Abstract
Fish immunization has been carried out for over 50 years and is generally accepted as an effective method for preventing a wide range of bacterial and viral diseases. Vaccination efforts contribute to environmental, social, and economic sustainability in global aquaculture. Most licensed fish vaccines have traditionally been inactivated microorganisms that were formulated with adjuvants and delivered through immersion or injection routes. Live vaccines are more efficacious, as they mimic natural pathogen infection and generate a strong antibody response, thus having a greater potential to be administered via oral or immersion routes. Modern vaccine technology has targeted specific pathogen components, and vaccines developed using such approaches may include subunit, or recombinant, DNA/RNA particle vaccines. These advanced technologies have been developed globally and appear to induce greater levels of immunity than traditional fish vaccines. Advanced technologies have shown great promise for the future of aquaculture vaccines and will provide health benefits and enhanced economic potential for producers. This review describes the use of conventional aquaculture vaccines and provides an overview of current molecular approaches and strategies that are promising for new aquaculture vaccine development.
Highlights
Despite multiple approaches to innovative therapy, fish diseases remain a major economic issue in commercial aquaculture worldwide
Most of the vaccines have been approved for use by the United States Department of Agriculture (USDA) for a variety of aquaculture species, and the majority of these vaccines utilize conventional production methods that start by culturing target pathogens [14,15]
We describe the use of conventional aquaculture vaccines and provide an overview of molecular approaches to vaccine development that are the most promising for new vaccines for use in aquaculture
Summary
Despite multiple approaches to innovative therapy, fish diseases remain a major economic issue in commercial aquaculture worldwide. Most of the vaccines have been approved for use by the United States Department of Agriculture (USDA) for a variety of aquaculture species, and the majority of these vaccines utilize conventional production methods that start by culturing target pathogens [14,15] This array of vaccines has successfully protected fish against a variety of serious fish diseases. Modern vaccine technology has targeted specific pathogen components, and vaccines developed using such approaches may include subunit or recombinant DNA vaccines that contain novel antigens produced using various expression systems [19,20] Other technologies, such as RNA particle vaccines, have been developed globally and appear to induce greater levels of immunity than traditional vaccine technology [18].
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