جستجوی مقالات مرتبط با کلیدواژه "abramis brama" در نشریات گروه "دامپزشکی"

Diazinon is an organophosphate pesticide which is widely used in paddy fields located in northern parts of Iran, though it is prohibited to be used in many countries.
The purpose of the present study was to investigate sublethal effects of diazinon on blood parameters of common bream Abramis brama.
In sublethal toxicity test, fish were exposed to diazinon concentrations of 0.04, 0.36, 0.73 and 1.46 mg/l for 14 days and their hematological parameters including WBCs, white cell differential count, RBCs, Hct, Hb, MCV, MCH and MCHC were studied.
The results of sublethal toxicity indicated that by increase of toxicant concentration a significant decrease was appeared in WBCs, RBCs, Hct, Hb and MCH both after 7 and 14 days (p Regarding the toxicity of diazinon on various hematological parameters and the diazinon concentration in Iranian waters and considering the fish habitat in the waters which are connected to the Caspian Sea it suggests that the pesticide diazinon affect the fish survival.

The plerocercoid stage of Pseudophyllidean cestoda infected a wide range of fresh water fish، particularly the members of the Cyprinidae family. The parasite species are the most common pathogens that have severe effects on fish. The aim of the present study is to determine the occurrence and distribution of the plerocercoid of Diphyllobothriidae in two freshwater fish from north and northwest of Iran. Finally، we discuss the role and dynamics of these species of fish in the transmission of infection. This study was carried out from September 2011 to September 2012on a total of 883 A. bipunctatus and 418 A. brama from north and northwest of Iran. The samples were analyzed to find the plerocercoid infection. From a total number of 883 A. bipunctatus and 418 A. brama fish samples، 558 fish (63. 19%) of the former and 67 fish (16. 02%) of the latter were infected. The rate of infection was significantly lower in winter (p<0. 01). Also، the weight of infected fish was significantly lower than noninfected ones (p<0. 01). Moreover، the infection in northwest of Iran was significantly higher than north of Iran (p<0. 01). The family of Diphyllobothriidae is an important cestode and the prevention programs to break the cycle of infection are essential. More suitable solutions to tackle the problem، further epidemiological studies on other fresh water sources of Iran are needed.

Anzali lagoon is the most significant support for the Caspian Sea fishes that come for laying eggs and breeding. Monitoring certain parameters indices such as metabolic، pathologic or parasitic indicators could be used as a useful، economical and reliable indicator to determine the effects of pollutants on the ecosystem. Therefore، mostly ectoparasitesare necessary characteristics for a parasite species to be used as a pollution indicator. Hemiculter leucisculus is a native fish and Abramis brama orientalis is a migrant of the Anzali lagoon. In order to identify the contamination rates and investigate the average of pollution 150 Abramis bramaorientalisi and 200 Hemiculter leucisculus from five stations transported to the central lab. From all areas including; fin، skin surface and gill samples was taken for investigation. Found parasitic protozoan are: Trichodina that in Abramis bramaorientalis fish its rate was 33. 27%، and in Hemi was 21 %، this parasite was on the skin and gill of the fish، in fact the highest rate of infection was associated to this parasite. Ichthyophthrius; its infection rate among Abramis bramaorientalis fishes was 19. 33% and 19. 5% among Hemiculter leucisculus fishes. This parasite is positioned on the skins surface and gill، after the survey there was no sign of infection in blood sample. Chilodonella was 18% among Abramis bramaorientalis، fish and 14. 5% among Hemiculter leucisculus fish. Ichtyobodo was 15. 33% among Abramis bramaorientalis and 17% among Hemiculter leucisculus fish. Ectoparasites are more obedient to water environment conditions compared by internal ones. In five sampling places، the northern region of the central district in Anzali lagoon، the highest contamination load is concerned with Pirbazar River that the infection caused by protozoan ectoparasite is more intense.

Anzali lagoon can be one of the most important wetlands called the world. This lagoon to support the most fish in the Caspian Sea is reproduced for the spawn، multiply، and sometimes live، to make the pond. Much of Rasht and Anzali city sewage and agricultural waste area of the lagoon through rivers into the Pyrbazar and increased levels of organic pollutants such as nitrite، nitrate، phosphate، oil and heavy metals to derivatives. Seasonal parasite prevalence and density by organic pollutants is influenced to justify. Indicators of metabolic، parasitic، or pathologic marker as a useful، economical and reliable to determine the effects of environmental contaminants are used. Therefore، mainly ectoparasites as pollution indicators are used. Thus، the relative frequency of contamination of monogeneanectoparasites in fish Tyzcoli (Hemiculter leucisculus) of native fish and Sim (Abramis bramaorientalis) Anzali lagoon of migrant fish were investigated. Five sampling stations in the Anzali lagoon were done. Station using the relevant tour blades per station number 30 sim and 40 number fish Tyzcoli fishing was live in the central laboratory was transferred. The Dactylogyrushigh number of fish that were studied about 19. 4% of fish studied are infected with this parasite. Gyrodactylus9. 4% of fish parasites and 3. 1% were infected with parasites Diplozoon paradoxum. in five places، sampling، parts of Anzali lagoon north central area on river water pollution caused by pyrbazar the location of contamination is high value monogenean parasites were more severe. Of contamination between fish Sim and Tyzcoli no significant mean difference (p <0005).