Fig 2 - uploaded by Eliza Uzunova
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Photos of collected fish species: a. Chaenocephalus aceratus (TL= 56 cm); b. Notothenia rossii (TL 30 cm); c. Notothenia coriiceps (TL 37 cm); d. Trematomus tokarevi (TL 18 cm); e. Trematomus nicolai (TL 7.5 cm). Remarks: a, d, e -photo of fishes fixed in formaldehyde solution; b, c -live individuals.
Source publication
https://acta-zoologica-bulgarica.eu/2021/002394.pdf
The survey on the fish fauna of the coastal area of South Bay, Livingston Island, was conducted in No-vember 2018-January 2019. Fish were caught by bottom trawl net and fishing rod. Five fish species have been identified: Notothenia coriiceps Richardson, 1844, N. rossii Richardson, 1844, Trematom...
Context in source publication
Context 1
... belonged to the suborder Notothenioidei. Four of the collected species belonged to the family Nototheniidae: Notothenia coriiceps Richardson, 1844, Notothenia rossii Richardson, 1844, Trematomus tokarevi Andriashev, 1978, Trematomus nicolai (Boulenger, 1902; one species belonged the family Channichthyidae -Chaenocephalus aceratus (Lönnberg, 1906) (Fig. 2). The black rockcod N. coriiceps and marbled rockcod N. rossii were the most numerous species. These two species were caught on Site 1. The total length (TL) of N. coriiceps varied from 300 to 330 mm and the TL of N. rossii -from 180 to 310 mm (Table 1). The stomach contents included mainly small crustaceans (Amphipoda and Euphausiacea) ...
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Citations
... Samples were collected in the South Bay of Livingston Island, specifically at Hannah Point, Miers Bluff Point and nearshore close to the Bulgarian Antarctic base St. Kliment Ohridski research station, during January 2011 (austral summer). Specimens of E. superba (n = 62, pooled samples) were collected from the stomachs of dissected P. papua and P. antarcticus, and from black rockcod Notothenia coriiceps and marbled rockcod N. rossii, two common fish species in this region (Uzunova et al., 2020). Rockcod fish specimens were collected by pole fishing at the South Bay, near the research station. ...
Under the climate change context, warming Southern Ocean waters may allow mercury (Hg) to become more bioavailable to the Antarctic marine food web (i.e., ice-stored Hg release and higher methylation rates by microorganisms), whose biomagnification processes are poorly documented. Biomagnification of Hg in the food web of the Antarctic Peninsula, one of world's fastest warming regions, was examined using carbon (δ¹³C) and nitrogen (δ¹⁵N) stable isotope ratios for estimating feeding habitat and trophic levels, respectively. The stable isotope signatures and total Hg (T-Hg) concentrations were measured in Antarctic krill Euphausia superba and several Antarctic predator species, including seabirds (gentoo penguins Pygoscelis papua, chinstrap penguins Pygoscelis antarcticus, brown skuas Stercorarius antarcticus, kelp gulls Larus dominicanus, southern giant petrels Macronectes giganteus) and marine mammals (southern elephant seals Mirounga leonina). Significant differences in δ¹³C values among species were noted with a great overlap between seabird species and M. leonina. As expected, significant differences in δ¹⁵N values among species were found due to interspecific variations in diet related to their trophic position within the marine food web. The lowest Hg concentrations were registered in E. superba (0.007 ± 0.008 μg g⁻¹) and the highest values in M. giganteus (12.090 ± 14.177 μg g⁻¹). Additionally, a significant positive relationship was found between Hg concentrations and trophic levels (reflected by δ¹⁵N values), biomagnifying nearly 2 times its concentrations at each level. Our results support that trophic interaction is the major pathway for Hg biomagnification in Southern Ocean ecosystems and warn about an increase in the effects of Hg on long–lived (and high trophic level) Antarctic predators under climate change in the future.
... Later Beltcheva et al. (2011) published brief information about the body length and weight as well as the diet composition of the same species. Recently, Uzunova et al. (2021) reported the found of five fish species in the coastal area around the Bulgarian base, without giving information on their biology and ecology. No specific research has been conducted so far on the biological parameters of the fish in the shelf waters of the South Bay, Livingston Island. ...
... Macroalgal environments are rich in prey and possible shelters from potential predators, such as cormorants, penguins and seals. The bottom substrate in the South Bay, where our survey was conducted, was dominated by rocks overgrown with abundant seaweeds, mainly of the brown algae Desmarestia menziesii and Himantothallus grandifolius (Uzunova et al. 2021). One of the sampling localities represented a strongly closed cove separated from the sea by an underwater rocky wall with sandy-gravel bottom substrate and fewer macroalgae. ...
The study presents data about the two dominant fish species Notothenia rossii Richardson, 1844 and N. coriiceps Richardson, 1844 in the shallow coastal waters of the Livingston Island. Length-weight relationship , as well as the Fulton's and the relative condition factors and the diet of both species were studied. A total of 115 specimens of N. rossii and 18 of N. coriiceps were caught near the Bulgarian Polar Base in the South Bay. The average total length and weight of N. rossii were 232.8 mm and 180.4 g, respectively , while in N. coriiceps they were 324.4 mm and 556.8 g. The exponent b values of the length-weight relationship in both species were close to 3, indicating an isometric growth, but not statistically different from 3 since the calculated p-value was above 0.05. The average values of the Fulton's and the relative condition factors in N. rossii were 1.32 and 1.65, respectively, while the values of the same factors in N. coriiceps were 1.50 and 2.10, respectively, which indicated very good general condition of the fish. Overall , ten dietary classes were recorded in N. rossii and five in N. coriiceps, but only two of them (krill and amphipods) formed a total of 84.1% and 79.3% of the species diet, respectively.
