Mullet fishes could be considered as one of important economic boney fish species that introduced... more Mullet fishes could be considered as one of important economic boney fish species that introduced to Caspian Sea from Black Sea by Russian experts between 1930-1934. Catching of Mullet fishes have been variated in recent years and iwas increased from 2500 MT in 1991 to 6700 MT in 2002 but some decreasment was observed such as 2700 MT in 2010 and 2151 MT in 2012. Mullet fish has two important species in the Caspian Sea such as Golden grey Mullet ( Liza auratus ) and Leaping mullet (Liza salience) and all of reproduction cycle were done in the Sea. Mullet fishes always feeding from the bottom sea as detritus habits and have important role in the filtration of nutrients in the bottom Sea. The feeding habits of this species include benthic organisms and detritus, making it particularly adapted to accumulate sediment-associated contaminants and thus an important bio-indicator species. So far, Mullet artificial production have been unsuccessful in the country. Unknown mortality have been ...
This study was designed to investigate the interaction effects of Viral Nervous Necrosis (VNN) di... more This study was designed to investigate the interaction effects of Viral Nervous Necrosis (VNN) disease on the blood parameters of Golden grey mullet (Liza auratus) in Southern coast of the Caspian Sea. About100 pieces of infected Golden grey mullet with emphasis on pathognomonic clinical signs of Viral Nervous Necrosis (VNN) disease were captured in sizes 20 up to 30 cm from the start of the fishing season of bony fish in the Caspian Sea in September 2012; the station branches were located in Noor, Mahmoud Abad, Babolsar, Fereydonkenar and Tonekabone. Samples were done with using of gill net coastal fisheries. All fish samples were transferred to haematology laboratory of Caspian Sea Ecology Research Centre, and then biometric information were recorded and blood samples were taken from fish caudal vein. Haematological parameters including Red and White blood cells count, Haematocrit, Haemoglobin , Mean Corpuscular Volume (MCV), Mean Corpuscular Haemoglobin (MCH) and the Mean Corpusc...
In this survey, the effects of Viral Nervous Necrosis (VNN) diseases on some of the blood Biochem... more In this survey, the effects of Viral Nervous Necrosis (VNN) diseases on some of the blood Biochemical parameters were studied in Golden grey mullet (Liza aurata) at Southern part of Caspian Sea. About 128 fish sample were captured from Babolsar, Fereydonkenar, Mahmoud Abad, Noor and Tonekabon stations. Moribund fish samples were selected that revealed some pathognomonic clinical signs such as abdominal distension, change in swimming behaviour, belly up and darkening in skin. Samples biometry calculations were done and fish ages were measured according to reading scales operation. Blood sample were collected from caudal vein and essential serum was isolated immediately from whole fish blood. Biochemical factors of serum, Total Protein, Albumin, Complement elements such as C3, C4 and IgM, were measured using standard methods and then compared with biochemical factors on health fish as control group. Excel 2010 software was used to calculating the serum parameters and drawing the relat...
Health status information of 23, 21 and 20 breeding and rearing rainbow trout farms were gathered... more Health status information of 23, 21 and 20 breeding and rearing rainbow trout farms were gathered as questionnaire 2006 to 2008, respectively. The selected farms were located in Haraz, Dohezar and Sehezar regions of Tonekabon, Sari and Chalous. The results showed that farm production have increased from 75.3 tons in 2006 to 106.4 tons in 2008. However, no changes were seen in acreage and consumed water volumes which in 90% were obtain from rivers. We have observed an increase in the incidence of disease as 56% in 2006, 71% in 2007 and 85% in 2008, respectively. The most important infectious diseases were reported Streptococcosis that incidence percent were 53%, 72% and 83%, respectively from 2006 to 2008. The results of treatment and disinfection activities have been shown an increase from 2006 to 2007 (respectively, 34.7%, 71.4% and 75%). Antibiotics were the most important drug in selected farms during survey times and their consumption was increased year to year (18.8% in 2006, 3...
Viral Nervous Necrosis (VNN) is a worldwide disease affecting several species of cultured marine ... more Viral Nervous Necrosis (VNN) is a worldwide disease affecting several species of cultured marine fish. For the past two decades, betanodavirus infections that cause Viral Nervous Necrosis (VNN) have emerged as major constraints on the culture and sea ranching of marine fish in almost all parts of the world. More than forty species mainly of marine origin have been so far affected and this number is likely to rise in future following the introduction of new species and the increase of aquaculture trade.
Following of some several reports about mortality and observation of clinical signs consist of da... more Following of some several reports about mortality and observation of clinical signs consist of darkening, abnormal swimming (spiral, corkscrew and belly up) and abdominal distention in Golden grey mullet (Liza auratus), about 86 fish samples (56 with mentioned clinical signs and 30 without clinical signs) were captured during March 2009 some fisheries cooperatives in Mazandaran province. In present study, after anesthesia with Dentol extract, fish biometry were done and then blood samples (0.5-1cc) were taken from caudal peduncle of the mentioned fish and then transferred into Ependrof tubes containing anticoagulant (one drop or 1cc heparin). Some of the most important hematological parameters were evaluated, including R.B.C., W.B.C., P.C.V. (Packed cell volume), Hb (Hemoglobin) and erythrocyte indices, M.C.V (Mean corpuscular volume), M.C.H (Mean corpuscular hemoglobin), M.C.H.C (Mean corpuscular hemoglobin concentration) and differential of blood cell count. Also some serum indice...
Catching of Mullet fishes have been varied in recent years and was increased from 2500 MT in 1991... more Catching of Mullet fishes have been varied in recent years and was increased from 2500 MT in 1991 to 6700 MT in 2002 but some reduction was observed such as 2700 MT in 2010 and 2151 MT in 2012. Mullet fishes always feeding from the bottom sea as detritus habits and have important role in the filtration of nutrients in the bottom Sea. The feeding habits of this species include benthic organisms and detritus, making it particularly adapted to accumulate sediment-associated contaminants and thus an important bio-indicator species. Unknown mortality has been occurred in wild mullet in the Caspian Sea since 2003. According to primary study and pilot plan that Viral Nervous Necrosis was confirmed by OIE Reference Laboratory in Italy and Japan and concerning to comprehensive research project it could be concluded that VNNV was the main causative agent of recent outbreaks in Mullet of Caspian Sea. In continuous investigation that was done on affected Mullet with pathognomonic clinical signs...
Mullet fishes could be considered as one of important economic boney fish species that introduced... more Mullet fishes could be considered as one of important economic boney fish species that introduced to Caspian Sea from Black Sea by Russian experts between 1930-1934. Catching of Mullet fishes have been variated in recent years and iwas increased from 2500 MT in 1991 to 6700 MT in 2002 but some decreasment was observed such as 2700 MT in 2010 and 2151 MT in 2012. Mullet fish has two important species in the Caspian Sea such as Golden grey Mullet ( Liza auratus ) and Leaping mullet (Liza salience) and all of reproduction cycle were done in the Sea. Mullet fishes always feeding from the bottom sea as detritus habits and have important role in the filtration of nutrients in the bottom Sea. The feeding habits of this species include benthic organisms and detritus, making it particularly adapted to accumulate sediment-associated contaminants and thus an important bio-indicator species. So far, Mullet artificial production have been unsuccessful in the country. Unknown mortality have been ...
This study was designed to investigate the interaction effects of Viral Nervous Necrosis (VNN) di... more This study was designed to investigate the interaction effects of Viral Nervous Necrosis (VNN) disease on the blood parameters of Golden grey mullet (Liza auratus) in Southern coast of the Caspian Sea. About100 pieces of infected Golden grey mullet with emphasis on pathognomonic clinical signs of Viral Nervous Necrosis (VNN) disease were captured in sizes 20 up to 30 cm from the start of the fishing season of bony fish in the Caspian Sea in September 2012; the station branches were located in Noor, Mahmoud Abad, Babolsar, Fereydonkenar and Tonekabone. Samples were done with using of gill net coastal fisheries. All fish samples were transferred to haematology laboratory of Caspian Sea Ecology Research Centre, and then biometric information were recorded and blood samples were taken from fish caudal vein. Haematological parameters including Red and White blood cells count, Haematocrit, Haemoglobin , Mean Corpuscular Volume (MCV), Mean Corpuscular Haemoglobin (MCH) and the Mean Corpusc...
In this survey, the effects of Viral Nervous Necrosis (VNN) diseases on some of the blood Biochem... more In this survey, the effects of Viral Nervous Necrosis (VNN) diseases on some of the blood Biochemical parameters were studied in Golden grey mullet (Liza aurata) at Southern part of Caspian Sea. About 128 fish sample were captured from Babolsar, Fereydonkenar, Mahmoud Abad, Noor and Tonekabon stations. Moribund fish samples were selected that revealed some pathognomonic clinical signs such as abdominal distension, change in swimming behaviour, belly up and darkening in skin. Samples biometry calculations were done and fish ages were measured according to reading scales operation. Blood sample were collected from caudal vein and essential serum was isolated immediately from whole fish blood. Biochemical factors of serum, Total Protein, Albumin, Complement elements such as C3, C4 and IgM, were measured using standard methods and then compared with biochemical factors on health fish as control group. Excel 2010 software was used to calculating the serum parameters and drawing the relat...
Health status information of 23, 21 and 20 breeding and rearing rainbow trout farms were gathered... more Health status information of 23, 21 and 20 breeding and rearing rainbow trout farms were gathered as questionnaire 2006 to 2008, respectively. The selected farms were located in Haraz, Dohezar and Sehezar regions of Tonekabon, Sari and Chalous. The results showed that farm production have increased from 75.3 tons in 2006 to 106.4 tons in 2008. However, no changes were seen in acreage and consumed water volumes which in 90% were obtain from rivers. We have observed an increase in the incidence of disease as 56% in 2006, 71% in 2007 and 85% in 2008, respectively. The most important infectious diseases were reported Streptococcosis that incidence percent were 53%, 72% and 83%, respectively from 2006 to 2008. The results of treatment and disinfection activities have been shown an increase from 2006 to 2007 (respectively, 34.7%, 71.4% and 75%). Antibiotics were the most important drug in selected farms during survey times and their consumption was increased year to year (18.8% in 2006, 3...
Viral Nervous Necrosis (VNN) is a worldwide disease affecting several species of cultured marine ... more Viral Nervous Necrosis (VNN) is a worldwide disease affecting several species of cultured marine fish. For the past two decades, betanodavirus infections that cause Viral Nervous Necrosis (VNN) have emerged as major constraints on the culture and sea ranching of marine fish in almost all parts of the world. More than forty species mainly of marine origin have been so far affected and this number is likely to rise in future following the introduction of new species and the increase of aquaculture trade.
Following of some several reports about mortality and observation of clinical signs consist of da... more Following of some several reports about mortality and observation of clinical signs consist of darkening, abnormal swimming (spiral, corkscrew and belly up) and abdominal distention in Golden grey mullet (Liza auratus), about 86 fish samples (56 with mentioned clinical signs and 30 without clinical signs) were captured during March 2009 some fisheries cooperatives in Mazandaran province. In present study, after anesthesia with Dentol extract, fish biometry were done and then blood samples (0.5-1cc) were taken from caudal peduncle of the mentioned fish and then transferred into Ependrof tubes containing anticoagulant (one drop or 1cc heparin). Some of the most important hematological parameters were evaluated, including R.B.C., W.B.C., P.C.V. (Packed cell volume), Hb (Hemoglobin) and erythrocyte indices, M.C.V (Mean corpuscular volume), M.C.H (Mean corpuscular hemoglobin), M.C.H.C (Mean corpuscular hemoglobin concentration) and differential of blood cell count. Also some serum indice...
Catching of Mullet fishes have been varied in recent years and was increased from 2500 MT in 1991... more Catching of Mullet fishes have been varied in recent years and was increased from 2500 MT in 1991 to 6700 MT in 2002 but some reduction was observed such as 2700 MT in 2010 and 2151 MT in 2012. Mullet fishes always feeding from the bottom sea as detritus habits and have important role in the filtration of nutrients in the bottom Sea. The feeding habits of this species include benthic organisms and detritus, making it particularly adapted to accumulate sediment-associated contaminants and thus an important bio-indicator species. Unknown mortality has been occurred in wild mullet in the Caspian Sea since 2003. According to primary study and pilot plan that Viral Nervous Necrosis was confirmed by OIE Reference Laboratory in Italy and Japan and concerning to comprehensive research project it could be concluded that VNNV was the main causative agent of recent outbreaks in Mullet of Caspian Sea. In continuous investigation that was done on affected Mullet with pathognomonic clinical signs...
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