Fish diseases and strategies taken by the farmers in freshwater aquaculture at southwestern Bangladesh

Aftabuddin, Sheikh; Islam, Md. Latiful; Bhuyain, Mohammad Abdul Baten; Mannan, MA; Alam, M. M. Mahbub

doi:10.3329/bjz.v44i1.30181

Cited by 16 publications

(16 citation statements)

References 2 publications

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“…Fish disease and its management is a big challenge in commercial fish farming in Bangladesh. Along with the reported diseases edwarsielosis, red sopt, gill rot, parasitic disease are the most common freshwater fish diseases in Bangladesh (Aftabuddin et al, 2016).…”

Section: Diseasesmentioning

confidence: 99%

Present status, problems and prospect of fish farming at Gazipur Sadar upazila in Bangladesh

et al. 2018

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The present study was conducted to reveal the present scenario, problems and the prospect of fish farming of Gazipur Sadar upazila Bangladesh. The primary data were collected through field survey, questionnaire interview and focus group discussion from the fish farmers of several villages and urban areas of the upazila. Secondary data were collected from the Department of Fisheries and aquaculture extension section. Gazipur Sadar upazila has 14462.42 ha potential fisheries resources of which floodplains, seasonal water bodies, and ponds comprise 71.01%, 13.04%, and 8.57%, respectively. The total fish production of the upazila in 2016-17 was 14492.7 MT, 27% of the Gazipur district. The highest fish production of 5436 MT and 4.39 MT/ha/year came from the pond sector. Among different pond culture systems, the semi-intensive system had the highest fish production output (2826 MT). Exotic carps were the highest produced fish in the ponds. However, in spite of comprising a huge proportion of seasonal floodplains the fish production from this sector was only 0.42 MT/ha/year in 2016-2017. This indicates the poor utilization of inland open water resources for fish production in the study area. The major areas were identified to improve the existing pond fish farming situation were access to low-interest loan, quality seed, supply of advanced technologies, need-based training, and marketing facilities. Along with improving the pond fish farming, community-based fisheries management and some aquaculture initiatives on private own seasonal floodplains should be taken on a priority basis to improve open water management and to flourish inland fish production in the study area.Progressive Agriculture 29 (1): 53-63, 2018

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Section: Diseasesmentioning

confidence: 99%

Present status, problems and prospect of fish farming at Gazipur Sadar upazila in Bangladesh

et al. 2018

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“…Antibiotic susceptibility pattern results showed that the highest resistance was observed against tetracycline (100%), followed by ampicillin (80%). The observed resistance may be due to the use of tetracycline-like antibiotics in aquaculture [25,26]. Tetracycline-, amoxicillin-, and azithromycin-resistant Salmonella spp.…”

Section: Discussionmentioning

confidence: 99%

“…Houseflies are very common in fish markets where fishes are cut and the inedible parts of the fish are leftover in the same place. Thus, flies can easily pick up the fish's gut and surface bacteria that may be MDR, since antibiotics are blindly used in aquaculture in Bangladesh [25,26]. These flies can transmit MDR bacteria to other food shops, particularly ready-to-eat foods, creating serious health hazards to humans.…”

Section: Introductionmentioning

confidence: 99%

Molecular Detection and Antibiotyping of Multidrug-Resistant Salmonella Isolated from Houseflies in a Fish Market

et al. 2019

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Houseflies (Musca domestica) are well-known mechanical vectors for spreading multidrug-resistant bacteria. Fish sold in open markets are exposed to houseflies. The present study investigated the prevalence and antibiotypes of multidrug-resistant (MDR) Salmonella spp. in houseflies captured from a fish market. Direct interviews with fish vendors and consumers were also performed to draw their perceptions about the role of flies in spreading antibiotic-resistant bacteria. A total of 60 houseflies were captured from a local fish market in Bangladesh. The presence of Salmonella spp. was confirmed using PCR method. Antibiogram was determined by the disk diffusion method, followed by the detection of tetA, tetB, and qnrA resistance genes by PCR. From the interview, it was found that most of the consumers and vendors were not aware of antibiotic resistance, but reported that flies can carry pathogens. Salmonella spp. were identified from the surface of 34 (56.7%) houseflies, of which 31 (91.2%) were found to be MDR. This study revealed 25 antibiotypes among the isolated Salmonella spp. All tested isolates were found to be resistant to tetracycline. tetA and tetB were detected in 100% and 47.1% of the isolates, respectively. Among the 10 isolates phenotypically found resistant to ciprofloxacin, six (60%) were found to be positive for qnrA gene. As far as we know, this is the first study from Bangladesh to report and describe the molecular detection of multidrug-resistant Salmonella spp. in houseflies in a fish market facility. The occurrence of a high level of MDR Salmonella in houseflies in the fish market is of great public health concerns.

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“…For example, commercial injectable vaccines against GBS are available for tilapia farmers in Brazil, Costa Rica and Indonesia but many farmers in tilapia aquaculture still relying on husbandry techniques to prevent disease rather than vaccination (Aftabuddin et al, 2016;Brudeseth et al, 2013;Chitmanat et al, 2016;Yanong, 2011). When disease outbreaks occur, antibiotics are mainly used to treat fish (Aftabuddin et al, 2016;Chitmanat et al, 2016;Yanong, 2011). Manual vaccination is labor intensive and requires good fish handling skills which can cause high stress (Brudeseth et al, 2013).…”

Section: Chapter 5: General Discussionmentioning

confidence: 99%

“…Currently, it has been approved in Brazil, Costa Rica and Indonesia for tilapia (Aftabuddin et al, 2016;Brudeseth et al, 2013). Although a number of commercial vaccines against S. agalactiae, however it is not available in all countries including Australia where only autogenous vaccines can be used to control streptococcal disease (Brudeseth et al, 2013;Millard et al, 2012).…”

Section: Commercial Streptococcal Vaccines In Aquaculturementioning

confidence: 99%

A pan genome reverse vaccinology approach to prevent Streptococcus agalactiae infection in farmed tilapia

Kawasaki¹

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Streptococcus agalactiae (Group B Streptococcus; GBS) is a Gram-positive pathogenic bacterium that causes disease in a wide range of animals including fish. Outbreaks of GBS in farmed fish have substantial economic impacts on the aquaculture industry, especially in tilapia production, a staple food product in tropical and subtropical low-and middle-income countries and the second most widely farmed fish after carp. Although vaccination can effectively prevent disease caused by GBS in fish it often fails after relatively short periods of use. Capsular polysaccharide (CPS) is the major protective antigen in GBS vaccines and a critical virulence factor. There are currently ten CPS serotypes of GBS and, whilst vaccination against one serotype confers protection in fish, it is not cross-protective against other serotypes. In addition, under the strong selective pressure of vaccination-driven adaptive immunity, evolution of novel serotypes can occur. To improve the serotype crossprotective efficacy of GBS vaccines for aquaculture, I employed a pan-genome reverse vaccinology approach to design candidate serotype-independent protective vaccines based on conserved proteins in fish-pathogenic GBS serotypes. Reverse vaccinology exploits recent advances in genomics to predict antigens in the genome sequence. Reverse vaccinology combined with pan-genome can identify the antigens that are conserved across a diversity of strains of a pathogen.To identify potential vaccine candidate antigens, a pan-genome was constructed for GBS comprising 82 genomes including representative isolates from wild marine fish and stingrays, farm and companion animals and from human clinical cases in Australia, along with isolates from farmed tilapia in Honduras and representative genomes from all current serotypes available via the NCBI Genbank database. Core genome single nucleotide polymorphism 3 (SNP) analysis indicated dissemination of the aquatic host-adapted ST-261 lineage in wild Australian fish from an ancestral tilapia strain, which is congruent with several introductions of tilapia into northern Australia from Israel and Malaysia during the 1970s and 1980s.Aquatic serotype Ib GBS strains have lost many virulence factors during adaptation, but six adhesins, named ST-261 adhesins, were well-conserved across the aquatic isolates and might be critical for virulence in fish and good targets for vaccine development. Three of six ST-261 adhesins were also conserved across all strains including terrestrial isolates and were chosen as vaccine candidates. Expressions of ST-261 adhesin genes were inversely co-regulated with CPS expression dependent upon carbon source and metal ions in the medium. However, gene transcription was not reflective of surface expression as serum antibodies derived in tilapia against recombinant adhesins did not detect similar variation in the level of ST-261 adhesins in whole cell ELISA or Western blot. This may be due to posttranscriptional processing causing a disconnect between gene and protein expression.To evaluate th...

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Fish diseases and strategies taken by the farmers in freshwater aquaculture at southwestern Bangladesh

Cited by 16 publications

References 2 publications

Present status, problems and prospect of fish farming at Gazipur Sadar upazila in Bangladesh

Present status, problems and prospect of fish farming at Gazipur Sadar upazila in Bangladesh

Molecular Detection and Antibiotyping of Multidrug-Resistant Salmonella Isolated from Houseflies in a Fish Market

A pan genome reverse vaccinology approach to prevent Streptococcus agalactiae infection in farmed tilapia

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