Article
Fisheries
Macarena Echeverria-Bugueno, Rute Irgang, Jorge Mancilla-Schulz, Ruben Avendano-Herrera
Summary: Despite the presence of immune substances in the mucus layer of the fish skin, it is insufficient to resist Tenacibaculum dicentrarchi, leading to Tenacibaculosis in Atlantic salmon. Therefore, greater attention should be given to fish skin mucus as a primary defense mechanism against T. dicentrarchi.
FISH & SHELLFISH IMMUNOLOGY
(2023)
Article
Microbiology
Joseph P. Nowlan, Scott R. Britney, John S. Lumsden, Spencer Russell
Summary: There is limited understanding of the pathogenesis of tenacibaculosis in Atlantic salmon and few reproducible exposure models for comparison. Different species of Tenacibaculum were used to expose Atlantic salmon, showing varied mortality rates and clinical signs. This experimental infection model will be helpful for further research on the pathogenesis, treatment, and immunity of tenacibaculosis.
Article
Fisheries
Bjorn Spilsberg, Hanne K. Nilsen, Saraya Tavornpanich, Snorre Gulla, Mona Dverdal Jansen, Karin Lagesen, Duncan J. Colquhoun, Anne-Berit Olsen
Summary: Skin conditions associated with Tenacibaculum spp. pose a significant threat to sea-farmed Atlantic salmon in Norway. In this study, 15 suspected outbreaks were investigated, confirming the presence of Tenacibaculum spp. Through genetic analysis, T. finnmarkense and T. dicentrarchi were identified, with further differentiation of T. finnmarkense into genovars finnmarkense and ulcerans. The analysis revealed a genetically conserved cluster of T. finnmarkense gv. finnmarkense isolates, suggesting a link between this genotype and the development of clinical tenacibaculosis in sea-farmed Norwegian salmon. Similar genotypic distribution was observed in isolates collected in 2019, indicating a predisposition of small fish shortly after sea transfer to Tenacibaculum infection.
JOURNAL OF FISH DISEASES
(2022)
Article
Fisheries
Monica Saldarriaga-Cordoba, Rute Irgang, Ruben Avendano-Herrera
Summary: Tenacibaculum dicentrarchi is an emerging pathogen that causes high economic losses in the salmon industry in Chile. Comparative analysis of the genome sequences of different strains provides insights into the virulence process of this bacterium.
JOURNAL OF FISH DISEASES
(2021)
Article
Biotechnology & Applied Microbiology
Soren B. Hansen, Davide Bozzi, Sarah S. T. Mak, Cecilie G. Clausen, Tue K. Nielsen, Miyako Kodama, Lars H. Hansen, M. Thomas P. Gilbert, Morten T. Limborg
Summary: Obtaining desired phenotypic traits in aquacultural production of Atlantic salmon is still a challenge, and the presence of host-associated microorganisms might contribute to this challenge. Understanding the factors that shape the microbiota is crucial for manipulating it towards desired host traits. In this study, DNA methylation differences associated with a tenacibaculosis outbreak and microbiota displacement in Atlantic salmon were investigated, revealing potential genes involved in host-microbiota interactions and the importance of considering epigenetic factors in manipulating farmed fish microbiota.
Article
Fisheries
Rute Irgang, Ruben Avendano-Herrera
Summary: This study analyzes the susceptibility patterns of Tenacibaculum dicentrarchi to tiamulin and suggests that tiamulin is a viable alternative to florfenicol for the treatment of tenacibaculosis in the Chilean salmon industry.
JOURNAL OF FISH DISEASES
(2022)
Article
Immunology
Richard I. Walker, A. Louis Bourgeois
Summary: Oral immunization is an effective strategy against mucosal enteric pathogens. Inactivated whole bacterial cells can also induce protective immunity. Developing a safe and simple delivery format with controlled immunogenic amounts of complex antigens is essential. Enhancing the efficacy of whole cell vaccines can be achieved through genetic engineering and the use of mucosal adjuvants. The development of ETVAX, a vaccine candidate against enterotoxigenic Escherichia coli (ETEC), has shown promising results.
FRONTIERS IN IMMUNOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Peng Yin, Bjorn Thrandur Bjornsson, Per Gunnar Fjelldal, Takaya Saito, Sofie Charlotte Remo, Rolf Brudvik Edvardsen, Tom Hansen, Sandeep Sharma, Rolf Erik Olsen, Kristin Hamre
Summary: Accumulating evidence suggests a close relationship between oxidative stress and growth rate in fish, but the underlying mechanisms are not clear. This study investigated the combined effect of dietary antioxidants and growth hormone (GH) on the redox status of liver and muscle in Atlantic salmon. The results show that GH implantation decreases vitamin C and E levels, increases oxidative stress in the liver, and affects the expression of genes and pathways related to antioxidant enzymes and redox balance. Dietary antioxidants do lower oxidative stress but have no effect on the growth rate.
Article
Multidisciplinary Sciences
Tormod Haraldstad, Torbjorn Forseth, Esben M. Olsen, Thrond O. Haugen, Erik Hoglund
Summary: This study provides empirical support for the sequential imprinting hypothesis in Atlantic salmon, suggesting that the migration route during the smolt stage can have a significant impact on the subsequent spawning migration. These findings emphasize the importance of ensuring the successful return of adult salmon to their natal spawning grounds.
SCIENTIFIC REPORTS
(2022)
Article
Immunology
Danixa Martinez, Ricardo Oyarzun-Salazar, Ana Maria Quilapi, Jose Coronado, Ricardo Enriquez, Carolina Vargas-Lagos, Cristian Oliver, Natacha Santibanez, Marcos Godoy, Jose Luis Munoz, Luis Vargas-Chacoff, Alex Romero
Summary: This study evaluated the activation of nutritional immunity in Atlantic salmon stimulated with live and inactivated Piscirickettsia salmonis. The results showed that both live and inactivated P. salmonis could activate nutritional immunity, and there was no distinction between the two. Genetic material of P. salmonis was detected in the liver tissue of the fish. The hematocrit percentage decreased in fish stimulated with live P. salmonis, while it remained unchanged in fish stimulated with inactivated P. salmonis. Plasma iron content decreased in both experimental groups, but the decrease was statistically significant only at 3 dpi. Immune-nutritional markers were modulated in both experimental conditions, while other markers were down-regulated. Intracellular iron content increased in the liver at 7 and 14 dpi, while zinc content decreased at 14 dpi in both experimental groups. However, manganese content was not altered by the stimulation. These findings suggest that nutritional immunity responds similarly to live and inactivated P. salmonis, and may be self-activated by the detection of PAMPs rather than a sequestration and/or competition of micronutrients by the living microorganism.
FRONTIERS IN IMMUNOLOGY
(2023)
Article
Fisheries
E. Holen, M. Chen, P. G. Fjelldal, K. Skjaerven, N. H. Sissener, S. Remo, A. J. Prabhu, K. Hamre, V. Vikesa, S. Subramanian, M. Espe
Summary: The study shows that freshwater diets can affect the immunity of Atlantic salmon, with immune modulating amino acid diets helping to increase the transcription levels of immune genes and combat bacterial or viral infections.
FISH & SHELLFISH IMMUNOLOGY
(2022)
Article
Environmental Sciences
Marcell Szabo-Meszaros, Ana T. Silva, Kim M. Baerum, Henrik Baktoft, Knut Alfredsen, Richard D. Hedger, Finn Okland, Karl O. Gjelland, Hans-Petter Fjeldstad, Olle Calles, Torbjorn Forseth
Summary: The study demonstrated that fish swimming direction is influenced by similar hydraulic parameters and their interactions in the Orkla and Mandal river systems, but local parametrization of the base model is necessary.
Article
Fisheries
Andrew W. Bateman, Amy K. Teffer, Arthur Bass, Tobi Ming, Karia Kaukinen, Brian P. Hunt, Martin Krkosek, Kristina M. Miller
Summary: Juvenile sockeye salmon migrating near salmon farms in the Discovery Islands region of British Columbia show high detection rates of the bacterium Tenacibaculum maritimum. The infection pressure from farmed salmon is significantly higher than from other sources, indicating the need for better management of farm-wild interactions.
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
(2022)
Article
Engineering, Marine
Brian G. Sanderson, Richard H. Karsten, Cameron C. Solda, David C. Hardie, Daniel J. Hasselman
Summary: This study uses acoustic telemetry to quantify the probability of encounters between salmon and marine hydrokinetic (MHK) turbines in Minas Passage, Bay of Fundy.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Ecology
Hannele M. Honkanen, Danielle L. Orrell, Matthew Newton, Simon McKelvey, Alastair Stephen, R. Alistair Duguid, Colin E. Adams
Summary: The study found that the success rate of Atlantic salmon migration through standing waters is generally low, possibly due to a lack of navigational cues. The impact of impounded lakes on Atlantic salmon migration is not significantly different from that of naturally draining lakes, and may depend more on factors such as lake basin shape, exit route, and navigational cues available to the fish.
ECOLOGICAL ENGINEERING
(2021)
Article
Fisheries
Hunter S. Bailey, Ashley N. Fincannon, Lee A. Fuiman
Summary: This study investigated the transfer of fatty acids from broodstock diets to eggs and the time needed for the eggs to equilibrate to the diet in Southern flounder. The findings indicate that different diet treatments significantly affect the fatty acid composition of eggs, and it takes 8-16 weeks for the eggs to adapt to changes in the adult diet. These results are important for improving broodstock diets and feeding protocols in stock-enhancement programs.
Article
Fisheries
Yu Liu, Mingtao Lei, Hector Victor, Yan Wang
Summary: This study confirms the feasibility of replacing raw fish diet with a formulated diet in commercial farming of large yellow croaker, which can increase fish survival and yield, and reduce feed cost and body lipid deposition.
Article
Fisheries
Xiaoyan Zhang, Lize San, Yucong Yang, Yuehong Tao, Jiangong Ren, Yufeng Liu, Zhongwei He, Jiashuo Di, Ziteng Pei, Guixing Wang, Jilun Hou
Summary: Gynogenesis is an effective technique for establishing homogeneous lines and confirming potential chromosomal mechanisms of sex determination in fish. This study successfully induced gynogenetic families in Thamnaconus modestus and established a complete method for gynogenesis induction.
Article
Fisheries
Julieta C. Martinelli, Megan Considine, Helen R. Casendino, Carolyn M. Tarpey, Isadora Jimenez-Hidalgo, Jacqueline L. Padilla-Gamino, Teri L. King, Lorenz Hauser, Steven Rumrill, Chelsea L. Wood
Summary: Shell-boring polychaetes have caused significant damage to mariculture operations worldwide, particularly in the US Pacific region. This study provides a comprehensive dataset on the prevalence, species distribution, and environmental associations of these parasites, highlighting the impact of season, culturing methods, and environmental factors on infestation.
Article
Fisheries
Juan Gao, Xueshan Li, Kangle Lu, Kai Song, Jian Zhang, Ling Wang, Chunxiao Zhang
Summary: This study investigated the effects of dietary protein levels on growth performance, antioxidant capacity, digestive enzyme activity, and metamorphosis rate of bullfrog tadpoles. The optimal dietary protein level for bullfrog tadpoles was estimated to be 42.49%-46.50% of the diet.
Article
Fisheries
Qiang Li, Lijun Duan, Dongsheng Jin, Yuxin Chen, Yirong Lou, Qianjin Zhou, Zhongjie Xu, Fangjie Chen, Hongxian Chen, Guizong Xu, Maocang Yan, Guanjun Yang, Jianfei Lu, Yanjun Zhang, Jiong Chen
Summary: This study developed a centrifugal microfluidic chip with on-chip RPA to detect five pathogenic microorganisms. The chip enabled the parallel analysis of six genetic markers from a single sample and allowed for the highly automated detection of multiple samples. Compared with PCR and DNA sequencing, the on-chip RPA assay showed high sensitivity and specificity for detecting multiple pathogens in shrimp aquaculture.
Article
Fisheries
Xingchen Huo, Pengxu Wang, Fengxia Zhao, Qian Liu, Qingqing Tian, Lingjie Tang, Maolin Lv, Zhaohui Wei, Chunrong Yang, Jianguo Su
Summary: Bacterial diseases in aquaculture ponds have negative effects on sustainable development. The use of composite I20 biotherapy has been shown to effectively treat bacterial diseases in bullfrog ponds, providing a new strategy for controlling bacterial diseases in aquaculture.
Article
Fisheries
Peng Yin, Takaya Saito, Per Gunnar Fjelldal, Bjorn Tharandur Bjornsson, Sofie Charlotte Remo, Sandeep Sharma, Rolf Erik Olsen, Kristin Hamre
Summary: This study aims to investigate the effect of seasonal changes in temperature and photoperiod on the redox metabolism of Atlantic salmon at the molecular level. The research findings suggest that the changing photoperiod and temperature influenced the redox metabolism of Atlantic salmon, highlighting the importance of oxidative status in the ecological implications.
Article
Fisheries
Nicholas Oppong Mensah, Jeffery Kofi Asare, Emmanuel Tetteh-Doku Mensah, Ernest Christlieb Amrago, Frank Osei Tutu, Anthony Donkor
Summary: This study investigates aquaculture farmers' preference for climate-smart aquaculture insurance products, the challenges they face, and their preferred insurance coverage. The results show that farmers prefer Climate-Induced Aquaculture Stock Mortality Insurance and the most significant constraint is the delay in claim settlement.
Article
Fisheries
Qiu-Ping Chai, Pei Wu, Wei-Dan Jiang, Yang Liu, Hong-Mei Ren, Xiao-Wan Jin, Lin Feng, Xiao-Qiu Zhou
Summary: The study found that appropriate levels of potassium diformate (KDF) can enhance the immune defense and mediate the inflammatory process in fish, possibly through the regulation of T cell differentiation via JAK-STAT and NF-kappa B signaling pathways.
Article
Fisheries
Tian Zhu, Haomin Jia, Haopeng Zhang, Yujing Xiao, Cui Han, Jiaxin Yang
Summary: Chicken manure has significant effects on the cultivation of Chlorella and rotifers. The optimal amount of chicken manure extract for continuous cultivation is 10 mLL-1. Chicken manure can promote the growth of Chlorella and improve the fatty acid composition, indirectly enhancing the growth condition and fatty acid content of rotifers.
Article
Fisheries
Zheng Luo, Yang Yu, Zhenning Bao, Fuhua Li
Summary: This study analyzed the heritability and genetic correlation of two growth traits in Pacific white shrimp and evaluated the genomic prediction using different genomic selection models. The results showed that the NeuralNet model had the highest prediction accuracy and better prospects for predicting shrimp growth traits.
Article
Fisheries
Alberto Ruiz, Ignasi Sanahuja, Karl B. Andree, Dolors Furones, Paul G. Holhorea, Josep A. Calduch-Giner, Jose J. Pastor, Marc Vinas, Jaume Perez-Sanchez, Sofia Morais, Enric Gisbert
Summary: Supplementing diets with a combination of spice oleoresins can reduce lipid accumulation and inflammation in farmed fish. The combination of spice oleoresins also has an immunomodulatory effect on the fish's intestinal immune system, potentially offering anti-inflammatory benefits.
Article
Fisheries
Beibei Zhao, Renhui Mei, Le Li, Di Hu, Lei Li
Summary: This study reveals that JfCXCL8_L1a and JfCXCL8_L1b have different immune pathways, and JfCXCL8_L1b plays a significant role in enhancing the adaptive immunity of T cell-dependent antigen.
Article
Fisheries
Yuhang Liu, Danying Cao, Nan Wu, Xuyang Zhao, Qingsong Zhu, Lian Su, Fatima Altaf, Qianqian Zhang, Haokun Liu, Yongming Li, Bruno Hamish Unger, Yingyin Cheng, Wanting Zhang, Aihua Li, Yaping Wang, Xiao-Qin Xia
Summary: Based on previous research, sinomenine has been found to protect mucosal immunity in farmed fish species by preventing intestinal pathological changes and regulating gene expression related to inflammation. It also enhances immune homeostasis and controls the growth of pathogenic bacteria.