Article
Fisheries
Taylor Heckman, Khalid Shahin, Eileen E. Henderson, Matt J. Griffin, Esteban Soto
Summary: Streptococcus iniae is a re-emerging bacterial pathogen in freshwater and marine aquaculture worldwide. Currently, in the United States, there are no commercial vaccines available for S. iniae, and autogenous vaccines have limited protection. Serial passage of S. iniae in the presence of rifampin may generate immunogenic live-attenuated vaccines that confer protection against heterologous strains.
FISH & SHELLFISH IMMUNOLOGY
(2022)
Article
Fisheries
Patricia Bwalya, Bernard M. Hang'ombe, Oystein Evensen, Stephen Mutoloki
Summary: In this study, the pathogenesis of L. garvieae in Nile tilapia was assessed, with significant differences observed between re-isolation of bacteria following IP injection and IMM infection. More clinical signs and mortalities were observed in the IP group, highlighting the importance of maintaining fish with intact skin to prevent infections.
JOURNAL OF FISH DISEASES
(2021)
Article
Fisheries
Renata Catao Egger, Julio Cesar Camara Rosa, Luis Fernando Lara Resende, Santiago Benites de Padua, Fernanda de Oliveira Barbosa, Mariana Taise Zerbini, Guilherme Campos Tavares, Henrique Cesar Pereira Figueiredo
Summary: This study investigated lactococcosis outbreaks in Nile tilapia on Brazilian farms and characterized the isolates through multilocus sequence typing (MLST), virulence to Nile tilapia, and antimicrobial susceptibility. The pathogenicity of L. petauri to Nile tilapia was confirmed, and its rapid expansion was observed. Provisional epidemiological cutoff values were determined for L. petauri for six antimicrobial agents from different drug classes.
Article
Fisheries
Rajan Preenanka, Muhammed P. P. Safeena, Rahul Krishnan
Summary: In this study, a novel bacteriophage, Streptococcus phage-1A, was isolated from an infected tilapia farm against S. agalactiae. The phage demonstrated high protective efficiency against the pathogen.
AQUACULTURE INTERNATIONAL
(2023)
Article
Fisheries
Thangaraj Raja Swaminathan, Sundar Raj Nithyanantham, Lekshmi Narendrakumar, Arathi Dharmaratnam, Neeraj Sood, Pravata Kumar Pradhan, Krupesha Sharma Sulumane Ramachandra, Kuldeep Kumar Lal
Summary: This study revealed that co-infection of TiLV and other bacteria may increase mortality in disease outbreaks. This is the first reported co-infection of L. garvieae with TiLV associated with mass mortality in Nile tilapia in India.
DISEASES OF AQUATIC ORGANISMS
(2021)
Article
Fisheries
Mortada M. A. Hussein, Walid H. Hassan, Hosam A. Yassen, Ahmed M. A. Osman
Summary: This study focused on streptococcosis, a bacterial disease in fish, and prepared bacterial ghost vaccines using a chemical method. The evaluation of the vaccines showed significant effects on the fish's immune system and demonstrated good protection in challenge experiments. Therefore, this research provides novel vaccine candidates for the prevention and control of streptococcosis.
FISH & SHELLFISH IMMUNOLOGY
(2023)
Article
Fisheries
Tasmina Akter, Md Javed Foysal, Mahbubul Alam, Rakib Ehsan, Sulav Indra Paul, Farhana Momtaz, Muhammad A. B. Siddik, Alfred Chin Yen Tay, Ravi Fotedar, Sanjay Kumar Gupta, Tofazzal Islam, Md Mahbubur Rahman
Summary: The study reveals distinct differences in bacterial communities between healthy and streptococcosis-infected Nile tilapia, with an increase in Enterococcus abundance in the skin lesions of diseased fish and other bacterial species in the gut. Phylogenetic analysis identified three Enterococcus species as the primary causative agents of streptococcosis. In vivo challenge tests confirmed the high pathogenicity and mortality of these species, and a significant correlation between pathogenicity and sequence divergence in Enterococcus isolates was found.
Review
Microbiology
Ze Zhang
Summary: Streptococcus agalactiae, also known as group B streptococci (GBS), is a severe pathogen that affects both humans and animals, especially in tilapia aquaculture. Research has identified various virulence factors associated with GBS infection, and potential vaccine candidates have been explored.
Article
Fisheries
Tasmina Akter, Rakib Ehsan, Sulav Indra Paul, M. A. A. Ador, Ashikur Rahman, Md Najmul Haque, Md. Tofazzal Islam, Md. Mahbubur Rahman
Summary: This study developed and evaluated a whole cell formalin killed vaccine prepared from Enterococcus faecalis, Enterococcus hirae, and Enterococcus faecium against streptococcosis in Nile tilapia. The vaccine showed effectiveness in reducing mortality rate and enhancing immune response in vaccinated fish. Both intraperitoneal injection and bath immersion methods were proven to be effective for vaccine administration.
AQUACULTURE REPORTS
(2022)
Article
Fisheries
Marco Shizuo Owatari, Lucas Cardoso, Scheila Anelise Pereira, Ulisses de Padua Pereira, Leonardo Tachibana, Mauricio Laterca Martins, Jose Luiz Pedreira Mourino
Summary: This study evaluated three different routes of Streptococcus agalactiae infection in Nile tilapia and found that intraperitoneal and intragastric routes were more aggressive, causing greater brain damage and early mortality, while oral inoculum presented less intensity in brain lesions and a chronic immune response, with longer mortality time. Oral infected-feed administration may be an innovative method for future aquaculture research experiments.
FISH & SHELLFISH IMMUNOLOGY
(2022)
Article
Immunology
Qi Li, Zhiqiang Zhang, Weiqi Fan, Yongxiong Huang, Jinzhong Niu, Guoling Luo, Xinchao Liu, Yu Huang, Jichang Jian
Summary: The study identified a lect2 gene from Nile tilapia (On-lect2) and characterized its roles in the fish's immune response against bacterial infection. On-LECT2 plays important functions in promoting inflammation, reducing tissue damages, and improving survival rate of Nile tilapia during bacterial infection, with the highest transcriptional levels in the liver.
FRONTIERS IN IMMUNOLOGY
(2021)
Article
Biodiversity Conservation
Naor S. Fialho, Wagner C. Valenti, Fernanda S. David, Elisa M. Godoy, Danilo C. Proenca, Rodrigo Roubach, Guilherme Wolff Bueno
Summary: This study evaluated the environmental sustainability of Nile tilapia net-cage farms of different sizes using environmental sustainability indicators and benchmarks. Results showed that environmental sustainability is independent of farm size, with factors like feed composition, management techniques, and water temperature being more critical. The use of benchmarking tools can provide reference values for each environmental sustainability indicator, allowing improvements to reach desirable states.
ECOLOGICAL INDICATORS
(2021)
Article
Fisheries
Dharacha Suwanbumrung, Sudthirak Wongkhieo, Wisawat Keaswejjareansuk, Piroonrat Dechbumroong, Manoj Tukaram Kamble, Teerapong Yata, Sirikorn Kitiyodom, Channarong Rodkhum, Kim D. Thompson, Katawut Namdee, Nopadon Pirarat
Summary: This study aimed to develop a novel cationic-based nanoemulsion vaccine containing bile salts (NEB) coated by chitosan (CS) for oral vaccination of Nile tilapia against S. agalactiae. The NEB-CS vaccine exhibited improved mucoadhesiveness, permeability, and protective efficacy compared to the control group. The results suggest that NEB-CS can be a promising approach to protect tilapia in aquaculture against streptococcosis.
FISH & SHELLFISH IMMUNOLOGY
(2023)
Article
Fisheries
Yanjian Yang, Meng Chen, Zhelin Wu, Defeng Zhang, Huiyan Lin, Xiayi Wei, Biao Han, Zheng Guo, Jianmin Ye
Summary: This study found that the phagocytosis of Streptococcus agalactiae by tilapia macrophages was significantly enhanced in cps-deficient mutant Delta cps and sia-deficient mutant Delta neuA. By dampening the inflammatory response and down-regulating the expression of phagocytic receptors, S. agalactiae could interfere with the phagocytosis of macrophages. These findings provide valuable insights into the defense mechanisms of S. agalactiae against the teleost innate immune system and offer clues for vaccine development.
Article
Fisheries
Nai-tong Yu, Wei-wei Zeng, Zhongguo Xiong, Zhi-xin Liu
Summary: This study successfully cloned TiLV ORF10 into the pcDNA3.1 vector as a vaccine candidate and showed that vaccination with pcDNA3.1-ORF10 can significantly upregulate the transcription levels of immune-related genes, reduce virus replication, and enhance protective effects against TiLV in tilapia.
AQUACULTURE REPORTS
(2022)
