scholarly journals МИКРОФЛОРА ЛЕЩА ABRAMIS BRAMA (LINNAEUS, 1758) ОЗЕРА ВИШТЫНЕЦКОГО В ЛЕТНИЙ ПЕРИОД 2020 Г.

2021 ◽  
pp. 19-19
Author(s):  
Я. В. Мирошниченко ◽  
Е. В. Авдеева
Keyword(s):  
Abramis Brama

С целью изучения микрофлоры леща оз. Виштынецкого, исследованием которого ранее никто не занимался, произведен микробиологический анализ его кожи, жабр и внутренних органов. Обнаружено доминирование в бактериоценозе леща оз. Виштынецкого бактерий рода Bacillus. Результаты наших исследований были сравнены с данными по микрофлоре леща Куршского залива, полученными сотрудником АтлантНИРО Н. Н. Чукаловой – выявлены различия в видовом и количественном составе бактерий изучаемых водоемов и количестве представителей условно-патогенной микрофлоры.

scholarly journals Cyanobacteria, cyanotoxins, and their histopathological effects on fish tissues in Fehérvárcsurgó reservoir, Hungary

2021 ◽  
Vol 193 (9) ◽  
Author(s):  
Damjana Drobac Backović ◽  
Nada Tokodi ◽  
Zoran Marinović ◽  
Jelena Lujić ◽  
Tamara Dulić ◽  
...  
Keyword(s):  
Adverse Effects ◽  
Fish Tissue ◽  
Freshwater Ecosystems ◽  
Abramis Brama ◽  
Histopathological Changes ◽  
Fish Tissues ◽  
The World ◽  
Encoding Gene ◽  
Microcystis Wesenbergii ◽  
Histopathological Effects

AbstractCyanobacteria are important members of lake plankton, but they have the ability to form blooms and produce cyanotoxins and thus cause a number of adverse effects. Freshwater ecosystems around the world have been investigated for the distribution of cyanobacteria and their toxins and the effects they have on the ecosystems. Similar research was performed on the Fehérvárcsurgó reservoir in Hungary during 2018. Cyanobacteria were present and blooming, and the highest abundance was recorded in July (2,822,000 cells/mL). The species present were Aphanizomenon flos-aquae, Microcystis flos-aquae, Microcystis wesenbergii, Cuspidothrix issatschenkoi, Dolichospermum flos-aquae, and Snowella litoralis. In July and September, the microcystin encoding gene mcyE and the saxitoxin encoding gene sxtG were amplified in the biomass samples. While a low concentration of microcystin-RR was found in one water sample from July, analyses of Abramis brama and Carassius gibelio caught from the reservoir did not show the presence of the investigated microcystins in the fish tissue. However, several histopathological changes, predominantly in gills and kidneys, were observed in the fish, and the damage was more severe during May and especially July, which coincides with the increase in cyanobacterial biomass during the summer months. Cyanobacteria may thus have adverse effects in this ecosystem.

The Source of Muddy Odor in Bream (Abramis brama) from the Porvoo Sea Area (Gulf of Finland)

1979 ◽  
Vol 36 (8) ◽  
pp. 883-890 ◽  
Author(s):  
Per-Edvin Persson
Keyword(s):  
Abramis Brama ◽  
Blue Green Alga ◽  
Bream Abramis Brama ◽  
High Nutrient ◽  
Off Flavors ◽  
Odor Compounds ◽  
High Concentrations ◽  
High Nutrient Concentration ◽  
Oscillatoria Agardhii ◽  
Sea Area

The study area was a shallow, extremely eutrophic, somewhat brackish water bay on the south coast of Finland. Muddy odor in bream (Abramis brama) was significantly correlated with the amount of the blue-green alga Oscillatoria agardhii occurring in the phytoplankton. Cultures dominated by this alga contained the muddy odor compound geosmin. The high concentrations of O. agardhii in the study area were caused by several interacting factors, of which the high nutrient concentration and the temperature of the water seemed to be especially important. Odoriferous actinomycetes isolated from the water produced the muddy odor compounds geosmin and 2-methylisoborneol, but there seemed to be a lag time of several weeks between maximal concentrations of actinomycetes and development of off-flavors in the fish. Key words: geosmin, 2-methylisoborneol, Oscillatoria agardhii, actinomycetes, flavor, fish, eutrophication

scholarly journals Hybridization behaviour between two common European cyprinid fish species – silver bream, Blicca bjoerkna and common bream, Abramis brama – in a controlled environment

2009 ◽  
Vol 59 (1) ◽  
pp. 97-108 ◽  
Author(s):  
Michaël Ovidio ◽  
Jean-Claude Philippart ◽  
Billy Nzau Matondo ◽  
Pascal Poncin
Keyword(s):  
Fish Species ◽  
Mating Success ◽  
Cyprinid Fish ◽  
Controlled Environment ◽  
Abramis Brama ◽  
Bream Abramis Brama ◽  
Common Bream ◽  
Common Bream Abramis Brama

AbstractThe egg release–mating comparison, heterospecific matings and mating success under two hybridization conditions – (i) mixing one sex per species and (ii) mixing both sexes from each species – were investigated to determine whether silver bream Blicca bjoerkna and common bream Abramis brama can hybridize in nature.The results revealed that non-matings in hybridization experiments of silver bream females × common bream males can be explained by territorial and aggressiveness activities observed in common bream. In common bream females × silver bream males, heterospecific matings were observed but their numbers were significantly lower than the spawning numbers, and in this experiment, a female mated with one to four heterospecific males. In mixing both sexes from both species, similar spawning – mating numbers were observed but heterospecific matings accounted for only 27% of the total matings, with 24% accounting for heterospecific matings between common bream females and silver bream males, directly or by opportunism. Mating success was characterized by the occurrence of fertilized eggs after matings.Natural hybridization occurred preferentially between common bream females and silver bream males.

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