A rickettsia of the blue king crab, Paralithodes platypus

Johnson, Phyllis T.

doi:10.1016/0022-2011(84)90053-3

Cited by 30 publications

(24 citation statements)

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“…The dark discolouration of SPD was caused by a melanotic encapsulation of the etiological agent. Haemocyte infiltration, aggregation and encapsulation in responses to RLM have also been reported by Johnson (1984) and Anderson et al (1987) in the blue king crab Paralithodes platypus, and tiger prawn Penaeus monodon, respectively. However, only Anderson et al (1987) noted that melanin was involved with the haemocytic response, but visible signs of melanism were not mentioned.…”

Section: Field Surveyssupporting

confidence: 64%

Stained prawn disease (SPD) of Pandalus platyceros in British Columbia, Canada, caused by a rickettsial infection

Sm¹,

Meyer²,

Ja³

1996

Dis. Aquat. Org.

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Stained prawn disease (SPD) with clinical signs of black discolouration of the cuticula, especially around the edges of body segments, and black stippling on the surface of the hepatopancreas was caused by a rickettsia-like microorganism with a n affinity for fixed phagocytes and haemocytes. This disease was found in prawns from various localities throughout Howe Sound and at one location in the S t r a~t of Georgia, British Columb~a, Canada. The distribution of SPD wlthin Howe Sound has not changed since it was first detected In 1989. However, the prevalence has declined to about 4 % from a record high of about 15% In July 1990 and March 1991 In areas with these high prevalences, an above-average level of mortality, equated to a decline in survival rates from 57 to 15'X,, was detected. These mortalities were not attributable to fishing pressure because the affected area has been closed to fish~ng since November 1988 due to unacceptable levels of dioxin and furan compounds In shellfish tissue samples. Laboratory studies indicated that the SPD agent can be transm~tted horizontally by cannibalism and via the water [exposure to screened (1 mm pore size) effluent from lnfected prawns] and remained infectious for 10 d or more of storage at -lO°C. About 50% of the prawns that fed on infected prawns (both fresh and after being frozen) and 25 % of the prawns exposed to contaminated water became infected. Most mortalities attributable to SPD occurred between 2 and 4 mo after exposure to the etiological agent in the laboratory.

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Section: Field Surveyssupporting

confidence: 64%

Stained prawn disease (SPD) of Pandalus platyceros in British Columbia, Canada, caused by a rickettsial infection

Sm¹,

Meyer²,

Ja³

1996

Dis. Aquat. Org.

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“…They have been found world wide in molluscs (BUCHANAN,1978;MORRISON and SHUM,1982;ELSTON and PEACOCK,1984) and have been reported to infect crustaceans (JOHNSON, 1984;SPARKS et al,1985;BROCK et al,1986), and amphibians (DESSER and BARTA,1984) where small coccoid forms, staining pink with GIEMSA, were found within monocytes and in plasma of blood smears from a dead tetradonid fish.…”

Section: Discussionmentioning

confidence: 99%

Isolation of a rickettsiales-like organism from diseased coho salmon (Oncorhynchus kisutch) in Chile.

et al. 1990

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“…To survive and reproduce, the rickettsia organism must enter the eucaryotic host cell, multiply within the cell, exit and reestablish this cycle in another cell (Winkler 1990). Rickettsia-like microorganisms infect a wide range of aquatic crustaceans including amphipods, crabs, freshwater crayfish and prawns (Federici et al 1974, Harshbarger et al 1977, Bonami & Pappalardo 1980, Larrson 1982, Johnson 1984, Brock et al 1986, Anderson et al 1987, Krol et al 1991, Frelier et al 1992, Fryer & Lan-nan 1994, Bower et al 1996, Jimenez & Romero 1997, Edgerton & Prior 1999, Wang & Gu 2002.…”

Section: Introductionmentioning

confidence: 99%

Molecular detection methods developed for a systemic rickettsia-like bacterium (RLB) in Penaeus monodon (Decapoda: Crustacea)

Nunan¹,

Poulos²,

Redman³

et al. 2003

Dis. Aquat. Org.

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Molecular detection methods were developed to aid in the diagnosis of a rickettsia-like bacterium (RLB) which caused severe mortalities of farm-raised Penaeus monodon in Madagascar. Using primers derived from the 16S rRNA gene of bacteria, a PCR assay was optimized to amplify this region of the genome of the RLB, using extracted DNA from infected P. monodon tissue as the template. The resulting amplified PCR product was sequenced and 2 novel primers were selected from the variable region of the gene. These primers amplified a 532 bp fragment of DNA originating from the rickettsia-infected samples. The PCR assay was optimized and tested on DNA extracted from specific pathogen-free (SPF) P. vannamei tissue and several other strains of bacteria. The PCR assay with the rickettsia-specific primers was specific for this RLB and did not amplify the other DNA samples tested. The 532 bp PCR-amplified fragment was labeled with digoxigenin (DIG) for in situ hybridization assays. This probe was tested on SPF, RLB and bacteria-infected shrimp specimens preserved in Davidson's fixative. The probe was specific for both natural and experimental rickettsial infections. Hybridization with this probe required a stringent temperature of 65°C, otherwise cross-reactivity was observed with other types of bacteria. KEY WORDS: Rickettsia · Penaeus monodon · Shrimp · CrustaceaResale or republication not permitted without written consent of the publisher

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A rickettsia of the blue king crab, Paralithodes platypus

Cited by 30 publications

References 0 publications

Stained prawn disease (SPD) of Pandalus platyceros in British Columbia, Canada, caused by a rickettsial infection

Stained prawn disease (SPD) of Pandalus platyceros in British Columbia, Canada, caused by a rickettsial infection

Isolation of a rickettsiales-like organism from diseased coho salmon (Oncorhynchus kisutch) in Chile.

Molecular detection methods developed for a systemic rickettsia-like bacterium (RLB) in Penaeus monodon (Decapoda: Crustacea)

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