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Current Status of Fish Vaccines in Japan

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Current Status of Fish Vaccines in Japan Fish and Shellfish Immunology 95 (2019) 236–247 Contents lists available at ScienceDirect Fish and Shellfish Immunology journal homepage: www.elsevier.com/locate/fsi Full length article Current status of fish vaccines in Japan T ∗ Yuta Matsuura, Sachiko Terashima, Tomokazu Takano, Tomomasa Matsuyama Research Center of Fish Diseases, National Research Institute of Aquaculture, Japan Fisheries Research and Education Agency, Minami.-Ise, Mie, Japan ARTICLE INFO ABSTRACT Keywords: Aquaculture is an important industry in Japan for the sustainable production of fish. It contributes to the di- Aquaculture versity of Japanese traditional food culture, which uses fish such as “sushi” and “sashimi”. In the recent Fish diseases aquaculture setting in Japan, infectious diseases have been an unavoidable problem and have caused serious Fish vaccines economic losses. Therefore, there is an urgent need to overcome the disease problem to increase the productivity Bacterial hemolytic jaundice of aquaculture. Although our country has developed various effective vaccines against fish pathogens, which Bacterial cold-water disease have contributed to disease prevention on fish farms, infectious diseases that cannot be controlled by conven- Erythrocytic inclusion body syndrome ff Nocardia tional inactivated vaccines are still a problem. Therefore, other approaches to developing e ective vaccines Piscine orthoreovirus other than inactivated vaccines are required. This review introduces the vaccine used in Japan within the context Plecoglossus altivelis poxvirus-like virus of the current status of finfish aquacultural production and disease problems. This review also summarizes the current research into vaccine development and discusses the future perspectives of fish vaccines, focusing on the problems associated with vaccine promotion in Japan. 1. Introduction 2. General overview of aquaculture in Japan Various marine and freshwater fish species have been cultured in 2.1. Trends in aquacultural production Japan in recent years, including about 30 marine species [1]. Because various kinds of fish are cultured throughout the coastal and freshwater Because it allows sustainable production, aquaculture has become areas of Japan, diverse infectious diseases have been reported in a more important than ever, especially as fisheries production has de- variety of species [2–5]. Today, antibiotics are essential for the treat- clined dramatically with the exhaustion of fish resources and/or en- ment of bacterial infections in aquaculture. However, the Japanese vironmental changes. Aquacultural production accounted for more than Government recently formulated a national action plan on anti- 20% of the total national fisheries production and 30% of the total microbial resistance (AMR) and has encouraged the development of fish national fisheries value in Japan for the last decade or more (Fig. 1A). vaccines as an alternative to antibiotic use (https://www.mhlw.go.jp/ Marine finfish aquaculture in Japan accounts for around 90% of its total file/06-Seisakujouhou-10900000-Kenkoukyoku/0000138942.pdf). finfish production because Japan is an island nation, with many coastal Under these circumstances, it is not only necessary to develop vaccines, areas suitable for marine aquaculture, and has a diverse food culture but also to make the rules for approving existing vaccines for multiple based on marine fish. The aquaculture industry includes fish species species more flexible, efficient, and rapid to effectively prevent the that are predominantly produced in Japan, including those from the many infectious diseases of fish, including both viral and bacterial in- genus Seriola, such as the yellowtail (Seriola quinqueradiata), greater fections. In this paper, we summarize the current status of fish vaccines amberjack (S. dumerili), and yellowtail kingfish (S. lalandi), and other and the issues involved, focusing on the characteristics of recent fish important fish species, such as the red seabream (Pagrus major). Seriola diseases and trends in Japan. species are the predominant aquacultured fish, accounting for more than half the total production of finfish by aquaculture. Cultured Seriola fish fill both domestic demand and an export demand, and are therefore one of the most economically important fish genera in Japan. The production of other marine finfish, including the coho salmon (Oncor- hynchus kisutch) and bastard halibut (Paralichthys olivaceus), ∗ Corresponding author. Research Center for Fish Diseases, National Research Institute of Aquaculture, Japan Fisheries Research and Education Agency, 422-1 Nakatsuhamaura, Minami -Ise, Mie, 516-0193, Japan. E-mail address: [email protected]ffrc.go.jp (T. Matsuyama). https://doi.org/10.1016/j.fsi.2019.09.031 Received 12 March 2019; Received in revised form 13 September 2019; Accepted 14 September 2019 Available online 03 October 2019 1050-4648/ © 2019 Elsevier Ltd. All rights reserved. Y. Matsuura, et al. Fish and Shellfish Immunology 95 (2019) 236–247 Fig. 1a. Comparison of the production by fisheries and aquaculture in Japan in 1993–2017. Production by fisheries and aquaculture is shown on the left axis. The ratio of aquacultural production to the total amount of national fisheries production is shown on the right axis. Production of shellfish and seaweed is also included in the statistical data. Data are based on fisheries and aquaculture production statistics from the Ministry of Agriculture, Forestry, and Fisheries of Japan (MAFF). Fig. 1b. Trends in the value of fisheries and aquaculture in Japan in 1993–2017. Values of fisheries and aquaculture are shown on the left axis. The ratio of the aquacultural value to the total value of national production is shown on the right axis. Values of shellfish and seaweed are also included in the statistical data. Data are based on fisheries and aquaculture production statistics from the MAFF. 237 Y. Matsuura, et al. Fish and Shellfish Immunology 95 (2019) 236–247 Fig. 2a. Aquacultural production of finfish in Japan in 2006–2016. Data are based on fisheries and aquaculture production statistics from the MAFF. corresponds to around 10% of the total cultured finfish production in Government has formulated a national action plan on AMR, so the Japan. The dominant freshwater species cultured is the eel (Anguilla importance of vaccines against infectious fish diseases is still growing. spp.), followed by the rainbow trout (O. mykiss) and ayu (sweetfish, Plecoglossus altivelis), which combined account for around 10% of the 2.3. Infectious diseases that cannot be controlled by vaccines total cultured finfish production. In addition to these species, various fi fi marine and freshwater n sh species are produced on a smaller scale Intracellular bacterial infections, such as nocardiosis, and edward- ff fi fi (see Fig. 1b). Data on the aquacultural production of di erent n sh siellosis, are major problems in various fish species (Table 1) because are summarized in Fig. 2. no effective vaccines are available. The pathogens are naturally elimi- nated by cell-mediated immunity, which can be enhanced by live-at- 2.2. Economic losses caused by infectious diseases tenuated vaccines but is difficult to induce with inactivated vaccines [7,8]. Unfortunately, live-attenuated vaccines are not permitted for use Before 1996, no vaccines for marine fish had been approved in in aquaculture in Japan because the attenuated pathogens can poten- Japan, and the administration of antibiotics was the major way to tially revert to a pathogenic form, risking their environmental spread. prevent outbreaks of fish diseases, although antibiotics are only effec- Therefore, the lack of effective methods for the prevention of these tive for bacterial infections and potentially stimulate the development infectious diseases is a major issue that must be resolved. of AMR. Because the strategies for disease prevention were limited, the Infection with difficult-to-culture or unculturable pathogens is also economic losses caused by infectious diseases is aquaculture exceeded difficult to control with vaccines because inactivated vaccines cannot 20 billion yen before the 21st century (equivalent to US$0.18 billion in be prepared against them. For instance, a pathogen causing bacterial 1996) (Fig. 3). In 1997, a vaccine against Lactococcus garvieae was ap- hemolytic jaundice (BHJ) in the yellowtail, Ichthyobacterium seriolicida proved for use in Seriola fish and reduced the losses caused by this [9], belongs to the novel bacterial family Ichthyobacteriaceae and is disease every year (Fig. 3). Other vaccines have also been developed, difficult to culture [10,11], so a stable supply of vaccine antigen cannot and economic losses from fish infectious diseases were reduced by 70% be ensured. Some viral pathogens of fish cannot be cultured because in the decades since 1995 (Fig. 3). In recent years, the Japanese there are no suitable cell lines. Atypical cellular gill disease, which 238 Y. Matsuura, et al. Fish and Shellfish Immunology 95 (2019) 236–247 Fig. 2b. Value of finfish production by aquaculture in Japan in 2003–2016. Data are based on fisheries and aquaculture production statistics from the MAFF. occurs in sweetfish, is a viral infection thought to be caused by an psychrophilum, the etiological agent of bacterial cold-water disease unculturable poxvirus (Plecoglossus altivelis poxvirus-like virus, PaPV) (BCWD), has caused the most serious mass mortality in the aquaculture [12], and has spread widely in Japan. The disease is the second or third of sweetfish in recent years (Table 1). BCWD is also considered to
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