ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1984.tb01168.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Abstract.The activity of the pituitary‐gonad axis was examined in goldfish,Carassius auratus(L.), collected from two populations exhibiting epizootics of an ulcerative disease. One population, collected from a pond in Toronto, Ontario, exhibited a significant linear relationship between the extent of lesions and the ovarian state. In a second population, collected from Hamilton Harbour, Lake Ontario, there was no correlation between the high prevalence of oocyte atresia, or the ovarian state with the extent of the ulcerative lesions. Additionally, in the Hamilton Harbour population there were no seasonal changes in the stages of egg development, frequency of mature ova, activity of the pituitary‐gonad axis or gonadosomatic index consistent with gamete release. This apparent spawning failure of the Hamilton Harbour population was supported by the age distribution in the population (no fish younger than 4 years of age were found), and probably accounts for the drastic decline in the capture success of goldfish at that site since 1978. This decline in capture success was correlated with the outbreak of a persistent epizootic of ulcerative disease, suggesting that either the lesions themselves caused the spawning failure, or that the spawning failure and lesion outbreak were both correlated with undetermined changes in the environment, possibly a deterioration in the water quality in Hamilton Harb

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1984.tb01169.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Abstract.Mebendazole (methyl‐5‐benzoyl benziraidazole‐2‐carhamate) was shown to have anthelmintic activity against larvae ofProteocephalus ambloplitis(Leidy) in implantations were found to be highly effective. A single intraperitoneal injection of 200 mg/kg or a capsule implantation of 200 mg/kg of mebendazole each reduced the infection by 95 % after 6 weeks. Oral treatment for 14 consecutive days at 100 mg/kg/ day reduced I he infection by 90%. Intraperitoneal injection of 200 mg/kg of mebendazole ever, did not interfere with spawning and reproduction of largemouth bass; however fish injected with 300 mg/kg produced no fry. Haematocrit, total haemoglobin, total serum protein and histological changes were not evidenl in treat

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1984.tb01170.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Abstract.Rainbow trout fed prepared rations containing therapeutic levels of erythromycin (110 mg/kg daily) developed lesions in epithelial cells of the first proximal segment of the nephron. Pathological changes which developed within 24 h were characteristic of congestive overloading of lysosomes. Treated fish became anorexic within 2–3 weeks. Affected epithelial cells offish after 14 days of anorexia contained residual bodies in an otherwise normal appearing cytoplasm. Cell injury was reversible. Since the onset of anorexia corresponded with the completion of the recommended treatment period and damaged cells repair rapidly, erythromycin should nevertheless be retained as the treatment of choice for bacterial kidney diseas

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1984.tb01171.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Abstract.A spontaneous unilateral exophthalmos occurring in five species of otherwise healthy rockfish,Sebastesspp., was investigated. All eyes from nine unilaterally exophthalmic and seven non‐exophthalmic rockfish were examined grossly and histologically. In all affected fish the exophthalmos was due to enlargement of the globes resulting from the formation of choroidal cysts filled with a clear, watery fluid and surrounded by dense, aberrant connective tissue. Cyst formation led to gross distortion and disorganization of the choroid. Distorted remnants of the choroidal rete mirabile contained markedly fewer erythrocytes, a homogeneous proteinaceous material and a mild inflammatory cell infiltrate. Thickened scleral cartilage with disoriented chondrocytes was also present in exophthalmic eyes. Some of the affected eyes showed pigmentary abnormalities with clumps of heavily pigmented cells present in the retina and choroid. Retinal degeneration and detachment was also evident in some of the affected eye

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1984.tb01172.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Abstract.The histopathology of an atypicalAeromonas salmonicidafound in Atlantic cod,Gadus morhuaL., is described. Unlike members of the Salmonidae, the cod showed a well‐developed host reaction toA. salmonicidainvolving encystment of the bacteria. When Atlantic salmon,Salmo salarL., were given an intramuscular injection with suspensions of cultures of this strain ofA. salmonicidano cellular host reaction was observed. When cod were given a similar injection the bacteria showed degenerative changes, leucocytes accumulated, and cyst formation was seen in the spleen and kidney. Since cod can be infected by this organism the possibility exists that they could act as carriers, a source of infection for salmonids in saltwater cage culture or in the wil

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1984.tb01173.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1984.tb01174.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1984.tb01175.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1984.tb01176.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1984.tb01177.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY