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Managing the microbial community of marine fish larvae : a holistic perspective for larviculture

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Abstract
The availability of high-quality juveniles is a bottleneck in the farming of many marine fish species. Detrimental larvae-microbe interactions are a main reason for poor viability and quality in larval rearing. In this review, we explore the microbial community of fish larvae from an ecological and eco-physiological perspective, with the aim to develop the knowledge basis for microbial management. The larvae are exposed to a huge number of microbes from external and internal sources in intensive aquaculture, but their relative importance depend on the rearing technology used (especially flow-through vs. recirculating systems) and the retention time of the water in the fish tanks. Generally, focus has been on microbes entering the system, but microbes from growth within the system is normally a substantial part of the microbes encountered by larvae. Culture independent methods have revealed an unexpected high richness of bacterial species associated with larvae, with 100-250 operational taxonomic units associated with one individual. The microbiota of larvae changes rapidly until metamorphosis, most likely due to changes in the selection pressure in the digestive tract caused by changes in host-microbe and microbe-microbe interactions. Even though the microbiota of larvae is distinctly different from the microbiota of the water and the live food, the microbiota of the water strongly affects the microbiota of the larvae. We are in the early phase of understanding larvae-microbe interactions in vivo, but some studies with other animals than fish emphasize that we so far have underestimated the complexity of these interactions. We present examples demonstrating the diversity of these interactions. A large variety of microbial management methods exist, focusing on non-selective reduction of microbes, selective enhancement of microbes, and on improvement of the resistance of larvae against microbes. However, relatively few methods have been studied extensively. We believe that there is a lot to gain by increasing the diversity of approaches for microbial management. As many microbial management methods are perturbations of the microbial community, we argue that ecological theory is needed to foresee and test for longer term consequences in microbe-microbe and microbe-larvae interactions. We finally make some recommendations for future research and development.
Keywords
GRADIENT GEL-ELECTROPHORESIS, HIPPOGLOSSUS-HIPPOGLOSSUS L., BACTERIAL, CHALLENGE TEST, SCOPHTHALMUS-MAXIMUS L., DICENTRARCHUS-LABRAX L., GNOTOBIOTIC SEA BASS, LACTIC-ACID BACTERIA, GADUS-MORHUA L., VIBRIO-ANGUILLARUM, ATLANTIC HALIBUT, aquaculture, microbial management, microbe-host interactions, microbe-microbe interaction, aquaculture systems, bacterial flows

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Chicago
Vadstein, Olav, Kari JK Attramadal, Ingrid Bakke, Torunn Forberg, Yngvar Olsen, Marc Verdegem, Cristos Giatsis, et al. 2018. “Managing the Microbial Community of Marine Fish Larvae : a Holistic Perspective for Larviculture.” Frontiers in Microbiology 9.
APA
Vadstein, O., Attramadal, K. J., Bakke, I., Forberg, T., Olsen, Y., Verdegem, M., Giatsis, C., et al. (2018). Managing the microbial community of marine fish larvae : a holistic perspective for larviculture. FRONTIERS IN MICROBIOLOGY, 9.
Vancouver
1.
Vadstein O, Attramadal KJ, Bakke I, Forberg T, Olsen Y, Verdegem M, et al. Managing the microbial community of marine fish larvae : a holistic perspective for larviculture. FRONTIERS IN MICROBIOLOGY. 2018;9.
MLA
Vadstein, Olav et al. “Managing the Microbial Community of Marine Fish Larvae : a Holistic Perspective for Larviculture.” FRONTIERS IN MICROBIOLOGY 9 (2018): n. pag. Print.
@article{8591864,
  abstract     = {The availability of high-quality juveniles is a bottleneck in the farming of many marine fish species. Detrimental larvae-microbe interactions are a main reason for poor viability and quality in larval rearing. In this review, we explore the microbial community of fish larvae from an ecological and eco-physiological perspective, with the aim to develop the knowledge basis for microbial management. The larvae are exposed to a huge number of microbes from external and internal sources in intensive aquaculture, but their relative importance depend on the rearing technology used (especially flow-through vs. recirculating systems) and the retention time of the water in the fish tanks. Generally, focus has been on microbes entering the system, but microbes from growth within the system is normally a substantial part of the microbes encountered by larvae. Culture independent methods have revealed an unexpected high richness of bacterial species associated with larvae, with 100-250 operational taxonomic units associated with one individual. The microbiota of larvae changes rapidly until metamorphosis, most likely due to changes in the selection pressure in the digestive tract caused by changes in host-microbe and microbe-microbe interactions. Even though the microbiota of larvae is distinctly different from the microbiota of the water and the live food, the microbiota of the water strongly affects the microbiota of the larvae. We are in the early phase of understanding larvae-microbe interactions in vivo, but some studies with other animals than fish emphasize that we so far have underestimated the complexity of these interactions. We present examples demonstrating the diversity of these interactions. A large variety of microbial management methods exist, focusing on non-selective reduction of microbes, selective enhancement of microbes, and on improvement of the resistance of larvae against microbes. However, relatively few methods have been studied extensively. We believe that there is a lot to gain by increasing the diversity of approaches for microbial management. As many microbial management methods are perturbations of the microbial community, we argue that ecological theory is needed to foresee and test for longer term consequences in microbe-microbe and microbe-larvae interactions. We finally make some recommendations for future research and development.},
  articleno    = {1820},
  author       = {Vadstein, Olav and Attramadal, Kari JK and Bakke, Ingrid and Forberg, Torunn and Olsen, Yngvar and Verdegem, Marc and Giatsis, Cristos and Skjermo, Jorunn and Aasen, Inga M and Gatesoupe, Francois-Joel and Dierckens, Kristof and Sorgeloos, Patrick and Bossier, Peter},
  issn         = {1664-302X},
  journal      = {FRONTIERS IN MICROBIOLOGY},
  language     = {eng},
  pages        = {22},
  title        = {Managing the microbial community of marine fish larvae : a holistic perspective for larviculture},
  url          = {http://dx.doi.org/10.3389/fmicb.2018.01820},
  volume       = {9},
  year         = {2018},
}

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