alaska to Peru (Peden and Anderson, 1978; Mecklenburg et al., 2002; Robertson et al., 2017). The captured L. dermatinus specimen (Fig. 1) with a total length (TL) of 46.2 mm and a standard length (SL) of 44.8 mm was recorded in 4% formalin. Its further laboratory treatment was carried out using a Micromed MC-2 ZOOM binocular stereoscopic microscope at ×1 magnification. The species were identified based on the works of Peden and Anderson (1978, 1981). Below, we describe juveniles of this new species in Far Eastern waters. RESULTS AND DISCUSSION Body elongated and laterally compressed. Caudal peduncle relatively
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