43 ANNALES · Ser. hist. nat. · 28 · 2018 · 1 original scientifi c article DOI 10.19233/ASHN.2018.07 received: 2018-05-03 FIRST RECORD OF THE MEAGRE, ARGYROSOMUS REGIUS (ASSO, 1801), IN SLOVENIAN COASTAL WATERS WITH ADDITIONAL RECORDS FROM THE CROATIAN PART OF THE ADRIATIC SEA Borut MAVRIČ National Institute of Biology, Marine Biology Station Piran, Fornače 41, SI-6330 Piran e-mail: Borut.Mavric@nib.si Branko DRAGIČEVIĆ Institute of Oceanography and Fisheries, Split, I. Meštrovića 63, 21000 Split, Croatia ABSTRACT One specimen of meagre, Argyrosomus regius (Asso, 1801), was caught by trawling in the waters off Slovenia on 24th November 2016 at the depth of cca. 20 m above sandy-muddy bottom. This is the fi rst record of this species for the Slovenian part of the Adriatic Sea. Due to the fact that there are no wild populations in the Middle and North Adriatic and that remaining wild populations in the Southern Adriatic are scarce and small, the specimen is supposed to be an escapee from one of the mariculture facilities. Additional occurrences of this species from the Croatian part of the Adriatic Sea are reported. Key words: meagre, Argyrosomus regius, Adriatic Sea, farm escapee, aquaculture PRIMA SEGNALAZIONE DI OMBRINA BOCCADORO, ARGYROSOMUS REGIUS (ASSO, 1801), IN ACQUE COSTIERE SLOVENE CON ULTERIORI RITROVAMENTI NELLA PARTE CROATA DELL‘ADRIATICO SINTESI Un esemplare di ombrina boccadoro, Argyrosomus regius (Asso, 1801), è stato catturato con la rete a strascico nelle acque al largo della Slovenia, il 24 novembre 2016, ad una profondità di cca. 20 m, sopra il fondale sabbio- so-fangoso. Si tratta del primo ritrovamento di questa specie per la parte slovena dell’Adriatico. Poiché non ci sono popolazioni allo stato selvatico nell’Adriatico centrale e settentrionale, e visto che le restanti popolazioni selvatiche nell’Adriatico meridionale sono scarse e limitate, gli autori ipotizzano che l’esemplare sia scappato da uno degli impianti di maricoltura. Vengono inoltre segnalati altri ritrovamenti di questa specie nella parte croata dell’Adriatico. Parole chiave: ombrina boccadoro, Argyrosomus regius, mare Adriatico, fuggitivo, acquacoltura 44 ANNALES · Ser. hist. nat. · 28 · 2018 · 1 Borut MAVRIČ & Branko DRAGIČEVIĆ: FIRST RECORD OF THE MEAGRE, ARGYROSOMUS REGIUS (ASSO, 1801), IN SLOVENIAN COASTAL ..., 43–50 INTRODUCTION The meagre, Argyrosomus regius (Asso, 1801), is a demersal, oceanodromus, ray-fi nned fi sh of the family Sciaenidae. It is a large top-predator, with a high tro- phic level (4.3) that consumes large sized and heavy preys. It feeds on a wide range of crustaceans and fi sh (Valero-Rodriguez et al., 2015). Adults inhabit inshore and shelf waters while juveniles and subadults prefer estuaries and coastal lagoons. It mostly occurs over sandy bottoms, close to rocks, at depths from 1 - 200 m (Louisy, 2002). Original distribution of the meagre is the eastern Atlantic, from Norway to Gibraltar and Congo, including the Mediterranean and the Black Sea (Griffi ths & Heemstra, 1995). It also migrated via Suez Canal to the Red Sea as an anti-Lessepian migrant (Chao & Trewavas 1990). In the Adriatic Sea, the meagre was historically wide- spread along the eastern coast, especially in sandy and muddy shallows with turbid and fresh water infl uence although it was considered rare or very rare (Šoljan, 1975; Jardas 1985). Grubišić (1967) considered areas of Ulcinj (Bojana rivermouth), Omiš (Cetina rivermouth) and Neretva rivermouth as the only areas with locally abundant populations. However, at the end of 20th century the fi sheries reports about the species became very scarce, with the Bojana rivermouth (Montenegro) being one of the last locations in the Adriatic Sea hosting natural/wild populations (Joksimović, 2007). Jardas et al. (2008) have declared it as a regionally extinct species in the Red Book of Sea Fishes of Croatia. For the Slo- venian sea there are no records for this species in the available literature, such as Matjašič & Štirn (1975) and Kryštufek & Janžekovič (1999). The meagre has suffered alarming declines in other parts of the Mediterranean as well (Quéro & Vayne, 1987; Quéro, 1989; Wolff, 2000), mostly due to overexploitation and habitat degradation. On the other hand, it is considered as an emerging spe- cies in the Mediterranean aquaculture (Monfort, 2010), with the main production reported in Egypt (brackish ponds) and in Spain, France, Italy and Turkey (off-shore mariculture). MATERIAL AND METHODS The meagre specimen was caught by trawling in the waters off Slovenian coast on 24th November 2016 at the depth of cca. 20 m above sandy-muddy bottoms (Fig. 1). The specimen was sold at the local market, but was pho- tographed by the fi sherman previously since it was not identifi ed (Fig. 2a). The researchers from Marine Biology Station of the National Institute of Biology were informed about the catch and were given the photographs to identify the specimen. Using the photographs, the total length of the specimen was estimated. Additionally, we managed to locate 3 records of this species caught in the wild from Croatia whose identifi cation was also based solely on photographs of the specimens (Fig. 1). On 26th July 2011, a specimen was caught near vil- lage of Brist (middle Adriatic, Croatia) (Fig. 2b). In sum- mer of 2012 another specimen of meagre was collected by sportive fi sherman from area of Pelješac peninsula (southern Adriatic; Croatia) (Fig. 2c) and in December 2017 one specimen was caught in waters off Zadar (middle Adriatic, Croatia). Photos of all the mentioned specimens were sent to the Institute of Oceanography and Fisheries in Split (Croatia). Beside photos, data on weight were provided directly by the fi shermen for individuals from Brist and Pelješac while we estimated length of the specimen from Zadar in relation to the size of the fi sh container. Since we did not get the permission for publication of the photo of the Zadar specimen, this one is not shown in the paper, but is available on request. Fig. 1: Map of the Adriatic Sea with localities where meagre specimens were caught (black dots; numbers represent the following localities: 1- Piran, 2 – Brist, 3 – Pelješac, 4 – Zadar, 5 – Rab), with localities (Apuglia, Monfalcone, Hvar, Zadar) where the meagre is cultivat- ed (squares) and the area (Bojana river mouth) where the last known natural population still occurs (circle). Sl. 1: Zemljevid Jadranskega morja z območji, kjer so bili ujeti obravnavani primerki hame (črne pike; šte- vilke predstavljajo naslednja območja najdb: 1 – Piran, 2 – Brist, 3 – Pelješac, 4 – Zadar, 5 – Rab), z območji (Apulija, Monfalcone, Hvar, Zadar), kjer hame vzgajajo v marikulturah (kvadrati) in z območjem (ustje reke Bo- jane), kjer obstaja še zadnja znana naravna populacija te vrste (krog). 45 ANNALES · Ser. hist. nat. · 28 · 2018 · 1 Borut MAVRIČ & Branko DRAGIČEVIĆ: FIRST RECORD OF THE MEAGRE, ARGYROSOMUS REGIUS (ASSO, 1801), IN SLOVENIAN COASTAL ..., 43–50 Fig. 2: Photographs of the caught meagre specimens from: a – Piran (photo: M. Buh), b – Brist (photo: Željko and Ernesto Trampa), c – Pelješac (photo: Pero Ugarković), d – Rab (photo: Šime Sušić). Sl. 2: Fotografi je ujetih primerkov hame iz: a – Pirana (foto: M. Buh), b – Brista (foto: Željko in Ernesto Trampa), c – Pelješca (foto: Pero Ugarković), d – Raba (foto: Šime Sušić). 46 ANNALES · Ser. hist. nat. · 28 · 2018 · 1 Borut MAVRIČ & Branko DRAGIČEVIĆ: FIRST RECORD OF THE MEAGRE, ARGYROSOMUS REGIUS (ASSO, 1801), IN SLOVENIAN COASTAL ..., 43–50 RESULTS AND DISCUSSION All specimens were identifi ed as Argyrosomus regius based on distinctive features that could be clearly seen from the photographs provided (Fig. 2). All specimens had elongated body pearly-silver in colour with bronze hints on the dorsal part and fi ns of reddish colour; the second dorsal fi n much longer than the fi rst; ventral fi ns posi- tioned directly below relatively short pectoral fi ns. Head is rather large in respect to the body with a large terminally positioned mouth of yellowish colour. The estimated total length (TL) of the specimen from Slovenia was 650 mm (Fig. 2a) while the Croatian specimen from Brist measured 740 mm TL and weighed 4.5 kg (Fig. 2b) and the specimen from Pelješac weighed 2.2 kg (Fig 2c, no data on TL). For the specimen from Zadar area, we estimated the TL rang- ing between 750-800 mm. According to the previously documented length-at fi rst maturity (Gonzalez-Quiros et al., 2011; Abou Shabana et al., 2012) all specimens were either mature or close to its matureness. Prior to these records, the last documented record of a wild specimen in the Adriatic Sea dates from August 2008, from the area near Neretva river mouth in Croatia (Dulčić et al., 2009). This specimen was considered as an escapee from the mariculture. In Croatian waters the meagre was declared as regionally extinct species (Jardas et al., 2008), although there is a small possibility that some specimens can fi nd their way into Croatian waters from the area of Bojana river mouth (Montenegro), hosting one of the last wild populations of this species (Joksimović, 2007) in the Adriatic Sea. Since there are no wild populations in the Middle and North Adriatic and due to the fact that the only remaining wild populations in the southern Adriatic are scarce (Joksimović, 2007; Jardas et al., 2008; Dulčić et al., 2009), we presume that the specimen collected near Brist (Croatia) probably originated from the mariculture facilities from Mljet island which was active during 2011 when the specimen was collected. The same is probably true for the specimen from Pelješac where, beside one specimen reported herein, several other specimens were caught in summer 2012 by various fi shermen (P. Ugar- ković, pers. comm). We are also aware of a specimen caught near Ulcinj (Montenegro) in May 2016 which appeared on social network (Facebook group »More i Ribolov«) as a curiosity. Presence of farmed meagre escapees have been reported from many areas in the Mediterranean, even in areas far from meagres natural distribution, or in areas where it is considered locally absent or extinct (Mayol et al., 2000; Dulčić et al., 2009; Sanchez-Jerez et al., 2011; Arechavala-Lopez et al., 2015). There are several places in the Adriatic where the meagre is still farmed, although the production is relatively small in comparison to overall marine fi sh production (Kružić et al., 2016; Cataudella & Spagnolo, 2011). In Croatia there are two areas where meagre is still cultured in the fl oating cages, the fi rst on island Hvar and the second on islands off Zadar (Pašman, Ugljan, Dugi otok) (Kružić et al., 2016). Farms from Zadar area were probably the source of meagre escapees encountered in the area. Indeed, in 2012 there were media reports of signifi cant quantities of smaller specimens (300-700 g) of meagre being caught near Lošinj Island by the local fi shermen which probably originated from fi sh farms in vicinity (Šuljić, 2012). In Italian part of the Adriatic Sea two ar- eas host the meagre production, Adriatic part of Apulia and the Gulf of Trieste (Cataudella & Spagnolo, 2011). According to geographic position, the Cà Zuliani mariculture at Monfalcone in the Gulf of Trieste seems to be the appropriate site where the Slovenian specimen originated from. In that farm, placed in the East-West canal of Monfalcone, two small cages were, at the time, devoted to the production of the meagre. The sea water in this canal is heated by the discharge water of electric plant helping to a better production of the species, known not to be prone to the temperatures below 11°C, which are common for the area during winter periods. Without the heated water discharges the production of the meagre would not be possible, as was observed in the beginning of 2017 when all specimens from the cages died due to water temperature drop, which was a direct consequence of the disrupted water discharge from the power plant (biologist and mariculture oper- ator Walter de Walderstein, pers. comm.). The water temperature drops during winter time, from the site of production through the canals to the waters of the Gulf of Trieste, which would most probably prevent any possible escapees to reach the open sea. According to the interview held with Walter de Walderstein there were also no damages observed to the cages in the ca- nal and therefore no fi sh are presumed to have escaped from there. According to these statements it cannot be excluded that the Slovenian specimen could originate from the distant maricultures from the Middle Adriatic, which are several hundred kilometres away from the place of capture. Meagre have a low degree of site fi delity (Toledo-Guedes et al., 2009; Arechavala-Lopez et al., 2016) and regularly perform seasonal migrations. Moreover, they are capable of swimming over long distances (Gonzalez-Quiros et al., 2011; Morales-Nin et al., 2012). Distance from Middle Adriatic mariculture facilities to the Gulf of Trieste could still be within its range and possible to overcome. According to Grubišić (1967), this species has been occurring in the northern Adriatic until the middle of the 20th century, although it was very rare. Despite this fact the meagre has so far never been recorded for the area of the Slovenian Sea according to available literature (Matjašič & Štirn, 1975; Kryštufek & Janžekovič, 1999), making the specimen reported here-in the fi rst record for the Slovenian Sea. Finally, although rare, occurrences of meagre in the Adriatic Sea seem to be occasional in the recent years. During the fi nal preparation of this manuscript, we got informed about the catch of meagre from in waters off 47 ANNALES · Ser. hist. nat. · 28 · 2018 · 1 Borut MAVRIČ & Branko DRAGIČEVIĆ: FIRST RECORD OF THE MEAGRE, ARGYROSOMUS REGIUS (ASSO, 1801), IN SLOVENIAN COASTAL ..., 43–50 Lopar on Rab island (10th April 2018; Croatian coast; W=1.75 kg) (Fig. 1) accompanied with a photo of the specimen (Fig. 2d) (Šime Sušić, pers. comm.). ACKNOWLEDGMENTS Authors would like to thank a fi sherman Mr. Mar- jan Buh, Mr. Pero Ugarković, Mr. Ernesto Trampa, Mr. Željko Trampa, Mr Šime Sušić and Mrs. Franka Jović for providing photos of the caught meagre specimens. Ad- ditionally, we would like to thank prof. dr. Lovrenc Lipej for his help with determining the Slovenian specimen and his encouragement with preparing the manuscript. Our gratitude goes also to a colleague Nicola Bettoso for providing us information regarding the mariculture in Monfalcone. 48 ANNALES · Ser. hist. nat. · 28 · 2018 · 1 Borut MAVRIČ & Branko DRAGIČEVIĆ: FIRST RECORD OF THE MEAGRE, ARGYROSOMUS REGIUS (ASSO, 1801), IN SLOVENIAN COASTAL ..., 43–50 PRVI PRIMER POJAVLJANJA HAME, ARGYROSOMUS REGIUS (ASSO, 1801), V SLOVENSKEM OBALNEM MORJU Z DODATNIMI ZAPISI POJAVLJANJA IZ HRVAŠKEGA DELA JADRANA Borut MAVRIČ National Institute of Biology, Marine Biology Station Piran, Fornače 41, SI-6330 Piran Branko DRAGIČEVIĆ Institute of Oceanography and Fisheries, Split, I. Meštrovića 63, 21000 Split, Croatia POVZETEK Primerek hame, Argyrosomus regius (Asso, 1801) so 24. novembra 2016 ujeli v pridneno vlečno mrežo na peščeno muljastem delu slovenskega morja, na globini okoli 20 m. To je prvi zapis za to vrsto v slovenskem morju. Ker v srednjem in severnem delu Jadrana ni divjih populacij hame, gre verjetno za primerek, ki je ušel iz marikulture. 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