scholarly journals Condition and population structure of the round goby (Neogobius melanostomus Pallas, 1811) in Szczecin Lagoon in 2010–2014

2018 ◽  
Vol 37 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Przemysław Czerniejewski ◽  
Adam Brysiewicz
Keyword(s):  
Population Structure ◽  
Fish Species ◽  
Round Goby ◽  
Neogobius Melanostomus ◽  
Fish Sample ◽  
Invasive Fish ◽  
Szczecin Lagoon ◽  
Mean Values ◽  
The World ◽  
Lagoon Environment

AbstractThe round goby (Neogobius melanostomus Pallas, 1811) is one of the most invasive fish species in the world, including Poland. 300 fish of this species were collected in the waters of Szczecin lagoon between 2010 and 2014 and examination of the size, sex and age structures of the population and of the condition of the fish was performed. Total length and standard length of all the collected fish amounted to 149.2 mm (±42.21) and 128.1 mm (±38.65), respectively. The age structure of the fish consisted of nine generations, with clear prevalence of the fish aged 3+ and 4+. Mean values of condition factors for the whole fish sample amounted to 0.20 (±0.02). However, no statistically significant differences in particular years were observed (ANOVA, p > 0.05), but the condition of the fish between 2010 and 2011 was slightly higher than between 2013 and 2014. The obtained results indicate that the Szczecin Lagoon environment provides this species with favourable living conditions and it can be stipulated that the quantity of individuals of this fish species will increase.

scholarly journals Feeding ecology and niche overlap of Lake Ontario offshore forage fish assessed with stable isotopes

2018 ◽  
Vol 75 (5) ◽  
pp. 759-771 ◽  
Author(s):  
James A. Mumby ◽  
Timothy B. Johnson ◽  
Thomas J. Stewart ◽  
Edmund A. Halfyard ◽  
Brian C. Weidel ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Fish Species ◽  
Round Goby ◽  
Lake Ontario ◽  
Niche Overlap ◽  
Neogobius Melanostomus ◽  
Forage Fish ◽  
Isotopic Niche ◽  
Ecosystem Structure ◽  
Rainbow Smelt

The forage fish communities of the Laurentian Great Lakes continue to experience changes that have altered ecosystem structure, yet little is known about how they partition resources. Seasonal, spatial, and body size variation in δ13C and δ15N was used to assess isotopic niche overlap and resource and habitat partitioning among the five common offshore Lake Ontario forage fish species (n = 2037; alewife (Alosa pseudoharengus), rainbow smelt (Osmerus mordax), round goby (Neogobius melanostomus), and deepwater (Myoxocephalus thompsonii) and slimy (Cottus cognatus) sculpins). Round goby had the largest isotopic niche (6.1‰2, standard ellipse area), followed by alewife (3.4‰2), while rainbow smelt, slimy sculpin, and deepwater sculpin had the smallest and similar niche size (1.7‰2–1.8‰2), with only the sculpin species showing significant isotopic niche overlap (>63%). Stable isotopes in alewife, round goby, and rainbow smelt varied with location, season, and size, but did not vary in the sculpin species. Lake Ontario forage fish species have partitioned food and habitat resources, and non-native alewife and round goby have the largest isotopic niche, suggestive of a boarder ecological niche, and may contribute to their current high abundance.

Reproductive female round gobies (Neogobius melanostomus) are attracted to visual male models at a nest rather than to olfactory stimuli in urine of reproductive males

Behaviour ◽  
2010 ◽  
Vol 147 (1) ◽  
pp. 121-132 ◽  
Author(s):  
Stan Yavno ◽  
Lynda Corkum
Keyword(s):  
Round Goby ◽  
Neogobius Melanostomus ◽  
Visual Signals ◽  
Invasive Fish ◽  
Reproductive Female ◽  
Olfactory Stimuli ◽  
Reproductive Male ◽  
Round Gobies ◽  
Male Model ◽  
Reproductive Females

AbstractFish are known to communicate in many ways and commonly use olfactory and visual signals. When round goby (Neogobius melanostomus) males become reproductive, they change from mottled grey to black and release sex steroids in their urine. In this study, we conducted a laboratory experiment to determine if reproductive female round gobies were attracted to a combination of olfactory (urine) and visual (silicone models) stimuli, representing reproductive and non-reproductive male round gobies. Females spent significantly more time at a nest with a black reproductive male model compared with a mottled non-reproductive male model. Neither urine type nor the interaction between model type and urine affected the time spent by reproductive females at a nest. Knowledge of the reproductive habits of the round goby may enable researchers to develop a method of species control for this invasive fish by manipulating its breeding habits.

Invasive male round gobies (Neogobius melanostomus) release pheromones in their urine to attract females

2013 ◽  
Vol 70 (3) ◽  
pp. 393-400 ◽  
Author(s):  
Keith B. Tierney ◽  
Matthew Kereliuk ◽  
Yogesh Kumar Katare ◽  
Alexander P. Scott ◽  
Stephen J. Loeb ◽  
...  
Keyword(s):  
Previous Investigation ◽  
Sensory Deprivation ◽  
Round Goby ◽  
Neogobius Melanostomus ◽  
Laurentian Great Lakes ◽  
Invasive Fish ◽  
Behavioural Responses ◽  
Round Gobies ◽  
Reproductive Females ◽  
Free Steroid

The round goby (Neogobius melanostomus) is an invasive fish in the Laurentian Great Lakes and beyond. Pheromones appear to be important for their reproductive success, as females are attracted to water in which reproductive males have resided (“conditioned water”). Previous investigation has shown conjugated and unconjugated forms of 3α-hydroxy-5β-androstane-11,17-dione (11-oxo-etiocholanolone; 11-O-ETIO) are released in the urine of these males. The goal of this study was to determine if the urine of reproductive males and fractionated extracts attract females. We found that reproductively active females were attracted to male urine and to isolates of male-conditioned water that contained conjugated 11-O-ETIO. The fractionated preparation that corresponded to unconjugated 11-O-ETIO (i.e., “free” steroid released via the gills of males) was not attractive to reproductive females, but curiously, it was attractive to nonreproductive females. Olfactory sensory deprivation confirmed that the behavioural responses were mediated by olfaction. These findings take us closer towards identifying the pheromone(s) that attract female gobies and, therefore, closer to having a method to limit this species' damaging invasion.

scholarly journals Detection of koi herpesvirus (KHV) and carp oedema virus (CEV) in invasive round goby, Neogobius melanostomus Pallas, 1814, from Poland and Germany

2020 ◽  
Vol 64 (2) ◽  
pp. 247-251
Author(s):  
Yeonhwa Jin ◽  
Natalia Adamkowska ◽  
Jolanta Kiełpińska ◽  
Sven Michael Bergmann
Keyword(s):  
Round Goby ◽  
Neogobius Melanostomus ◽  
Ecological Niches ◽  
Szczecin Lagoon ◽  
Transmission Potential ◽  
Koi Herpesvirus ◽  
Active Virus ◽  
Virus Transfer ◽  
Specific Pathogen ◽  
Round Gobies

AbstractIntroductionThe aim of the study was to determine the transmission potential of carp edema virus (CEV) and koi herpesvirus (KHV) introduced to Europe by the invasive round goby (Neogobius melanostomus).Material and MethodsA total of 70 round goby specimens were collected from the Szczecin Lagoon, Poland, and locations in Germany in the third and fourth quarters of 2018. The fish were analysed to detect KHV and CEV by PCR.ResultsSix fish specimens were positive for the presence of KHV, while none of the gobies examined showed the presence of CEV.ConclusionThe CEV genome was detected in the goby specimens from Germany and from Poland. Considering the high pace of the spread of the round goby and its effectiveness in acquisition of new ecological niches, it should be kept out during refilling of carp ponds. Further studies should focus on experimental cohabitation of CEV-infected round gobies and specific-pathogen-free (SPF) carp to investigate the potential for active virus transfer.

Response to putative round goby (Neogobius melanostomus) pheromones by centrarchid and percid fish species in the Laurentian Great Lakes

2013 ◽  
Vol 39 (1) ◽  
pp. 186-189 ◽  
Author(s):  
Cory L. Ochs ◽  
Alyson J. Laframboise ◽  
Warren W. Green ◽  
Alfred Basilious ◽  
Timothy B. Johnson ◽  
...  
Keyword(s):  
Great Lakes ◽  
Fish Species ◽  
Round Goby ◽  
Neogobius Melanostomus ◽  
Laurentian Great Lakes

scholarly journals The Study of External Pathologies in Fish of the South‐Western Coast of the Black Sea

2020 ◽  
Vol 15 (1) ◽  
pp. 118-129
Author(s):  
T. V. Gavruseva
Keyword(s):  
Fish Species ◽  
Round Goby ◽  
Health Assessment ◽  
Common Species ◽  
Neogobius Melanostomus ◽  
The Black Sea ◽  
Western Coast ◽  
Assessment Index ◽  
The Individual ◽  
Liver Changes

Aim. The aim of our investigation was to study the possibility of using the visual pathologies of fish as biomarkers of pollution to identify those fish species most sensitive in this way as biological monitors in assessing the ecological state of Sevastopol waters.Material and Methods. 461 specimens of eleven common species of fish from the waters of Sevastopol were subjected to external examination and dissection in 2018. A semi‐quantitative gradation of the identified pathologies was conducted using the Health Assessment Index (HAI).Results. Twenty three types of visual pathology were recorded. Abnormalities in the skin and gills, fin alterations, skeletal deformities, pathologies of liver, spleen and gonads and parasitic invasions were noted. Analysis of external anomalies using the Health Assessment Index (HAI) revealed that the most potentially indicative species for visual biomonitoring were the following demersal fishes: knout goby Mesogobius batrachocephalus Pallas, 1814, round goby Neogobius melanostomus Pallas, 1814 and East Atlantic peacock wrasse Symphodus tinca Linnaeus, 1758. Liver changes detected in these three fish species may indicate chronic exposure and reaction to xenobiotics and the presence of ectoparasites would indicate a weakening of the immune status of the individual specimens studied.Conclusions. Pathological studies of fish in Sevastopol’s coastal zone indicated that the condition of their organs and tissues is related to environmental factors and that there are sensitivities to habitat pollution. The results of the study are of interest in the future development of monitoring programs for bioassays and bioindication of hydrobionts using fish as biomarkers.

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