摘要:

Abstract.The lower Murray population of bony bream is subject to an annual epidemic of the oomyceteSaprolegnia(principallyS. parasitica) and the bacteriumAeromonas hydrophila.The epidemic is species‐specific; it mainly affects adults whose susceptibility may be increased by stress due to winter cold. Lesions occur on the mid‐flank and are characterized by an external mycelium, epidermal erosion, scale loss, hypodermal and muscular oedema, haemorrhage, myofibril degeneration and by the presence ofSaprolegniahyphae at all stages of infection. AlthoughA. hydrophilais common in advanced lesions there is no significant systemic bacterial infection. This appears to be a primary mycotic dermatitis and is noteworthy becauseSaprolegniais best‐known as a secondary pat

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1989.tb00305.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract.The proteases secreted by four strains (MT004, 1102, 480 and 480P‐) ofAeromonas salmonicidagrown in liquid culture have been studied. Strains MT004, 1102 and 480 all show a similar pattern with two types of proteases produced; one of molecular weight 70 000 which is active against casein and gelatin and one (or more) of lower molecular weight (about 20 000) which is (are) active against gelatin but not casein. Strain 480P‐produces only the latter type of protease(s). The protease of molecular weight 70 000 is classified as a serine‐type protease, but further characterization of the features of its active site has not yet proved possible. The results are discussed in terms of the previously published but often contradictory data on the proteases ofA. salmon

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1989.tb00306.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract.Aeromonas salmonicida, the aetiologic agent of furunculosis, causes high mortality in cultured salmonids. Experiments were conducted to determine the therapeutic and prophylactic efficacy of passive immunization against furunculosis in brook trout,Salvelinus fontinalis(Mitchill), infected by immersion. Rabbit hyperimmune serum was produced against a virulent strain ofA. salmonicidaand an aliquot of this serum was absorbed with cells of a non‐virulent strain ofA. salmonicida.Immunoglobulins from aliquots of the absorbed and non‐absorbed serum were purified using affinity chromatography. Each serum or immunoglobulin preparation was tested in passive immunization experiments. Brook trout were infected by immersion in a suspension of virulentA. salmonicida, and passively immunized by intraperitoneal injection at the time of experimental infection, or at various periods after experimental infection. Passive immunization of brook trout against furunculosis was therapeutically efficacious when effected either at zero, 24 or 48h post‐infection, but not at 72 or 96h. Purified rabbit immunoglobulins specific to virulentA. salmonicidawere as protective as the initial rabbit hyperimmune serum in protecting brook trout against furunculosis. To determine the prophylactic efficacy of this treatment, the groups of fish passively immunized at the time of the experimental infection were challenged a second time at either 14, 35, 41 or 56 days after passive immunization. Brook trout were protected against a second experimental bath challenge with virulentA. salmonicidafor a period of 35–

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1989.tb00307.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract.Changes in the properties of urine and blood of carp with sekoke disease were studied. With the progress of this disease, the parameters of blood and particularly urine changed significantly. After 120 days, urine flow, osmolarity and concentrations of inorganic ions (K+, Ca2+, Mg2+, Cl−) and organic compounds (ammonium, creatine and creatinine, protein, glucose) in the experimental group showed higher values than those of the controls. Even after 60 days, when clinical signs of sekoke disease were not evident, abnormally high concentrations of ammonium, protein and glucose in the urine were found in the experimental grou

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1989.tb00308.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract.Recent shipments of goldfish into Canada have suffered major mortality within a short time of arrival. The pathology and bacteriology of several of these diseased fish are described. Lesions were either acute and necrotizing with haemorrhage, or they were granulomatous. In either case, the spleen was a prime target, although in severely affected animals other organs were similarly involved; these included anterior and posterior kidney (plus endocrine elements), liver, intestine, mesentery and brain. Associated with these lesions were intracellular bacteria, which were often arranged in a Chinese letters‐like configuration, and which are presumed to be the cause of the disease. The Gram‐negative bacterium was isolated from all fish, but its characteristics were such that it was not easily classified and its taxonomy therefore remains uncert

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1989.tb00309.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract.Monoclonal antibodies specific toBonamia ostreae(Ascetospora), the intrahaemocytic parasite of the flat oyster,Ostrea edulisL., were used in an indirect fluorescent antibody assay, firstly to define the subcellular location of their epitopes and, secondly, as a means of diagnosis of the disease.

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1989.tb00310.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract.The pilchard,Sardina pilchardus(Walbaum), is parasitized in coastal waters in the Languedoc‐Roussillon region (South of France) by a copepod species which belongs to the genusLernaeenicus(Siphonostomatoida, Pennellidae). These mesoparasites become established in various parts of the body of the host (eye, lateral muscle or muscle at the bases of fins). Examination of specimens which had penetrated at the root of pectoral fins revealed that some had penetrated the heart. A curious case of transcardiac parasitism was observed. Host tissue reactions caused by the presence of parasites are describe

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1989.tb00311.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract.The tolerance of sac fry of lake trout,Salvelinus namaycush(Walbaum), to the acute effects of gas supersaturation, from hatching to swim‐up, was tested using six gas levels, ranging from ΔP 8 to 148. Although many fish were moribund by the time the yolk was nearly absorbed, mortality during the 40‐day study was negligible; survival to swim‐up was 96–99%, including 99% survival at ΔP 148. Of fish examined at ΔP 42, 40% showed bubble formation around the rim of the eye. Signs of trauma were greatest at ΔP 119 and 148, and included intestinal bubbles, a distended abdomen, and bubbles around the eye, in the mouth and in

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1989.tb00312.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1989.tb00313.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Book reviewed in this article:Disease Diagnosis and Control in North American Marine Aquaculture. C. J. Sindermannand D. V. Lightner

ISSN:0140-7775    

DOI:10.1111/j.1365-2761.1989.tb00314.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY