Review
Biochemistry & Molecular Biology
Trevor J. Hamilton, Joshua Szaszkiewicz, Jeffrey Krook, Jeffrey G. Richards, Kevin Stiller, Colin J. Brauner
Summary: The study found that rearing coho salmon under continuous light (24:0) resulted in negligible behavioral alterations compared to rearing under normal light-dark conditions (12:12) at different salinities. This suggests that continuous light may not significantly impact the behavior of fish in Recirculating Aquaculture Systems (RAS) compared to normal light-dark conditions.
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
(2022)
Article
Environmental Sciences
Marlene Lorgen-Ritchie, Michael Clarkson, Lynn Chalmers, John F. Taylor, Herve Migaud, Samuel A. M. Martin
Summary: This study analyzed temporal changes in the microbiome associated with the intestine in Atlantic salmon during smolt production, finding a sharp decline in microbial diversity 1-week post-seawater transfer (SWT) followed by re-establishment with a different community structure after 4 weeks. Core microbial taxa were classified into three categories: omnipresent, salinity specific, and transient. Additionally, an increase in microbial richness in the water was observed, possibly due to a temporal increase in organic load, while dominance of Vibrionaceae was attributed to higher temperatures during RAS production.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Fisheries
Ruixiang Zhao, Jane E. Symonds, Seumas P. Walker, Konstanze Steiner, Chris G. Carter, John P. Bowman, Barbara F. Nowak
Summary: The feed ration is crucial for fish growth performance and gut health, while temperature significantly affects water microbiota. The faecal microbiota is stable, distinct from water or feed microbiota, and dominated by Photobacterium piscicola in samples with higher water content.
Article
Fisheries
Curtis Crouse, Anna Knight, Travis May, John Davidson, Christopher Good
Summary: This study aimed to compare the performance and processing metrics of different genetic rainbow trout strains (including diploid and triploid) raised in freshwater RAS under different light conditions. The results showed that strain, ploidy, and light conditions all had an impact on growth and fillet composition. These findings provide guidance for rainbow trout RAS producers in making informed decisions on harvest size targets and selection of fish strains or ploidy.
AQUACULTURE REPORTS
(2023)
Article
Fisheries
Curtis Crouse, John Davidson, Christopher Good
Summary: Despite limited understanding of economic feasibility, there is increasing investment and use of land-based recirculating aquaculture systems (RAS) for producing market-size Atlantic salmon. High incidence of early maturing fish is a profitable obstacle for this production method, therefore well-defined RAS-specific water temperature thresholds are needed to minimize early maturation.
Article
Microbiology
Ruixiang Zhao, Jane E. Symonds, Seumas P. Walker, Konstanze Steiner, Chris G. Carter, John P. Bowman, Barbara F. Nowak
Summary: This study investigated the change of gut and water microbiota in freshwater recirculating aquaculture systems (RAS) for 7 months in Chinook salmon (Oncorhynchus tshawytscha) and evaluated the influence of fish health and growth performance on gut microbial communities. The results showed that gut microbial diversity increased significantly with fish growth, and the dominant gut microbiota shifted from Firmicutes to Proteobacteria, while Proteobacteria constantly dominated the water microbiota. Photobacterium sp. was identified as the core gut microbiota for freshwater farmed Chinook salmon. The study also found a possible link between dysbiosis and gut microbiota in Chinook salmon.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Shi-Jian Fu, Yun-Wei Dong, Shaun S. Killen
Summary: The ecological relevance of aerobic scope in fish is closely related to habitat and lifestyle, with fast-flowing aquatic habitats favoring species with high aerobic scope and anaerobic capacity for locomotion, while slow-flowing habitats may favor hypoxia tolerance at the expense of reduced locomotor capacity.
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Wilasinee Kotcharoen, Takahiro Watari, Nur Adlin, Yoshinobu Nakamura, Penpicha Satanwat, Wiboonluk Pungrasmi, Sorawit Powtongsook, Yutaka Takeuchi, Masashi Hatamoto, Shinichi Yamazaki, Takashi Yamaguchi
Summary: The study found that the DHS and USB reactors can effectively remove nitrogen under different salinity conditions. Results on water quality and fish growth indicate that the best nitrogen removal efficiency and highest daily weight gain of fish were achieved at 15%o salinity.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2021)
Article
Fisheries
Vasco C. Mota, Maia L. Eggen, Carlo C. Lazado
Summary: This study evaluated the effects of acute PAA exposure on Atlantic salmon parr, finding that the no-observed-effect concentration for PAA should be below 1.6 mg/L. The toxicity of PAA-based disinfectants is influenced by their acidified nature, which may interfere with the water pH in low alkalinity aquaculture systems. Further research is needed to assess the long-term health and welfare consequences of PAA exposure in Atlantic salmon parr.
Article
Biochemistry & Molecular Biology
A. J. Bowden, M. B. Adams, S. J. Andrewartha, N. G. Elliott, P. B. Frappell, T. D. Clark
Summary: The study found that as amoebic gill disease progresses, the basal energy requirements of Atlantic salmon increase, aerobic scope decreases, and hypoxia tolerance weakens.
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Anne Beemelmanns, Fabio S. Zanuzzo, Xi Xue, Rebeccah M. Sandrelli, Matthew L. Rise, A. Kurt Gamperl
Summary: Increasing temperature to 20 degrees C alone, and in combination with hypoxia, resulted in differential expression of genes involved in similar pathways in Atlantic salmon. However, heat shock and immune-related genes in fish exposed to 20 degrees C and hypoxia were more affected, and strongly related to phenotypic characteristics such as growth. This study provides valuable information on how environmental challenges affect the expression of stress-, metabolic- and immune-related genes in fish, identifying potential biomarker genes for fish health and welfare improvement.
Article
Marine & Freshwater Biology
Carlo C. Lazado, Kevin T. Stiller, Britt-Kristin Megard Reiten, Joao Osorio, Jelena Kolarevic, Lill-Heidi Johansen
Summary: The study found that continuous ozonation in a brackish water recirculating aquaculture system had minimal physiological perturbations on Atlantic salmon post-smolts, with no significant difference in survival rates and average weight compared to the control group. Histological evaluations showed better gill health status in the ozone-treated group, while mucosal transcriptomics revealed distinct response profiles between gills and skin.
AQUATIC TOXICOLOGY
(2021)
Article
Fisheries
Teng Guo, Yanfeng Wang, Ping Jiang, Jun Li, Qinghua Liu, Liang Chi
Summary: This study explores the impact of photoperiod on the gonadal development and somatic growth of Atlantic salmon in recirculating aquaculture systems (RASs), specifically focusing on the role of microRNA-155 as a regulator in photoperiodic reproduction. The results show that longer photoperiods positively affect gonadal development in Atlantic salmon, as indicated by higher gonadosomatic index values and a higher proportion of mature fish. Additionally, the expression of hypothalamic miR-155 is influenced by the photoperiod and is involved in the regulation of photoperiod reproduction through targeting brain-derived neurotrophic factor (BDNF) and suppressing gonadal axis-related genes.
Article
Agricultural Engineering
Talvikki Suhonen, Raed A. Al-Juboori, Antonina Kruglova, Jani Pulkkinen, Jouni Vielma, Anna Mikola
Summary: This study evaluates the feasibility of using aerobic granular sludge (AGS) to treat recirculating aquaculture system (RAS) effluent. The AGS process shows promising results for nutrient removal, with the ability to restore performance after acclimating to a change in feed. Illumina sequencing reveals diverse microbial communities in the AGS, indicating its potential for heterotrophic, denitrifying, and phosphorus-accumulating processes. Further development is needed to address energy consumption in aeration and carbon addition.
AQUACULTURAL ENGINEERING
(2023)
Article
Fisheries
Thomas W. K. Fraser, Tom J. Hansen, Per Gunnar Fjelldal
Summary: Pre-harvest male maturation of Atlantic salmon is regulated by both environment and genetics, such as vgll3. The study examined different vgll3 genotypes of salmon in three different environmental regimes and found that the maturation rate was highest under elevated temperature and continuous light conditions, while it was lowest under sea transfer conditions. Furthermore, a small percentage of phenotypic and genetic female salmon were found, and when crossed with XY male, they produced viable progeny with an equal sex ratio of approximately 50/50.
Article
Biochemistry & Molecular Biology
Sang Hyuck Lee, Mi Ae Kim, Young Chang Sohn
Summary: This study characterized the CCAP signaling system in Pacific abalone and revealed its relationship with the calcium/PKC and cAMP/PKA signal transduction pathways. It provides new insights into the evolutionary origins of the NPS and OT/VP signaling systems in protostomes.
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
(2024)
Article
Biochemistry & Molecular Biology
Hanna Scheuffele, Erica V. Todd, John A. Donald, Timothy D. Clark
Summary: Global warming is causing an increase in extreme weather events, affecting ecosystems and the behavior of ectotherms. More research is needed to understand the impact of diurnal thermal variability and improve climate change predictions.
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
(2024)
Article
Biochemistry & Molecular Biology
Jaakko Haverinen, Ahmed Badr, Markus Eskelinen, Matti Vornanen
Summary: The acclimatization of certain ectothermic vertebrates to winter conditions involves reduced energy consumption, achieved through decreased movement activity, depression of cellular functions, or switching to anaerobic energy production. This study on crucian carp showed that winter-acclimatized fish exhibited lower metabolic rates and a shift to anaerobic energy production during anoxia. Winter dormancy in crucian carp is achieved through active reduction of energy consumption, a slowed metabolic rate, and a direct response to oxygen absence.
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
(2024)
Article
Biochemistry & Molecular Biology
Maria Cruz Sueiro, Cynthia A. Awruch, Gustavo M. Somoza, Walter S. Svagelj, Maria G. Palacios
Summary: According to life-history theory, there might be different immunological strategies between reproductive and non-reproductive periods due to limited resources. Our study on two sympatric marine fish species, rockfish and sandperch, found that reproductive individuals showed lower immune function, but higher levels of natural antibodies in rockfish females, compared to their non-reproductive counterparts. On the other hand, reproductively active sandperch males showed lower levels of natural antibodies and higher neutrophil to lymphocyte ratio and spleen index compared to non-reproductive males. The study highlights the species-specific patterns of immunity and the potential influence of resource limitation and abiotic factors on immune trade-offs in fish.
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
(2024)
Article
Biochemistry & Molecular Biology
James B. Cummins, Dane A. Crossley II
Summary: This study focuses on cardiovascular development in altricial bird species, which has been less studied compared to precocial species. The researchers investigated the cholinergic and adrenergic receptor mediated control of arterial blood pressure and heart rate in the neotropic cormorant. The findings suggest that both cholinergic and adrenergic tone play a role in cardiovascular regulation in embryonic birds.
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
(2024)
Article
Biochemistry & Molecular Biology
Ru Xia, Hong-Kang Liu, Xi-Feng Liu, Xin Deng, Chuan-Jie Qin, Yuan-Fa He, Shi-Mei Lin, Yong-Jun Chen
Summary: This study cloned the genes encoding glucokinase and glucose-6-phosphatase catalytic subunit in largemouth bass, revealing their distribution and transcriptional regulation. The results showed that the functions of G6pc and Gck in LMB were highly conserved in evolution, and the interconversion of glucose and G6P in the liver was well regulated at the transcript level under high starch diet, but a futile cycle was induced after a glucose load.
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
(2024)