Bonamia ostreae in the New Zealand oyster Ostrea chilensis: a new host and geographic record for this haplosporidian parasite

Lane, Henry S.; Webb, Stephen C.; Duncan, John

doi:10.3354/dao02960

Cited by 48 publications

(34 citation statements)

References 40 publications

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“…Investment in a breeding programme to select O. angasi for resistance to B. exitiosa in Australia is justified if substantial industry expansion is anticipated or desired. Bonamia ostreae was detected in the Southern Hemisphere for the first time in New Zealand in 2015 (Lane, Webb, & Duncan, ), and B. ostreae poses a substantial threat to susceptible oysters in Australia (Animal Health Committee, ). The impact of B. ostreae in Australia is assessed as severe, but the susceptibility of O. angasi to B. ostreae and whether selectively reared B. exitiosa ‐resistant oysters would also be resistant to B. ostreae are unknown.…”

Section: Discussionmentioning

confidence: 99%

Rapid transmission of Bonamia exitiosa by cohabitation causes mortality in Ostrea angasi

Buss

Harris

Tanner

et al. 2019

Journal of Fish Diseases

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The haplosporidian Bonamia was first detected in Australian shellfish in 1991. Australian isolates in Ostrea angasi Sowerby, 1871 were identified as Bonamia exitiosa Hine, Cochennac and Berthe, 2001, which threatens development of an O. angasi aquaculture industry. European field data suggest that Bonamia ostreae Pichot, Comps, Tigé, Grizel and Rabouin, 1980 infections in Ostrea edulis Linnaeus, 1758 build slowly, but infection dynamics of B. exitiosa in O. angasi are unknown. We investigated B. exitiosa infection in O. angasi by cohabiting uninfected juvenile O. angasi with adults infected with B. exitiosa. Oysters were sampled at 10, 21 and 40 days after cohabitation, and B. exitiosa prevalence and intensity were assessed. Bonamia exitiosa rapidly infected and caused disease in O. angasi. Mortalities began at 12 days, with ˜50% mortality by day 21 and >85% mortality by day 40. Mortalities displayed pathology consistent with clinical B. exitiosa infection. Time to first infection is likely influenced by a combination of parasite infectivity, host exposure and host immune capacity. Host death is not required for transmission, but probably facilitates release of parasites from decaying tissue. Understanding B. exitiosa transmission informs design and interpretation of field studies and aids development of management strategies for oyster aquaculture.

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Section: Discussionmentioning

confidence: 99%

Rapid transmission of Bonamia exitiosa by cohabitation causes mortality in Ostrea angasi

Buss

Harris

Tanner

et al. 2019

Journal of Fish Diseases

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“…Together these parasites caused a sharp decline in flat oyster production in France first, followed by in other countries in Europe (see special edition of the Diseases of Aquatic Organisms journal, vol.110, 2014). Recently, B. ostrea was reported for the first time in New Zealand (Lane et al, 2016). Another member of this genus, Bonamia exitiosa, also caused mortalities in Ostrea chilensis in New Zealand (Hine et al, 2001) and in O. puelchana from wild and cultured populations in Argentina (Oehrens Kissner et al, 2014).…”

Section: Bivalve Diseasesmentioning

confidence: 99%

Effects of marine harmful algal blooms on bivalve cellular immunity and infectious diseases: A review

Lassudrie

Hégaret

Wikfors

et al. 2020

Developmental & Comparative Immunology

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Bivalves were long thought to be "symptomless carriers" of marine microalgal toxins to human seafood consumers. In the past three decades, science has come to recognize that harmful algae and their toxins can be harmful to grazers, including bivalves. Indeed, studies have shown conclusively that some microalgal toxins function as active grazing deterrents. When responding to marine Harmful Algal Bloom (HAB) events, bivalves can reject toxic cells to minimize toxin and bioactive extracellular compound (BEC) exposure, or ingest and digest cells, incorporating nutritional components and toxins. Several studies have reported modulation of bivalve hemocyte variables in response to HAB exposure. Hemocytes are specialized cells involved in many functions in bivalves, particularly in immunological defense mechanisms. Hemocytes protect tissues by engulfing or encapsulating living pathogens and repair tissue damage caused by injury, poisoning, and infections through inflammatory processes. The effects of HAB exposure observed on bivalve cellular immune variables have raised the question of possible effects on susceptibility to infectious disease. As science has described a previously unrecognized diversity in microalgal bioactive substances, and also found a growing list of infectious diseases in bivalves, episodic reports of interactions between harmful algae and disease in bivalves have been published. Only recently, studies directed to understand the physiological and metabolic bases of these interactions have been undertaken. This review compiles evidence from studies of harmful algal Highlights  Review of the main studies on effects of marine harmful algae on bivalve immune cells (hemocytes) and on infectious disease  Harmful algae can modulate host-pathogen interactions in bivalves on various way (increase or decrease the infection)  Some experimental studies report the involvement of cellular immunity and global physiological weakness in the modulations  Other mechanisms possibly involved: HAB effects on bivalve filtration; direct

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“…B. ostreae has spread in Europe (France, Ireland, Netherlands, Portugal, Spain and the U.K.), but also on the west coast of Canada and both coasts of the USA [44]. B. ostreae was found in O. edulis imported to China [45]; recently, this species was detected in New Zealand infecting the flat oyster Ostrea chilensis [46]. B. exitiosa was found in O. chilensis in South Island, New Zealand [47] , and in Ostrea angasi in southeastern Australia [48].…”

Section: Infectious Diseases Of Marine Bivalve Mollusksmentioning

confidence: 99%

Microbial Diseases of Bivalve Mollusks: Infections, Immunology and Antimicrobial Defense

et al. 2017

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A variety of bivalve mollusks (phylum Mollusca, class Bivalvia) constitute a prominent commodity in fisheries and aquacultures, but are also crucial in order to preserve our ecosystem’s complexity and function. Bivalve mollusks, such as clams, mussels, oysters and scallops, are relevant bred species, and their global farming maintains a high incremental annual growth rate, representing a considerable proportion of the overall fishery activities. Bivalve mollusks are filter feeders; therefore by filtering a great quantity of water, they may bioaccumulate in their tissues a high number of microorganisms that can be considered infectious for humans and higher vertebrates. Moreover, since some pathogens are also able to infect bivalve mollusks, they are a threat for the entire mollusk farming industry. In consideration of the leading role in aquaculture and the growing financial importance of bivalve farming, much interest has been recently devoted to investigate the pathogenesis of infectious diseases of these mollusks in order to be prepared for public health emergencies and to avoid dreadful income losses. Several bacterial and viral pathogens will be described herein. Despite the minor complexity of the organization of the immune system of bivalves, compared to mammalian immune systems, a precise description of the different mechanisms that induce its activation and functioning is still missing. In the present review, a substantial consideration will be devoted in outlining the immune responses of bivalves and their repertoire of immune cells. Finally, we will focus on the description of antimicrobial peptides that have been identified and characterized in bivalve mollusks. Their structural and antimicrobial features are also of great interest for the biotechnology sector as antimicrobial templates to combat the increasing antibiotic-resistance of different pathogenic bacteria that plague the human population all over the world.

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Bonamia ostreae in the New Zealand oyster Ostrea chilensis: a new host and geographic record for this haplosporidian parasite

Cited by 48 publications

References 40 publications

Rapid transmission of Bonamia exitiosa by cohabitation causes mortality in Ostrea angasi

Rapid transmission of Bonamia exitiosa by cohabitation causes mortality in Ostrea angasi

Effects of marine harmful algal blooms on bivalve cellular immunity and infectious diseases: A review

Microbial Diseases of Bivalve Mollusks: Infections, Immunology and Antimicrobial Defense

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