First detection of Hematodinium sp. In spiny king crab Paralithodes brevipes, and new geographic areas for the parasite in tanner crab Chionoecetes bairdi, and red king crab Paralithodes camtschaticus
Graphical abstract
Introduction
The dinoflagellate parasite Hematodinium Chatton et Poisson (Syndinea: Syndiniophyceae: Syndiniales: Syndiniaceae) is one of the most dangerous crab parasites and is found in many areas of the World Ocean (Meyers et al., 1990, Meyers et al., 1996, Hudson and Shields, 1994, Messick, 1994, Stentiford and Shields, 2005, Shields, 2012, Small, 2012). With the exception of two reports in the literature, they have all been found in the Northern Hemisphere. New host crustaceans and geographic locations are increasingly being reported(Meyers et al., 1987, Meyers et al., 1990, Meyers et al., 1996, Wilhelm and Mialhe, 1996, Stentiford and Shields, 2005, Ryazanova, 2008, Xu et al., 2010, Morado, 2011, Morado et al., 2012, Small, 2012, Stentiford et al., 2012, Wang et al., 2017, Ryazanova et al., 2018).
Molecular studies show that the taxonomically unidentified Hematodinium sp. infects most boreal host crustaceans (Jensen et al., 2010, Small, 2012). In the North Pacific, the presence of Hematodinium sp. in tanner crabs Chionoecetes bairdi was first discovered in 1985 (Meyers et al., 1987). It has now been shown to be widespread in this species as well as in the snow crab Chionoecetes opilio of southeast Alaska, the eastern Bering and Chukchi seas (Meyers et al., 1987, Meyers et al., 1990, Meyers et al., 1996, Morado et al., 2012).
Hematodinium sp. was first recorded in Russia in the Sea of Okhotsk in 2002 in snow crab C. opilio (Karmanova and Ryazanova, 2008) and was later found in four more species of commercial crabs: red king Paralithodes camtschaticus, blue king P. platypus, golden king Litodes aequispinus and tanner C. bairdi (Ryazanova et al., 2010, Metelev and Ryazanova, 2013, Ryazanova et al., 2016). More recently, the parasite has been reported in the non-commercial soft crab Hapalogaster grebnitzkii (Ryazanova et al., 2018). Hematodinium sp. are found in an area which covers the northern and eastern parts of the Sea of Okhotsk and the western part of the Bering and Chukchi seas. This article reports the detection of Hematodinium sp. off the Pacific coast of Kamchatka in three species of crabs: red king crab P. camtschaticus, tanner crab C. bairdi, and spiny king crab Paralithodes brevipes. This is the first detection of Hematodinium sp. in spiny king crab. This report presents macroscopic and microscopic descriptions (light and transmission electron microscopy) of the disease and molecular identification of Hematodinium sp. in crabs.
Section snippets
Materials and methods
In May 2019, during a standard trap survey off the Pacific coast of Kamchatka (Avacha and Kronotsky bays, see Fig. 1), we investigated diseases in the captured crustaceans. At depths of between 15 and 94 m, the crew set nine standard Japanese conical traps for each of the 67 stations in the study area using frozen herring as bait. Depending on weather conditions, the traps were deployed for between 18 and 24 h.
The commercial crab species inhabiting the area: tanner crab C. bairdi, snow crab C.
Results
We examined a total of 2344 specimens visually and pathological analysis was carried out on 1104 crabs (Table 2).
We found Hematodinium sp. in three species of crabs at six separate stations: spiny king crabs (2 males), red king crabs (3 males/1 female) and 2 male tanner crabs (Fig. 1). The prevalence of the infection was 0.2% for tanner crabs and 2.7% for red king crabs. We did not find Hematodinium sp. in snow crabs. Due to a limited sample size, we were unable to calculate the prevalence for
Visual and histological signs of infection
The condition of the integument of all diseased crustaceans corresponded to stage 3 of the molting cycle. The colour of the carapace of the infected tanner crabs was pink on the dorsal and chalk on the ventral side. We didn’t observe any changes in the colour of the shell of the spiny and red king crabs. Upon necropsy, the same visual signs of the disease appeared in all three species. Their hemolymph was opaque and the colour was creamy or light yellow, unlike healthy hemolymph, which is
Ultrastructure of Hematodinium sp
In the spiny king crab, the polymorphic amoeboid trophonts had a nucleus with small condensed chromosomes surrounded by a thin nuclear envelope, not always detectable by electron microscopy. The nucleus was divided with the formation of a constriction without destruction of the nuclear membrane, which is characteristic of dinomitosis (Fig. 3A).
The cytotomy process was not synchronized with karyokinesis, causing formation of binucleate and multinucleate cells. The size of the uninucleate
Genetic analysis
We used all the primer combinations recommended by Jensen (Jensen et al, 2010) to obtain 18S rRNA - ITS1 Hematodinium fragments from three crab species. All combinations of the forward primer with the Hsp2R primer (Hudson and Adlard,1996) lead to either unreadable sequence or to a fragment of the ribosomal gene of the host DNA. In addition, in parasites from red king and spiny king crabs, the results were unsatisfactory when sequencing the ITS1 region of various amplified fragments
Discussion
The results of genetic analysis showed that the pathogen we found in the spiny king crab, as well as in the red king and tanner crab from Avacha and Kronotsky bays of the Pacific coast of Kamchatka is Hematodinium sp. and it is the same or close to that which was previously isolated in the red king and blue crabs, as well as the soft crab from the Sea of Okhotsk (Ryazanova et al., 2010, Ryazanova et al., 2018), as well as in crabs of the genus Chionoecetes and the genus Lithodes (Jensen et
Declaration of Competing Interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Acknowledgments
We would like to recognize our colleagues for their collaboration on this project and offer our sincere gratitude to the crew of the research vessel Engineer Martynov for their dedication and courage shown in performing their duties on this voyage. We are deeply grateful to the reviewers for their valuable comments, which made it possible to significantly improve the original version of this article. The material for ultrastructural investigation was processed and analyzed at the Far Eastern
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