Seasonal Occurrence of Helminths in the Anadromous Fish Coilia nasus (Engraulidae): Parasite Indicators of Fish Migratory Movements

Li, Wen X.; Song, Rui; Wu, Shan; Zou, Hong; Nie, Pin; Wang, Gui T.

doi:10.1645/ge-2621.1

Cited by 22 publications

(19 citation statements)

References 23 publications

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“…Before commencing migration, the anchovy consumed a large amount of food (Zhuang et al, 2006). The fish reached the Yangtze Estuary had consumed a large amount of small fish and shrimp on the coast, thereby leading to the increase in the number of helminth individuals (Li et al, 2011). Therefore, the feeding habit was responsible for the highest mean species richness and individuals of helminth communities in the Yangtze Estuary.…”

Section: Discussionmentioning

confidence: 99%

“…larvae with high salinity tolerance survived for more than half a year in freshwater, some survived less than 3 mo (Mö ller, 1978). In a previous study, the prevalence and mean abundance of marine parasites in the anadromous fish C. nasus decreased when spawning was completed in freshwater and returned to the Yangtze Estuary (Li et al, 2011). These results suggested that species richness and abundance of the marine parasites in C. nasus would decrease with the increasing migration distance when the fish migrated from the coast to the low and middle reaches of the Yangtze River.…”

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confidence: 86%

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Richness and Diversity of Helminth Communities In the Japanese Grenadier Anchovy, Coilia nasus, During Its Anadromous Migration In the Yangtze River, China

Zou

et al. 2012

Journal of Parasitology

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To determine the relationship between the species richness, diversity of helminth communities, and migration distance during upward migration from coast to freshwater, helminth communities in the anadromous fish Coilia nasus were investigated along the coast of the East China Sea, the Yangtze Estuary, and 3 localities on the Yangtze River. Six helminth species were found in 224 C. nasus. Changes in salinity usually reduced the survival time of parasites, and thus the number of helminth species and their abundance. Except for the 2 dominant helminths, the acanthocephalan Acanthosentis cheni and the nematode Contracaecum sp., mean abundance of other 4 species of helminths was rather low (,1.0) during the upward migration in the Yangtze River. Mean abundance of the 2 dominant helminths peaked in the Yangtze Estuary and showed no obvious decrease among the 3 localities on the Yangtze River. Mean species richness, Brillouin's index, and Shannon index were also highest in the estuary (1.93 ± 0.88, 0.28 ± 0.25, and 0.37 ± 0.34, respectively) and did not exhibit marked decline at the 3 localities on the Yangtze River. A significant negative correlation was not seen between the similarity and the geographical distance (R 5 20.5104, P 5 0.1317). The strong salinity tolerance of intestinal helminths, relatively brief stay in the Yangtze River, and large amount of feeding on small fish and shrimp when commencing spawning migration perhaps were responsible for the results.The anadromous Japanese grenadier anchovy, Coilia nasus (Temminck & Schlegel, 1846), is distributed in the northwestern Pacific. The fish usually feeds and overwinters in the coastal waters and spawns in freshwater. When the anchovy population distributed in coasts of the East China Sea commences migration, the fish can be first found in the Yangtze Estuary in February and the middle reaches of the Yangtze River in April (Yuan et al., 1980;Yuan, 1987;Li et al., 2007). The anchovy returns to the coasts when spawning is completed from April to October in the same year in the Yangtze River (Yuan et al., 1980;Yuan, 1987;Li et al., 2007).With adaptation of fish to a decline of salinity, parasites in the fish also need to cope with changes in the osmotic pressure. A long stay would reduce survival of the freshwater parasites in salt water or marine parasites in freshwater. The mean intensity of 1 freshwater ectoparasite and 2 endoparasites in Oncorhynchus nerka decreased when reared in seawater for 32-40 wk (Bailey et al., 1989). Survival time of the nematode larva Anguillicoloides crassus in intermediate and paratenic hosts was maximal in freshwater and declined with an increase in salinity (Kirk et al., 2000). Populations of the freshwater monogenean Gyrodactylus salaris in Atlantic salmon Salmo salar declined and became extinct when salinity increased from 7.5% to 33.0% after a few minutes (Soleng and Bakke, 1997). Although some Anisakis spp. larvae with high salinity tolerance survived for more than half a year in freshwater, some survived less than...

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Section: Discussionmentioning

confidence: 99%

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confidence: 86%

Richness and Diversity of Helminth Communities In the Japanese Grenadier Anchovy, Coilia nasus, During Its Anadromous Migration In the Yangtze River, China

Zou

et al. 2012

Journal of Parasitology

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“…Acanthosentis cheni, a marine or brackish acanthocephalan (Li et al, 2011), was found in 3 ecotypes of C. nasus during an investigation of helminths in the fish host (W. X. Li, unpubl.…”

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“…Acanthocephalans have a life span of about 1 yr. The acanthocephalan Acanthosentis tilapiae, which probably uses cyclopoid copepods as an intermediate host, appears to be recruited in summer, develops and matures through the winter, and reproduces sexually in late winter and spring (Amin et al, 2008;Li et al, 2011). Generally, acanthocephalan eggs float freely in the water until they are accidentally ingested by a suitable intermediate host (Cyclops spp.).…”

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Population Genetic Structure of the AcanthocephalanAcanthosentis cheniin Anadromous, Freshwater, and Landlocked Stocks of Its Fish Host,Coilia nasus

Song

et al. 2014

Journal of Parasitology

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The acanthocephalan Acanthosentis cheni was found in anadromous, freshwater, and landlocked stocks of its fish host, Coilia nasus. To examine the genetic variations of the acanthocephalan among the 3 populations with the adaptation of the host to the freshwater, the genetic structure of the helminth was investigated in anadromous (Zhoushan and Chongming islands, and Anqing), freshwater (Anqing, Ezhou, and Poyang Lake), and landlocked (Tian'ezhou Reserve) populations by sequencing intergenic transcribed spacers (ITS) of the ribosomal RNA coding genes. Low Fst values and high gene flow were found among the 7 populations (Fst = 0.0135, P = 0.2723; Nm = 36.48) and the 3 ecotypes of Acanthosentis cheni (Fst = 0.0178, P = 0.1044; Nm = 27.67). On the other hand, significant genetic differentiation of the C. nasus host populations was detected between the upstream and downstream areas of Xiaogu Mountain (Fst = 0.1961, P = 0.0030; Nm = 2.05), which is the farthest location of spawning migration for C. nasus . However, the migration break of the fish host appeared not to cause significant genetic differentiation of A. cheni populations between the upper and lower reaches of Xiaogu Mountain. Other factors might promote genetic exchange of A. cheni populations such as dispersal of the intermediate host by flooding or other fish species serving as the definitive or paratenic hosts. In Anqing, nucleotide diversity of the acanthocephalan was highest in the freshwater population (0.0038) and lower in the anadromous population (0.0026). This suggested that new mutations may have occurred in the freshwater A. cheni population in Anqing when adapting to a freshwater environment.

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“…It is famous for its importance as an anadromous fishery resource, nutritive value, and delicacy. C. nasus is also called the Japanese grenadier anchovy and is widely distributed in the Yellow Sea, East Sea, and Ariake Bay (Li et al, 2010;Jiang et al, 2012;Liu et al, 2014). As an anadromous species, it swims several kilometers up rivers, spawns in fresh water, and then the spherical eggs float down and hatch near the river mouth (Li et al, 2010;Liu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Screening potential SSR markers of the anadromous fish Coilia nasus by de novo transcriptome analysis using Illumina sequencing

Fang¹,

Zhou²,

Duan³

et al. 2015

Genet. Mol. Res.

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ABSTRACT. RNA-Seq technology has been widely applied to transcriptomics, genomics, molecular marker development, and functional gene studies. In the genome, microsatellites are simple sequence repeats (SSR) with a high degree of polymorphism that are used as DNA markers in many molecular genetic studies. Using traditional methods such as magnetic bead enrichment, only a few microsatellite markers have been isolated. Coilia nasus is an anadromous, small-to-moderately sized fish species that is famous as an important fishery resource. Here, we have identified a large number of microsatellites from the fish brains by using Illumina sequencing. About 20 million Illumina reads were assembled into 148,845 unigenes. A total of 13,038 SSR motifs were identified via analysis of 3,958,293,117 (3.96 Gb) nucleotides to produce a comprehensive transcript dataset for the C. nasus brain, including mono-, di-, tri-, tetra-, and penta-repeat motifs. The most abundant type of repeat motif was di-nucleotide (42.97%), followed by mono-nucleotide (38.86%), tri-nucleotide (16.21%), tetra-nucleotide (1.83%), and penta-nucleotide (0.05%) repeat units, which is similar to the results obtained in studies in other species. These data provide a base of sequence informa tion to improve molecular-assisted markers to study C. nasus genetic diversity.

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Seasonal Occurrence of Helminths in the Anadromous Fish Coilia nasus (Engraulidae): Parasite Indicators of Fish Migratory Movements

Cited by 22 publications

References 23 publications

Richness and Diversity of Helminth Communities In the Japanese Grenadier Anchovy, Coilia nasus, During Its Anadromous Migration In the Yangtze River, China

Richness and Diversity of Helminth Communities In the Japanese Grenadier Anchovy, Coilia nasus, During Its Anadromous Migration In the Yangtze River, China

Population Genetic Structure of the AcanthocephalanAcanthosentis cheniin Anadromous, Freshwater, and Landlocked Stocks of Its Fish Host,Coilia nasus

Screening potential SSR markers of the anadromous fish Coilia nasus by de novo transcriptome analysis using Illumina sequencing

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