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-Distribution of round goby Neogobius melanostomus in the southern Black Sea and the Sea of Marmara (black shadow area). [Distribution du gobie rond N. melanostomus dans le sud de la mer Noire et en mer de Marmara (figuré en noir).]
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Age and growth of the round goby Neogobius melanostomus (Pallas, 1814) were studied by examination of growth increments within otoliths of 868 specimens caught between October 2002 and March 2005 from offshore of Samsun city in the southern Black Sea. The values of intercept and slope in length-weight relationships were calculated as 0.0110 and 3.0...
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... the Black Sea and Caspian Sea, the Sea of Azov and Marmara and their tributaries are known as the native biogeographic range of this species. Though the map for European distribution of the round goby (Miller, 1986) indicates that this species does not exist along the southern shoreline of the Black Sea, it has a wide distribution in the region (Fig. 1). Kuru (1980) and Mater et al. (1989) reported its range along the whole Turkish coastline in the Black Sea and the Sea of Marmara at depths from 2-30 m. Geldiay and Balik (1996) represented a distribution map for this species including the lower to middle reaches of tributaries, freshwater lakes and lagoons in the Black Sea and Marmara ...
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... This commission is mostly concerned with turbot Scophthalmus maeoticus (Pallas, 1814), dogfish Squalus acanthias L., 1758, anchovy Engraulis encrasicolus (L., 1758), sprat Sprattus sprattus (L., 1758), horse mackerel Trachurus mediterraneus (Steindachner, 1868), red mullet (Mullus barbatus L., 1758) and whiting Merlangius merlangus (L., 1758) fisheries. In contrast, there has been little or no interest shown in the population status of gobies (Gobiidae) despite their local importance as a commercial fisheries species in the Black Sea, especially in Turkey and Bulgaria (Gümüş & Kurt 2009, Zarev et al. 2013, FAO 2020. In the recreational zone of the City of Odessa, e.g., anglers catch up to a tonne of gobies per day, even during the spawning period (Khutornoy 1998). ...
Using a mathematical model consisting of two modules, i.e. the Bayesian Schaefer Model and Length-based Bayesian Biomass, the state of the commercial stocks of the round goby Neogobius melanostomus in the Gulf of Odessa (Black Sea, Ukraine) is studied for the period 2009–2020. The results of the analysis are compared with the quantitative population parameters of the Mediterranean blue mussels Mytilus galloprovincialis around the coast of Odessa. The results show that (i) round goby stocks in the study area are now critically low and (ii) there was a noticeable decrease in mussel abundance and biomass in recent years off the coast of Odessa. These data suggest that when the biomass of mussels shorter than 20 mm decreases, the commercial stocks of round goby are reduced in the subsequent year.
... A balanced sex ratio is more common for stable, native (Kovtun 1978, 1980, Aydin 2021 or long-established invasive populations (Hempel et al. 2012, Azour et al. 2015. Controversially, some studies have reported that males were more abundant than females in both the native (Gözler et al. 2003, Gümüş & Kurt 2009 and invasive range of N. melanostomus (Corkum et al. 2004, Tomczak & Sapota 2006. A female-biased sex ratio was observed in an isolated round goby population in the upper Elbe (Janáč et al. 2019). ...
Reproductive traits are among the most important biological characteristics that facilitate or impede the establishment of non-native fish into new environments. In several tributaries of the Lower River Danube (Bulgaria), the round goby (Neogobius melanostomus Pallas, 1814) is a recent invader. Specimens from the edge of the invasion front were collected monthly (March 2017 to May 2018) from each river. The pioneer individuals displayed relatively small body sizes. First maturation of females occurs at 49 mm total length. Based on the dynamics of oocyte size and GSI, it was established that spawning begins in early spring, at a relatively low water temperature (6-7 °C). The breeding season extended from March to June. Average absolute fecundity was 162 ± 62 oocytes, while average relative fecundity was 94 oocytes/g ± 24. Female fecundity is linearly dependent on the length and weight. Both of the known male alternative reproductive tactics were observed. Body condition factor was lowest during April for both sexes. The relationship between reproductive traits and invasive potential in N. melanostomus is discussed.
... The sex composition is expected close 1:1 due to various reasons such as differences of natural and fishing mortality on sexes, spawning migration and, size and habitat differences between sexes (Nikolskii, 1980). Previous studies on population of N. melanostomus reported that male individuals were more abundant than female ones (Skora and Stolarski, 1996;Gözler et al., 2003;Gümüş and Kurt, 2009) as parallel to this study, that was found 1:1.77. ...
... While average length of female was 13.55 cm, it was 15.78 cm for males. Previous studies also concluded the similarly (Gümüş andKurt, 2009, Skora andStolarski, 1996). Skora and Stolarski (1996) reported that males reached 21.2 cm when they are four years old. ...
Round goby (Neogobius melanostomus, Pallas 1814) which belongs to Gobiidae, inhabits in the Black Sea, the Marmara Sea, the Caspian Sea and the rivers that flows into fore stated seas. The main population parameters, such as age, length, sexual composition, length-weight relationship, growth, condition factor, gonadosomatic index and reproduction of N. melanostomus were investigated from coasts of the southern Black Sea in this study. A total of 2408 individuals were sampled between July 2017 and June 2018. Results showed that average length and weight were found 14.97 cm (10.50-26.20) and 43.90 g (15.28-212.2), respectively. Sex ratio between female and male was found 1:1.77 (P>0.05). Age of samples varied between one and eight years old. The von Bertalanffy growth parameters were calculated as L∞ = 26.5 cm, k = 0.1980 year-1 and t0 = -1.3487 year for all individuals. The length-weight relationship was found as W = 0.0069 TL3.1972 for all individuals. Total mortality, natural mortality, fishing mortality, growth performance index and condition factor were calculated as 0.625, 0.479, 0.145, 2.143, and 1.66, respectively. Spawning occurs between March and May and the maximum value of gonadosomatic index reached in April. Average relative fecundity was 318.88 number/g (124.8-958.9), while average diameter of eggs was found 2025.58 µm ± 262.86 (1112.0-2703.4). This study will contribute for information gap on the species as well as provide information source for future studies.
... Understanding life-history characteristics, such as growth and age structure, is vital for evaluating long-term effects of invaders on food webs and for developing practical management techniques for the control of invaders (Veitch and Clout, 2002). Previous studies on round goby age and growth within invaded ecosystems indicated that size within an age group was highly variable and males grew faster and attained a larger maximum size than females Corkum, 2000a, 2000b;Phillips et al., 2003;French and Black, 2009;Gümüs and Kurt, 2009;Taraborelli et al., 2010;Sokołowska and Fey, 2011;Huo et al., 2014;Duan et al., 2016). Furthermore, life-history characteristics were found to vary over time and space. ...
Although the round goby Neogobius melanostomus has become established throughout the Laurentian Great Lakes, a multi-model inference (MMI) approach toward characterizing round goby growth in the Laurentian Great Lakes has yet to applied using otolith-derived data. Further, spatial variation in round goby growth among lakes has yet to be investigated. For each sex, growth of round gobies at three locations of Lake Michigan and four locations of Lake Huron was investigated using MMI, based on information theory, with three candidate growth models. These three growth models included the von Bertalanffy model, the Gompertz model, and the logistic model. The von Bertalanffy model was most often selected (13 out of 14 cases) as the ‘best’ model among all candidate models, followed by the logistic model. None of the best models were strongly supported as a ‘clear winner’. At least one additional model was supported by the data in each of the 14 cases, indicating that there is a substantial degree of uncertainty in model selection. When model selection uncertainty was ignored, standard errors of growth parameters were underestimated in 8 of the 14 cases. Overall, round gobies in Lake Michigan attained larger sizes at age and grew faster than in Lake Huron. Based on multi-model inference, our study provided a robust assessment of round goby growth, which will be essential in better managing sport fisheries in both lakes.
... Morphometric sagitta variables (length -OL and width -OWi) were measured using a Nikon SMZ 1000 microscope coupled with ToupViev 3.7 image analysis software at a magnification of 20× under reflected light against a dark background. The total otolith length (OL) was determined by measuring the distance between the posterior and anterior tips of the otolith along the central core, whereas otolith width (OWi) was measured along the dorsoventral axis to the nearest 0.01 mm (Gümüş & Kurt, 2009). ...
... The length and width of lapillus and asteriscus otoliths from selected individuals of N. melanostomus, with relationship between their length and width, are presented in Table 9. Figure 13 shows the effect of fish length on the shape of asteriscus and lapillus, with low negative correlation for asteriscus (−0.134) and higher positive correlation (0.776) for lapillus. inhabit deeper zones and exhibit more nocturnal activity (Gümüş & Kurt, 2009;Sokołowska & Fey, 2011). Analysing otoliths retrieved from the stomachs or faeces of piscivorous predators can provide information on the type, size, mass and energy content of their fish prey. ...
... OL. In fish from the southern Black Sea (caught at depths of 30-150 m), Gümüş and Kurt (2009) reported a strong relationship between fish and T A B L E 5 Comparisons of each -to each sagitta's shape (in percentage) in length class 5 Note: Shaded area of sagittathe least similar otoliths in length class 5. otolith growth rates with no significant differences between males and females. Similarly, Sokołowska and Fey (2011) found clear relationships among otolith size variables and total fish length in N. melanostomus from the Gulf of Gda nsk with no differences between the sexes. ...
Round goby Neogobius melanostomus (Pallas 1814) has become a significant component in the diet of piscivorous fish from the Pomeranian Bay (Bornholm Basin, Baltic Sea). Proper identification of fish species in the diet of predators is significant in biological studies of fish and other aquatic animal species, and, with regard to N. melanostomus, it is important to the knowledge of trophic web structures in areas this species has invaded. A total of 142 individuals of N. melanostomus, measuring 16–174 mm standard length, were examined. Seventy‐two fishes were caught during monitoring surveys in fishing grounds, whereas 70 were found in the stomachs of European perch Perca fluviatilis, pike‐perch Sander lucioperca and Baltic cod Gadus morhua. The objective of the present study was to analyse the sagittal otoliths to identify variations in outer shape with increases in fish length; expand and correct descriptions of the sagitta, lapillus and asteriscus otoliths; and evaluate the relationships among otolith dimensions and fish standard length. The otoliths were described morphologically. The analysis of the outer shape of sagittal otoliths using Fourier analysis and multivariate statistics exhibited great phenotypic variability that was associated with fish length, including within pairs in individuals and/or among individuals in length classes. In addition, the asterisci and lapilli of N. melanostomus from selected specimens, which were described for the first time with regard to fish length, were found to be less variable compared to sagittal otoliths. This study presents the first analysis of intrapopulation phenotypic plasticity of N. melanostomus sagittal otolith morphology as it is linked to fish size.
... Translucent zone is characterized by less calcium carbonate rich and contain more concentrated proteins than opaque zone . The slower growth can be due to seasonal fluctuations in the water level, the photoperiod, the quality of the available food, a reduction in feeding activity, gonad maturation or spawning activity/behaviour (Yosef and Casselman, 1995;Jepsen et al., 1999;Gümüş and Kurt, 2009). In southeastern China, Liu et al. (2015) indicated an increase in the gonadosomatic index between January and April for a population of H. macrolepidota with a peak in June and a decrease in July. ...
... These age groups experienced a high variability in lengths, indicating a strong variability in growth. This observation could be explained by the fact that numerous populations of tropical fishes are able to reproduce all year (Gómez-Márquez, 1998;Bwanika et al., 2007;Gümüş and Kurt, 2009). A long reproduction period over the year can generate different growth rates due to seasonal changes of environmental conditions and due to a mixing of cohorts (Jiménez-Badillo, 2006). ...
The life history traits of Hampala macrolepidota, a common freshwater fish species in Southeast Asia that is of interest for fisheries and sport fishing, were estimated for a population from Nam Theun 2 Reservoir in Lao. The exploitation status of this species was also characterized using data from landing. Toluidine-stained transverse section of otoliths from 450 specimens, collected between November 2015 and January 2017 (by experimental gillnet fishing and landing surveys), were analysed to identify the periodicity of annulus formation and to age individuals. Length, weight, sex and sexual maturity stage were recorded. Life history traits were characterized by length-weight and length-age relationships. The periodicity of annulus formation was annual, with complete formation of the translucent zone at the end of the warm and dry season and the beginning of the warm and wet season (May-June). The length at first sexual maturity of females was estimated to occur at a standard length of 212 mm and at 3.3 years old (50% of matured females). The condition factor, which was between 1.04 and 1.09, was lower than for other studied populations. H. macrolepidota in the Nam Theun 2 Reservoir had a relatively slow growth (0.24 yr-1) with a relatively short lifespan (maximum age of approximately 9 years old). The species exploitation in the reservoir mainly concerned individuals that had a standard length between 120 and 220 mm, meaning that 67% of landed individuals did not have time to reproduce before capture. The exploitation rate was 0.87, and according to the probability of capture, individuals had 50% chances of being caught after 182.5 mm, preventing them from taking part in the stock renewal. The present study suggests that the H. macrolepidota population in the reservoir is overexploited. These new findings should be considered for further improvements in fishery management and the sustainability of fisheries.
... Sillago schomburgkii, Acanthopagrus butcheri and Platycephalus westraliae (Hyndes and Potter, 1997;Sarre and Potter, 2000;Coulson et al., 2017). The use of marginal increment analysis to validate growth zones formation is consistent with the results for other gobiids (Gumus and Kurt, 2009;Sokołowska and Fey, 2011;Hajji et al., 2013). ...
... Sex-based differences in growth and size have been noted in several goby species and are attributed to differences in the cost of gamete production, parental care, mating systems and sexual selection (Hernaman and Munday, 2005). The larger maximum sizes displayed by male A. pflaumii are a typical feature of most gobiid species, such as the Aphia minuta, Zosterisessor ophiocephalus and N. melanostomus (La Mesa, 1999;Gumus and Kurt, 2009;Hajji et al., 2013). As gobiids are typically polygynous, the larger size attained by males is thought to aid in attracting multiple female mates and in parental care activities, such as guarding and fanning nests (Miller, 1984;Lindström and Hellström, 1993;Hernaman and Munday, 2005). ...
The gobiid Acentrogobius plflaumii, native to estuaries and coastal embayments in East Asia, has recently established a population in the warm-temperate Swan-Canning Estuary (SCE) in southwestern Australia. Data from 432 individuals demonstrated that although A. pflaumii was shown to live for ∼4 years, the age composition was dominated by 0+ and 1+ individuals. The maximum size of female (94 mm) and male (96 mm) A. pflaumii in the SCE is 33% larger than in its native habitat. Acentrogobius plflaumii grew rapidly, attaining a length of ∼65 mm, i.e. 84 and 87% of their TL∞’s of 77.3 and 72.9 mm for females and males, respectively, within the first year of life. Gonadosomatic indices, trends in monthly gonadal development and histological examination of gonads indicate that, although peak spawning in the SCE occurs over a similar period and season as in South Korean waters, spawning is more protracted in the SCE. Two discrete modes in oocyte diameter frequencies indicate this species exhibits determinate fecundity. The protracted spawning period enables batches of eggs to be released periodically during favourable conditions. These biological traits are likely to have aided in the successful colonisation of this species in the SCE. Quantifying the phenotypic plasticity of this non-indigenous species may inform risk assessments and subsequent management plans to mitigate the effect of A. pflaumii in the SCE and predict the likelihood of it colonising other southwestern Australian estuaries.
... В более поздней статье М. К. Апанасенко [1973] показала, что у самок бычка-кругляка из Чёрного моря максимальный возраст составлял 7+. О максимальном возрасте черноморского бычкакругляка в семь лет говорится в статье Н. Касапоглу [Kasapoğlu, 2016], хотя в 2009 г. у бычка-кругляка южной части Чёрного моря отмечено только 5 возрастных групп [Gümüs, Kurt, 2009]. Среди всех представителей семейства Gobiidae, встречающихся в уловах ставных орудий лова в Керченском проливе, бычоккругляк занимает доминирующее положение, его доля среди других бычков составляет от 14,6 до 59,4 % по численности (см. ...
... Although males may not be capable of rapidly switching between tactics, it is currently not known if the two tactics represent sequential or fixed strategies. Second, numerous previous studies of N. melanostomus have revealed considerable variation in body size within age classes (Duan et al., 2016;French & Black, 2009;Gümüs & Kurt, 2009;Huo et al., 2014;MacInnis & Corkum, 2000;Sokołowska & Fey, 2011). Unfortunately, none of these previous studies accounted for the presence of male alternative reproductive tactics. ...
... For example, accounting for this variation is important when attempting to use otolith morphology to infer specific details about individual fish, such as their body size. Furthermore, it has been common practice for studies to estimate N. melanostomus size at age by using back-calculation techniques (Duan et al., 2016;French & Black, 2009;Gümüs & Kurt, 2009;Huo et al., 2014;MacInnis & Corkum, 2000;Sokołowska & Fey, 2011), the present study suggests that the efficiency of these techniques could be improved by considering guarder males separately from sneaker males. While alternative tactics are widespread among fishes and anthropogenic effects on aquatic ecosystems are a growing concern, their effects on otolith morphology have only rarely been studied. ...
Round goby Neogobius melanostomus sagittal (saccular) otolith morphology was compared between males of the two alternative reproductive tactics (termed guarder and sneaker males) and between males captured from sites of high and low contamination. Otolith size increased with fish size and also displayed an ontogenetic shift in shape, becoming relatively taller as otoliths grew in size. Despite a considerable overlap in age between males adopting the two reproductive tactics, size‐at‐age measurements revealed that guarder males are significantly larger than sneakers at any given age and that they invest more into somatic growth than sneaker males. Controlling for body size, sneaker males possessed heavier sagittal otoliths than guarder males. Subtle otolith shape differences were also found between the two male tactics and between sites of high and low contaminant exposure. Sneaker males had relatively shorter otoliths with more pronounced notching than guarder males. Fish captured at sites of high contamination had otoliths showing slower growth rates in relation to body size and their shapes had more pronounced caudal points and ventral protrusions when compared with fish captured at sites of low contamination. The results are discussed in relation to life‐history tradeoffs between the male tactics in terms of reproductive and somatic investment as well as the putative metabolic costs of exposure to contaminants. Overall, this study reveals that male alternative reproductive tactics and environmental contaminants can have small, yet measurable, effects on otolith morphology and these factors should be accounted for in future research when possible.
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... Otoliths were used to determine age. Age was read from annual rings on otoliths (right and left sides of the otolith) in compliance with a method suggested by GÜMÜŞ and KURT [2009]. ...
The 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.
