First Report of <i>Achlya oblongata</i> Infection in Freshwater‐Reared Asian Seabass <i>Lates calcarifer</i>

Lau, Lik-Ming; Hatai, Kishio; Fukano, Hanako; Kurata, Osamu

doi:10.1002/aah.10018

Cited by 5 publications

(7 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…FIRST REPORT OF ACHLYA BISEXUALIS IN SOUTH AFRICA 359 cotton, wool-like appearance of mycelia covering dermal erosions or skin lesions (Chukanhom and Hatai 2004;Andrew et al 2008;Refai et al 2016;Lau et al 2018). The infectious agent from this study showed similar clinical signs, with superficial, cotton, wool-like mycelia covering the eye of an Orange Blotched Peacock Cichlid.…”

Section: Discussionsupporting

confidence: 57%

“…Achlya spp. have been confirmed as pathogenic agents causing mycoses in aquaculture, specifically in tropical environments where infection has been reported to affect economically important cultured fish species (Lawhavinit et al 2002;Webster and Weber 2007;Lau et al 2018). Infections with Achlya spp.…”

Section: Discussionmentioning

confidence: 99%

“…Achlya species have been reported as either obligate or facultative pathogens infecting both wild and cultured fish and their eggs (Lawhavinit et al 2002;Chukanhom and Hatai 2004;Czeczuga et al 2005;Prasad and Rajanaika 2010;Hunjavanit et al 2012;Mastan et al 2012;Dubey et al 2018). Infections with Achlya species are known as occasional etiological agents in aquaculture, particularly in tropical countries (Lilley and Roberts 1997;Lau et al 2018). Due to the common occurrence of Achlya species in natural water systems and their wide range of susceptible hosts under conditions that favor facultative infections (Dubey et al 2018;Lone et al 2018), it is not surprising that Achlya infections have been widely reported as secondary infections on physical injuries or in combination with other, primary pathogenic agents (Lawhavinit et al 2002).…”

mentioning

confidence: 99%

“…Another species, A. inflata, has been isolated from Brown Trout Salmo trutta in Poland (Czeczuga et al 2005). More recently, A. oblongata has been reported as a pathogen of farmed Asian Seabass fry Lates calcarifer in Malaysia (Lau et al 2018).…”

mentioning

confidence: 99%

“…The genus Achlya typically shares phenotypical characteristics with other members of the order Saprolegniales, including similar environmental requirements for growth and reproduction, morphology, and cotton wool-like mycelia often covering dermal erosions or skin lesions (Chukanhom and Hatai 2004;Refai et al 2016;Dubey et al 2018;Lau et al 2018). This physical similarity with other genera in Saprolegniales often results in the incorrect or inaccurate diagnosis as a Saprolegnia species or Saprolegnia-like infection.…”

mentioning

confidence: 99%

See 4 more Smart Citations

First Record of the Water Mold Achlya bisexualis (Saprolegniaceae) Isolated from Ornamental Fish in South Africa

2019

View full text Add to dashboard Cite

The order Saprolegniales (Class Oomycota) is a group of fungus-like eukaryotic microorganisms that have been associated with infections in fish and fish eggs. Infections with microorganisms from this order are clearly evident because they have a cotton wool-like appearance. The aim of this study was to characterize and identify an oomycete that was isolated from the eye of an Orange Blotched Peacock Cichlid Aulonacara sp. A sample of cotton wool-like mycelia was isolated and single-spore isolations were conducted. Molecular characterization and phylogenetic analysis of the ITS1-5.8-ITS2 rDNA region for all isolates were used for species identification. Following molecular identification, one isolate was used to culture and characterize the reproductive structures. Physiological characterization entailed incubating the isolate on potato dextrose agar (PDA) at five different temperatures, ranging from 5°C to 25°C, to monitor growth rates. A multiple sequence alignment showed 100% similarity between all of the single-spore isolates and alignment with other Achlya bisexualis strains. Long, coarse hyphae with zoosporangia and gemmae typical of the order Saprolegniales were observed with an optimal growth rate at 25°C. The oomycete that was isolated from an Orange Blotched Peacock Cichlid was identified as A. bisexualis, the first record of this species in South Africa.

show abstract

Section: Discussionsupporting

confidence: 57%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

First Record of the Water Mold Achlya bisexualis (Saprolegniaceae) Isolated from Ornamental Fish in South Africa

2019

View full text Add to dashboard Cite

show abstract

Achlya sp. Dermatitis in an American Alligator (Alligator mississippiensis)

Lau

Snook

Swinford

et al. 2020

Journal of Comparative Pathology

View full text Add to dashboard Cite

Molecular identification and phylogenetic analysis of fungal pathogens isolated from diseased fish in Xinjiang, China

Zhang

Han

et al. 2021

Journal of Fish Biology

View full text Add to dashboard Cite

The outbreaks of fungal diseases in cultured fish have been severe in recent years, which is harmful to the healthy and sustainable development of fish farming. In this study, an investigation was conducted for significant fungal infections of 12 species of fish in four regions in Xinjiang, China, to understand the distribution of local fish fungal pathogens. Twenty‐six fungal strains with pathogenicity were isolated, and the challenge experiment showed that eight strains from Changji area had high infection rate to fish eggs. Based on internal transcribed spacer sequence data and molecular analysis, the 26 strains were classified into nine different species of six fungal genera. Phylogenetic analysis showed that all strains were divided into two clades, namely Cluster 1 (contains only the genus Mucor) and Cluster 2 (consists of five small branches), and the distribution of strains from the same region was scattered in two clusters. There is no strict host selectivity for these fungi to infect fish. Mucor sp. are the main fungal pathogen of fish in these four regions, whereas Hypophthalmichthys molitrix and Carassius auratus are two types of fish that were susceptible to pathogen. In addition, the environmental adaptability experiments showed that eight highly pathogenic strains have different adaptability to the environment, and their optimum temperature and pH were 25°C and 7.0, respectively, whereas the concentration of NaCl was negatively correlated with the growth of strains. Therefore, these results indicated that the coinfection of multiple fungal pathogens in a culture region should be considered in the future study.

show abstract

First Report of Achlya oblongata Infection in Freshwater‐Reared Asian Seabass Lates calcarifer

Cited by 5 publications

References 16 publications

First Record of the Water Mold Achlya bisexualis (Saprolegniaceae) Isolated from Ornamental Fish in South Africa

First Record of the Water Mold Achlya bisexualis (Saprolegniaceae) Isolated from Ornamental Fish in South Africa

Achlya sp. Dermatitis in an American Alligator (Alligator mississippiensis)

Molecular identification and phylogenetic analysis of fungal pathogens isolated from diseased fish in Xinjiang, China

Contact Info

Product

Resources

About