Article
Fisheries
Kooloth Valappil Rajendran, Neeraj Sood, B. Madhusudhana Rao, Anisha Valsalam, Megha K. Bedekar, Kezhedath Jeena, Pravata Kumar Pradhan, Anutosh Paria, Thangaraj Raja Swaminathan, Dev Kumar Verma, Naresh Kumar Sood
Summary: Tilapia parvovirus (TiPV) has been detected in farmed Nile tilapia in two regions of India, Maharashtra and Uttar Pradesh. In Maharashtra, the infected fish showed characteristic clinical signs and TiPV was detected with Tilapia lake virus (TiLV) and/or Aeromonas spp. In Uttar Pradesh, only TiPV was detected in apparently healthy fish. The virus was found in various tissues and could be successfully propagated in a cell line. This is the third country, after China and Thailand, to report the presence of TiPV. The co-infection of TiPV and TiLV in Nile tilapia suggests a potential synergistic effect. Further research is needed to understand the virulence, host-specificity, and epidemiological risk factors of this emerging virus.
JOURNAL OF FISH DISEASES
(2023)
Article
Environmental Sciences
Mohamed F. A. Elazab, Abdelgayed M. Younes, Alkhateib Y. Gaafar, Alaa Z. Abu-Bryka, Mohamed M. Abdel-Daim
Summary: The immune-suppressed model of Nile tilapia can be induced by intraperitoneal injection of Cyclophosphamide at a dosage of 200 mg/kg BW, leading to significant decreases in various immune-related parameters.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(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
Immunology
Alaa Eldin Eissa, Marwa M. Attia, Mamdouh Y. Elgendy, Gehad A. Ismail, Nader M. Sabry, Abdelbary Prince, Mahmoud A. Mahmoud, Ghada O. El-Demerdash, Mohamed Abdelsalam, Hassan I. M. Derwa
Summary: The study on farmed Nile tilapia from a commercial fish farm in Port Said, Egypt, revealed prevalent stress-triggered concurrent bacterial and parasitic infections. Bacteriological, parasitological, and pathological examinations confirmed the presence of Enterococcus fecalis, Streptococcus agalactiae, Centrocestus formosanus, and Myxobolus tilapiae in the sampled fish. The co-infections were likely caused by deleterious environmental conditions.
MICROBIAL PATHOGENESIS
(2021)
Article
Agriculture, Dairy & Animal Science
Elisabeth de Aguiar Bertaglia, William Eduardo Furtado, Angela Teresa Silva e Souza, Manoela Clemente Fernandes, Scheila Anelise Pereira, Elenice Martins Brasil, Jose Luiz Pedreira Mourino, Gabriela Tomas Jeronimo, Mauricio Laterca Martins
Summary: The aim of this study was to investigate the impact of abiotic and biotic factors in a tropical region on the rate of monogenean parasitism in Nile tilapia that are farmed in net cages. A total of 240 sexually reversed fish were analyzed, with 20 fish collected from each culture stage during each sampling month. The results showed that higher parasitic infection values were observed in colder seasons with lower precipitation, and autumn had the highest parasitic infection values compared to other seasons. The occurrence of monogenean parasites showed a negative correlation with season but a positive correlation with culture stage.
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
Evolutionary Biology
Agustin Barria, Carolina Penaloza, Athina Papadopoulou, Mahirah Mahmuddin, Andrea Doeschl-Wilson, John A. H. Benzie, Ross D. Houston, Pamela Wiener
Summary: This study used a whole-genome pooled sequencing (Poolseq) approach to investigate the genetic structure and selection signatures in Nile tilapia populations, with a focus on the GIFTw strain developed by WorldFish. The study also examined important farmed strains from The Philippines and Africa. The findings revealed genetic differentiation between Asian and African populations, as well as genomic regions associated with muscle-related traits and fillet yield.
EVOLUTIONARY APPLICATIONS
(2023)
Article
Fisheries
Mamdouh Y. Elgendy, Mohamed Abdelsalam, Amany M. Kenawy, Shimaa E. Ali
Summary: This study investigated the outbreak of V. mimicus in farmed Nile tilapia in Egypt. The pathogen was found to be resistant to multiple antibiotics and caused high mortality. These findings provide a basis for controlling and preventing this disease.
AQUACULTURE INTERNATIONAL
(2022)
Article
Ecology
Agustin Barria, Trong Quoc Trinh, Mahirah Mahmuddin, Carolina Penaloza, Athina Papadopoulou, Ophelie Gervais, V. Mohan Chadag, John A. H. Benzie, Ross D. Houston
Summary: Enhancing host resistance to infectious disease through genetic markers presents a potential genetic solution for disease control in farmed animals, as demonstrated in a study on resistance to Tilapia lake virus in Nile tilapia.
Article
Biochemistry & Molecular Biology
Amanda Rodrigues dos Santos Magnabosco, Ester Inacio Damiao Quinova, Matheus Victor Viana de Melo, Paulo Eduardo da Silva Bastos, Thamiris Pinheiro Santos, Ivanildo Inacio da Silva Junior, Andre Lucas Correa de Andrade, Renata Meireles Oliveira Padilha, Jadson Freitas da Silva, Fabricio Bezerra de Sa, Marilia Ribeiro Sales Cadena, Pabyton Goncalves Cadena
Summary: This study developed a food additive for sex reversal of Nile tilapia using a simple nanoemulsion, which successfully induced sex reversal in tilapia with promising results.
FISH PHYSIOLOGY AND BIOCHEMISTRY
(2022)
Article
Environmental Sciences
Sven Wuertz, Cem Hinrich Pahl, Werner Kloas
Summary: Commercially produced black soldier flies have potential as a fish meal substitute, especially when utilizing agricultural by-products and waste. Different substrates used for the cultivation of the flies significantly affect their growth and meal quality, but when incorporated in isonitrogenous and isocaloric diets, there were no significant differences in the growth performance of the fish.
Article
Immunology
Nehal A. Younis, Mamdouh Y. Elgendy, Salma I. El-Samannoudy, Mohamed Abdelsalam, Marwa M. Attia
Summary: Motile aeromonads and Cyathocotylidae spp. co-infections were found in farmed Nile tilapia suffering from mortalities. Moribund fish showed signs of septicemia, skin irritations, and respiratory distress. Bacteriological examination revealed infections with Aeromonas hydrophila, A. sobria, and A. caviae, while Cyathocotylidae spp. encysted metacercaria were found in parasitological examination. High levels of interleukin 6 (IL-6) and cluster of differentiation 4 (CD4) were noticed in fish with co-infection. The study provides valuable information for managing these pathogens in order to protect fish health.
MICROBIAL PATHOGENESIS
(2023)
Article
Fisheries
Lan Li, Along Gao, Jianlin Chen, Yang Lei, Liting Wu, Jianmin Ye
Summary: The study identified a CD5 homologue in Nile tilapia, named OnCD5, which plays a crucial role in immune function, especially highly expressed in B lymphocytes.
DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY
(2022)
Article
Physiology
Haojun Zhu, Jun Qiang, Quanjie Li, Zhijuan Nie, Jiancao Gao, Yi Sun, Gangchun Xu
Summary: This study investigates the effects of different culture modes on the gut microbiome of genetically improved farmed tilapia (GIFT) in China. The results show that the gut microbiota composition gradually separates under in-pond raceway system (IPRS) and pond culture system (PCS) conditions, with different responses in the midgut and hindgut bacteria. The alpha-diversity in hindgut decreases significantly in PCS-reared fish compared to IPRS fish. The culture modes also affect the taxonomic profile and metabolic functions of the gut bacteria. Overall, this study provides insights into the characteristics of gut microbiota in GIFT under different culture modes.
FRONTIERS IN PHYSIOLOGY
(2022)
Article
Agriculture, Dairy & Animal Science
Tong Wang, Nannan Zhou, Junyi He, Zhenzhen Hao, Chentao Zhou, Yidi Du, Zhenyu Du, Xiaoyun Su, Meiling Zhang
Summary: This study aimed to investigate whether xylanase can alleviate the adverse effects on the gut barrier induced by soybean meal in Nile tilapia and to explore the possible mechanism. The results showed that dietary xylanase improved intestinal morphology and decreased the concentration of lipopolysaccharide (LPS) in serum by inhibiting the perk/atf4 signaling pathway and up-regulating the expression of mucin2 (MUC2), which enhanced the gut barrier function of Nile tilapia.
JOURNAL OF ANIMAL SCIENCE AND BIOTECHNOLOGY
(2023)