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Statements

Subject Item
n2:RIV%2F68081766%3A_____%2F12%3A00389477%21RIV13-GA0-68081766
rdf:type
skos:Concept n9:Vysledek
dcterms:description
Monkey goby is one of many Neogobius species that have invaded European waters in recent decades. Little interest has been paid to this species up till now, probably due to its lower rate of invasiveness compared to some other goby species, e.g., round goby. As with any non-native species, however, it represents a potential danger for native fauna. The aim of this study is to fill in the missing data concerning monkey goby biology and population structure in its native area of distribution, thereby providing a baseline for future comparative studies in non-native distribution areas. Samples of monkey gobies, Neogobius fluviatilis (Pallas, 1814), were obtained seasonally from the lower, Bulgarian stretch of the Danube River during 2006. The fish collected were sexed, measured, and weighed. After that the gonads were removed and weighed. These data were used to calculate sex ratio, length-frequency distribution, condition coefficient, and gonadosomatic index. Dissected ovaries were used for histological analysis of oocyte distribution. The monkey goby population displayed a relatively balanced sex ratio, while length-frequency distribution demonstrated two- (April), and later three (October), clearly visible peaks, representing three age classes. The condition factor of both males and females was influenced by season. We were able to estimate the starting time and the duration of the spawning season using both gonadosomatic index and ovarian histological analysis. Population of monkey goby in the Bulgarian Danube is an example of a stable native population defined by balanced sex ratio, three-year life span, and recruitment represented by strong cohort of 0+ fish, some of them maturing in their second year of life. Monkey goby is one of many Neogobius species that have invaded European waters in recent decades. Little interest has been paid to this species up till now, probably due to its lower rate of invasiveness compared to some other goby species, e.g., round goby. As with any non-native species, however, it represents a potential danger for native fauna. The aim of this study is to fill in the missing data concerning monkey goby biology and population structure in its native area of distribution, thereby providing a baseline for future comparative studies in non-native distribution areas. Samples of monkey gobies, Neogobius fluviatilis (Pallas, 1814), were obtained seasonally from the lower, Bulgarian stretch of the Danube River during 2006. The fish collected were sexed, measured, and weighed. After that the gonads were removed and weighed. These data were used to calculate sex ratio, length-frequency distribution, condition coefficient, and gonadosomatic index. Dissected ovaries were used for histological analysis of oocyte distribution. The monkey goby population displayed a relatively balanced sex ratio, while length-frequency distribution demonstrated two- (April), and later three (October), clearly visible peaks, representing three age classes. The condition factor of both males and females was influenced by season. We were able to estimate the starting time and the duration of the spawning season using both gonadosomatic index and ovarian histological analysis. Population of monkey goby in the Bulgarian Danube is an example of a stable native population defined by balanced sex ratio, three-year life span, and recruitment represented by strong cohort of 0+ fish, some of them maturing in their second year of life.
dcterms:title
Population structure, condition, and reproduction characteristics of native monkey goby, Neogobius fluviatilis (Actinopterygii: Perciformes Gobiidae), in the Bulgarian Danube Population structure, condition, and reproduction characteristics of native monkey goby, Neogobius fluviatilis (Actinopterygii: Perciformes Gobiidae), in the Bulgarian Danube
skos:prefLabel
Population structure, condition, and reproduction characteristics of native monkey goby, Neogobius fluviatilis (Actinopterygii: Perciformes Gobiidae), in the Bulgarian Danube Population structure, condition, and reproduction characteristics of native monkey goby, Neogobius fluviatilis (Actinopterygii: Perciformes Gobiidae), in the Bulgarian Danube
skos:notation
RIV/68081766:_____/12:00389477!RIV13-GA0-68081766
n9:predkladatel
n17:ico%3A68081766
n4:aktivita
n14:I n14:P
n4:aktivity
I, P(GAP505/11/1768)
n4:cisloPeriodika
4
n4:dodaniDat
n11:2013
n4:domaciTvurceVysledku
n15:8118663 n15:6271685
n4:druhVysledku
n16:J
n4:duvernostUdaju
n12:S
n4:entitaPredkladatele
n13:predkladatel
n4:idSjednocenehoVysledku
159685
n4:idVysledku
RIV/68081766:_____/12:00389477
n4:jazykVysledku
n18:eng
n4:klicovaSlova
monkey goby; invasion; Bulgaria; Danube, condition; GSI; ovary structure
n4:klicoveSlovo
n5:ovary%20structure n5:condition n5:Danube n5:GSI n5:invasion n5:monkey%20goby n5:Bulgaria
n4:kodStatuVydavatele
PL - Polská republika
n4:kontrolniKodProRIV
[3773A47388DE]
n4:nazevZdroje
Acta Ichthyologica et Piscatoria
n4:obor
n10:EH
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
2
n4:projekt
n8:GAP505%2F11%2F1768
n4:rokUplatneniVysledku
n11:2012
n4:svazekPeriodika
42
n4:tvurceVysledku
Konečná, Markéta Jurajda, Pavel
n4:wos
000314403500005
s:issn
0137-1592
s:numberOfPages
7
n19:doi
10.3750/AIP2012.42.4.05