scholarly journals Organochlorine contaminants (PCBs, DDTs, HCB & HBDE) in fish from the Lake Varna and Lake Beloslav, Bulgaria

2015 ◽  
Vol 26 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Stanislava Georgieva ◽  
Mona Stancheva ◽  
Lubomir Makedonski
Keyword(s):  
Fish Species ◽  
Aquatic Ecosystems ◽  
Neogobius Melanostomus ◽  
Grey Mullet ◽  
Mass Spectrometry Detection ◽  
Fish Tissues ◽  
Organochlorine Contaminants ◽  
In The Wild ◽  
Wet Weight ◽  
Indicator Pcbs

Abstract Concentrations of organochlorine compounds such as polychlorinated biphenyls (PCBs), DDT and its metabolites, hexachlorobenzene (HCB) and hexachlorobutadiene (HBDE) were determined in three fish species: goby (Neogobius melanostomus), golden grey mullet (Mugil auratus) and silverside (Atherina boyeri). Samples were collected from the Lake Varna and the Lake Beloslav in 2014. The edible fish tissues were analyzed in order to investigate the presence of pollutants in species from the lakes near Varna City, Bulgaria and compared the results to the levels in other aquatic ecosystems. The fifteen congeners of PCBs, HCB, HCBD, DDT and its two main metabolites DDE and DDD were determined by capillary gas chromatography system with mass spectrometry detection. The OCPs levels in the wild fish were found in the order DDTs > PCBs. The other contaminants HCB and HCBD were not detected or were below the analytical detection limit. Among the pesticides, essentially only the metabolites p, p’- DDE and p, p’- DDD were found. The concentrations of DDTs were determined from 2.66 to 17.97 ng/g wet weight and PCBs concentrations were found from 0.43 to 8.05 ng/g ww (in goby and golden grey mullet, respectively). The sum of the six Indicator PCBs did not exceed the European maximum limit 75 ng/g wet weight. The concentrations of DDTs and PCBs were found lower compared to those in similar fish species from other aquatic ecosystems.

POLYCHLORINATED BIPHENYLS IN EDIBLE FISH FROM BLACK SEA, BULGARIA

2017 ◽  
Author(s):  
Mona Stancheva ◽  
Mona Stancheva ◽  
Stanislava Georgieva ◽  
Stanislava Georgieva ◽  
Zlatina Peteva ◽  
...  
Keyword(s):  
Polychlorinated Biphenyls ◽  
Black Sea ◽  
Fish Species ◽  
Neogobius Melanostomus ◽  
Pollution Monitoring ◽  
Grey Mullet ◽  
Mass Spectrometry Detection ◽  
Black Sea Coast ◽  
Lipid Weight ◽  
Edible Fish

Polychlorinated biphenyls (PCBs) can still be a problem for the aquatic environment. Fish species are a suitable indicator for the environmental pollution monitoring because they concentrate pollutants in their tissues directly from water. Concentrations of PCBs were measured in marine fish, collected from Bulgarian Black Sea coast in order to monitor the dynamics of these pollutants in 2007, 2010 and 2015. The fish species: goby (Neogobius melanostomus), sprat (Sprattus sprattus sulinus), horse mackerel (Trachurus Mediterraneus ponticus) and grey mullet (Mugil cephalus) were chosen because of their characteristic feeding behavior. The PCBs were determined by gas chromatography system with mass spectrometry detection. The Total PCBs ranged from 93.8 to 513.3 ng/g lipid weight (in grey mullet and goby, respectively). Levels of PCBs in goby and grey mullet decreased in 2010 and 2015. In order to assess the safety of fish as food were calculated TEQ. They are determined by the results of dioxin - like (dl) PCBs. TEQs were calculated from 0.01 to 0.04 pg TEQ/g ww and did not exceed the EC limit of 3 pg TEQ/g ww. The levels of PCBs in fish from Bulgarian Black Sea were comparable to those found in neighboring seas.

POLYCHLORINATED BIPHENYLS IN EDIBLE FISH FROM BLACK SEA, BULGARIA

2017 ◽  
Author(s):  
Mona Stancheva ◽  
Mona Stancheva ◽  
Stanislava Georgieva ◽  
Stanislava Georgieva ◽  
Zlatina Peteva ◽  
...  
Keyword(s):  
Polychlorinated Biphenyls ◽  
Black Sea ◽  
Fish Species ◽  
Neogobius Melanostomus ◽  
Pollution Monitoring ◽  
Grey Mullet ◽  
Mass Spectrometry Detection ◽  
Black Sea Coast ◽  
Lipid Weight ◽  
Edible Fish

Polychlorinated biphenyls (PCBs) can still be a problem for the aquatic environment. Fish species are a suitable indicator for the environmental pollution monitoring because they concentrate pollutants in their tissues directly from water. Concentrations of PCBs were measured in marine fish, collected from Bulgarian Black Sea coast in order to monitor the dynamics of these pollutants in 2007, 2010 and 2015. The fish species: goby (Neogobius melanostomus), sprat (Sprattus sprattus sulinus), horse mackerel (Trachurus Mediterraneus ponticus) and grey mullet (Mugil cephalus) were chosen because of their characteristic feeding behavior. The PCBs were determined by gas chromatography system with mass spectrometry detection. The Total PCBs ranged from 93.8 to 513.3 ng/g lipid weight (in grey mullet and goby, respectively). Levels of PCBs in goby and grey mullet decreased in 2010 and 2015. In order to assess the safety of fish as food were calculated TEQ. They are determined by the results of dioxin - like (dl) PCBs. TEQs were calculated from 0.01 to 0.04 pg TEQ/g ww and did not exceed the EC limit of 3 pg TEQ/g ww. The levels of PCBs in fish from Bulgarian Black Sea were comparable to those found in neighboring seas.

scholarly journals The first unified inventory of non-native fishes of the South Caucasian countries, Armenia, Azerbaijan, and Georgia

2021 ◽  
pp. 32
Author(s):  
Tatia Kuljanishvili ◽  
Levan Mumladze ◽  
Bella Japoshvili ◽  
Namig Mustafayev ◽  
Shaig Ibrahimov ◽  
...  
Keyword(s):  
Black Sea ◽  
Fish Species ◽  
Caspian Sea ◽  
Native Species ◽  
Biological Diversity ◽  
Native Fish ◽  
The Black Sea ◽  
The South ◽  
In The Wild ◽  
Native Fishes

The South Caucasus (SC) region is recognized for its high biological diversity and various endemic animal taxa. The area has experienced many fish introductions over the years, but the overall information about non-native fishes in the three SC countries, Armenia, Azerbaijan, and Georgia did not exist. Although these three countries belong to the Kura River drainage, Caspian Sea basin (only the western half of Georgia drains into the Black Sea), the legislative framework for each country regarding introduction of non-native fish species and their treatment is different and poorly developed. The goal of the present study was to make an initial inventory of non-native fish species in the three SC countries, and summarize the existing knowledge as a basis for future risk assessment models and formulation of regional management policies. Here, we present a unified list of 27 non-native species recorded in the wild in Armenia, Azerbaijan, and Georgia. Among these 27 species, eight were translocated from the Black Sea basin to the Caspian Sea basin. Out of these 27 non-native fishes, 15 species have become established (three of them being considered invasive) and six fish species could not survive in the wild.

scholarly journals Gammarus-Microbial Interactions: A Review

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Daniel Nelson
Keyword(s):  
Leaf Litter ◽  
Aquatic Ecosystems ◽  
Poor Quality ◽  
Fungal Species ◽  
Microbial Interactions ◽  
Negative Effects ◽  
Freshwater Habitats ◽  
In The Wild ◽  
Survival And Growth ◽  
Organic Matter Fractions

Gammarusspp. are typically classified as shredders under the functional feeding group classification. In the wild and in the laboratory,Gammarusspp. will often shred leaves, breaking them down into finer organic matter fractions. However, leaf litter is a poor quality food source (i.e., high C : N and C : P ratios) and very little leaf material is assimilated by shredders. In freshwater habitats leaf litter is colonized rapidly (within ∼1-2 weeks) by aquatic fungi and bacteria, making the leaves more palatable and nutritious to consumers. Several studies have shown thatGammarusspp. show preference for conditioned leaves over nonconditioned leaves and certain fungal species to others. Furthermore,Gammarusspp. show increased survival and growth rates when fed conditioned leaves compared to non-conditioned leaves. Thus,Gammarusspp. appear to rely on the microbial biofilm associated with leaf detritus as a source of carbon and/or essential nutrients. Also,Gammarusspp. can have both positive and negative effects on the microbial communities on which they fed, making them an important component of the microbial loop in aquatic ecosystems.

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.

Cadmium effects onIchthyophthirius: evidence for metal-sequestration in fish tissues following administration of recombinant vaccines

Parasitology ◽  
2003 ◽  
Vol 126 (7) ◽  
pp. S87-S93 ◽  
Author(s):  
Y. BISHARYAN ◽  
Q. CHEN ◽  
M. M. HOSSAIN ◽  
A. PAPOYAN ◽  
T. G. CLARK
Keyword(s):  
Gene Promoter ◽  
Relative Survival ◽  
Parasite Load ◽  
Recombinant Vaccines ◽  
Fish Tissues ◽  
Metal Sequestration ◽  
Load Following ◽  
Significant Difference ◽  
Wet Weight

We are developingTetrahymena thermophilaas a delivery system for recombinant vaccines against parasitic protozoa, including the common fish parasite,Ichthyophthirius multifiliis. T. thermophilacell lines expressingI. multifiliisgenes under the control of a cadmium-inducible metallothionein gene promoter conferred strong protection against a lethal parasite challenge when administered parenterally to naïve fish. Nevertheless, given that heavy metals can be toxic to parasites, a question arose as to whether protection resulted from Cd residues carried over with the vaccine, rather than acquired immunityper se. To address this issue, we examined the sensitivity ofI. multifiliisto Cdin vitroand determined Cd concentrations in different host tissues following i.p. injection of juvenile channel catfish with the recombinant vaccine. We found that CdCl2at concentrations [ges ]50 ppb were lethal toI. multifiliistherontsin vitro. Furthermore, Cd concentrations were clearly elevated in fish tissues and reached levels equivalent to 74 ng/g wet weight (74 ppb) in the skin within 14 days of injection with recombinantT. thermophila. Nevertheless, fish injected with non-transformedTetrahymenagrown in the presence or absence of CdCl2showed no significant difference in either relative survival or parasite load following direct challenge withI. multifiliis.

scholarly journals Competition for shelter between four invasive gobiids and two native benthic fish species

2011 ◽  
Vol 57 (6) ◽  
pp. 844-851 ◽  
Author(s):  
N. Van Kessel ◽  
M. Dorenbosch ◽  
M.R.M. De Boer ◽  
R.S.E.W. Leuven ◽  
G. Van Der Velde
Keyword(s):  
Fish Species ◽  
Native Species ◽  
Habitat Choice ◽  
Neogobius Melanostomus ◽  
Limiting Factor ◽  
Significant Shift ◽  
Benthic Fish ◽  
Gobiid Fish ◽  
Preferred Habitat ◽  
Proterorhinus Semilunaris

Abstract Recent invasions by non-native gobiid fish species that are ongoing in the Western European rivers Rhine and Meuse, will lead to interactions with native benthic fish species. Since both non-native gobiids and native benthic species are bottom dwelling species with a preference for shelter during at least part of their life cycle, it is likely that competition for shelter will occur between these non-native and native species when shelter is a limiting factor. To investigate the importance of this mechanism for species replacements, various habitat choice experiments were conducted between two common native benthic fish species (Cottus perifretum and Barbatula barbatula) and four invasive non-native gobiid species (Proterorhinus semilunaris, Neogobius melanostomus, N. kessleri and N. fluviatilis). The first series of single specimen experiments determined the habitat choice of each individual fish species. In a second series of competition experiments, shifts in habitat choice in comparison with the previously observed habitat choice, were determined when a native benthic fish species co-occurred with non-native gobiid species. Native C. perifretum displayed a significant shift in habitat choice in co-occurrence with the gobiids N. kessleri or P. semilunaris. C. perifretum was outcompeted and moved from the available shelter place to less preferred habitat types. During the competition experiments no change in habitat choice of B. barbatula was shown. Our study therefore suggests that competition for shelter is likely to occur in rivers invaded by N. kessleri and P. semilunaris at sites where shelter is limiting.

Diets and trophic guilds of demersal fishes of the south-eastern Australian shelf

2001 ◽  
Vol 52 (4) ◽  
pp. 537 ◽  
Author(s):  
C. Bulman ◽  
F. Althaus ◽  
X. He ◽  
N. J. Bax ◽  
A. Williams
Keyword(s):  
Fish Species ◽  
Abundant Species ◽  
Trophic Guilds ◽  
The South ◽  
Important Species ◽  
Trawl Fishery ◽  
South Eastern ◽  
Total Fish ◽  
Wet Weight ◽  
Commercially Important

A total of 8200 stomach samples was collected from 102 fish species caught by trawl or gillnet during research surveys on the south-eastern Australian shelf from 1993 to 1996. Diet compositions were analysed based on percentages of wet weight of prey. Of the total fish examined, 70 species had sufficient stomach samples (i.e. >10) for further analysis. Ten trophic guilds were identified from cluster analysis. Benthic prey dominated the diets. However, analysis on a subset of 28 abundant species that were commercially and ecologically important, showed that pelagic prey was dominant, particularly for 12 quota species. This suggests that pelagic production contributes significantly to the trawl fishery production. Further analysis on the diets of these 28 species found that although fish was more important than invertebrate prey, there was no evidence of significant predation on commercially important species (quota species)by other fish species. A food web diagram was constructed, mostly based on the diet compositions, guild structure and relative abundance of commercially and ecologically important fish species, to show major trophic interactions of the shelf ecosystem.

scholarly journals Dezvoltarea unui complex mobil pentru reproducerea ecologo- industrial a speciilor pelagofile de pești în condiții de fluvii și lacuri

2021 ◽  
Author(s):  
Oleg Crepis ◽  
◽  
Dumitru Bulat ◽  
Elena Zubcov ◽  
Marin Usatii ◽  
...  
Keyword(s):  
Fish Species ◽  
Environmental Conditions ◽  
Aquatic Ecosystems ◽  
Anthropogenic Impact ◽  
Fish Stock ◽  
Basic Principles ◽  
Republic Of Moldova ◽  
Natural Reproduction ◽  
Productivity Management ◽  
The Republic

The populations of most fish species in the Republic of Moldova reproduce naturally, however, as a result of the increasing anthropogenic impact on aquatic ecosystems, the conditions for their natural reproduction have deteriorated significantly. In this context, one of the research objectives for 2020 was the development of efficient technological principles for conservation and rational use of local fish stock. It was revealed the ensuring of the development of the most vulnerable stages in the ontogenesis of fish in controlled environmental conditions is one of the basic principles of productivity management of Danube mackerel populations. In order to put into practice the principles of managing the productivity of breeding stocks, a mobile installation has been developed for the reproduction of pelagophilous fish species.

scholarly journals An Annotated List of the Fishes of the Western Basin of Lake Erie with Emphasis on the Bass Islands and Adjacent Tributaries

2016 ◽  
Vol 116 (2) ◽  
pp. 36
Author(s):  
Thomas P. Simon ◽  
Charles Boucher ◽  
David Altfater ◽  
Dennis Mishne ◽  
Brian Zimmerman
Keyword(s):  
Fish Species ◽  
Fish Assemblage ◽  
Native Species ◽  
Salmo Trutta ◽  
Lake Erie ◽  
Neogobius Melanostomus ◽  
Ctenopharyngodon Idella ◽  
Current Status ◽  
Fish Assemblage Structure ◽  
Western Basin

Fish assemblage structure has changed dramatically in the Western Basin of Lake Erie since Trautman’s revision of the Fishes of Ohio. Fish surveys near the Bass Islands and adjacent mainland tributaries documented fish faunal distributional patterns during the last three decades. Recent collections (n=1,719 sites) from 1982-2014 indicate that 123 fish species are extant and 27 species have been extirpated from the Bass Islands and nearby tributaries draining the western basin. Extirpation of Polyodon spatula, Alosa sapidissima, Moxostoma lacurum, and Sander glacum occurred; however, A. sapidissima and members of genus Oncorhynchus were introduced and unable to naturalize. Recent collection of A. fulvescens in Schoolhouse bay near Middle Bass Island in May 2012; Umbra limi populations on Middle Bass Island and Kelley’s Island; and Lepisosteus oculatus populations along the southeastern shoreline of North Bass Island are stable in Lake Erie despite increased eutrophication. The current Western Basin fish assemblage includes 107 native, 26 nonindigenous, and 6 alien fish species. Twenty-one native species have been extirpated from Lake Erie, while 6 nonindigenous species have not naturalized and have been extirpated. Six additional species known from within the Lake Erie basin have not been collected from the Western Basin during the study period and current status is unknown. Introduced non-indigenous and alien species are responsible for increased species richness including Neogobius melanostomus, Proterorhinus semilunaris, Salmo trutta, Carassius auratus, Cyprinus carpio, Ctenopharyngodon idella and four records for Hyphthalmichthys molatrix since 1981. Brief comments on distribution, relative abundance, and status are provided for each species. 

Sign in / Sign up

Export Citation Format

Share Document