Naslov
Distribution, condition and abundance of non-native Ponto Caspian gobies from the tributaries of the Danube in Croatia

Autori
Piria, Marina ; Jakovlić, Ivan ; Šprem, Nikica ; Tomljanović, Tea ; Matulić, Daniel ; Treer, Tomislav

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
FINS Freshwater invasives networking for strategy / Caffrey, Joe - Dublin : Inland Fisheries Ireland, 2013, 53-54

Skup
1st FINS conference

Mjesto i datum
Gaillimh, Irska, 09.04.2013. - 11.04.2013

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
condition factor; CPUE; length-weight relationship; distribution; Neogobius sp.; Ponticola sp.

Sažetak
During the last decades several species of Ponto-Caspian gobies (Pisces, Gobiidae) have expanded upstream from their native distributions and invaded most of Europe, albeit their reported distributions vary greatly. Three invasive Ponto-Caspian species have so far been reported in Croatia: bighead goby Ponticola kessleri (Neilson and Stepien, 2009), monkey goby Neogobius fluviatilis (Pallas, 1814) and round goby Neogobius melanostomus (Pallas, 1814). Their distribution, abundance and condition from the River Sava were analyzed over a three-year period (2010-2012). Distribution and condition of monkey goby in tributaries of the River Sava (Kupa, Kupčina, Korana and Ilova) were also presented. CPUE values (number of fish per 100 m shoreline) were calculated and compared between the sites. A total of 246 specimens of monkey goby, 141 specimens of round goby and 21 specimens of bighead goby were analysed. In terms of distribution, monkey goby was found along the entire longitudinal profile of the River Sava and all studied tributaries. Round goby is still spreading upstream in the River Sava (ca. 80 km in one year) and the high CPUE at some selected sites were recorded (84 individuals per 100 m shoreline). Bighead goby occurred only in lower part of the River Sava. Condition factor varied between 0.74-1.06 for monkey goby, 1.18 – 1.21 for round goby and 0.96 - 1.26 for bighead goby. Values of b parameter of length weight relationship indicate good body condition in the Rivers Sava (monkey goby b=2.884-3.229 ; round goby b= 3.290 – 3.312 ; bighead goby b=3.343), Kupa (monkey goby b= 3.249) and Ilova (monkey goby b=3.291) and poorer body condition in the rivers Kupčina and Korana (monkey goby b=2.490 – 2.549). The presented results indicate that all three investigated species are well adjusted to their new habitat and that further range expansions are highly likely.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

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