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Functional Groups of Metazoan Parasites of the Dusky Flounder (Syacium papillosum) as Bioindicators of Environmental Health of the Yucatan Shelf.

Bull Environ Contam Toxicol 2021 Apr 3. Epub 2021 Apr 3.

Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN) Unidad Mérida, Carretera antigua a Progreso Km. 6, 97310, Mérida, Yucatán, Mexico.

We aimed to compare the percentage of explained variance given by the relationship of species and functional groups of metazoan parasites of the dusky flounder Syacium papillosum and environmental variables from water and sediments in the Yucatan shelf (YS). Parasite data were obtained from 127 S. papillosum specimens collected from 17 of 67 stations. Read More

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Systematic revision of the flatfish genus Peltorhamphus Günther, 1862 (Teleostei: Pleuronectiformes: Rhombosoleidae), including description of a new species from Southeastern New Zealand, with biological and ecological summaries for the species.

Authors:
Thomas A Munroe

Zootaxa 2021 Jan 12;4905(1):zootaxa.4905.1.1. Epub 2021 Jan 12.

National Systematics Laboratory, NOAA/NMFS/OST, Smithsonian Institution, Post Office Box 37012, NHB, WC 57, MRC-153, Washington, DC 20013-7012,USA..

The flatfish genus Peltorhamphus Günther, 1862 (Pleuronectiformes: Rhombosoleidae) and its constituent species are redescribed based on examination of 1885 specimens. Four species are considered valid: three previously described (P. novaezeelandiae Günther, 1862, P. Read More

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January 2021

Reconciling seascape genetics and fisheries science in three codistributed flatfishes.

Evol Appl 2021 Feb 2;14(2):536-552. Epub 2020 Nov 2.

Laboratory of Biodiversity and Evolutionary Genomics KU Leuven Leuven Belgium.

Uncertainty hampers innovative mixed-fisheries management by the scales at which connectivity dynamics are relevant to management objectives. The spatial scale of sustainable stock management is species-specific and depends on ecology, life history and population connectivity. One valuable approach to understand these spatial scales is to determine to what extent population genetic structure correlates with the oceanographic environment. Read More

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February 2021

Chromosome level reference of Atlantic halibut Hippoglossus hippoglossus provides insight into the evolution of sexual determination systems.

Mol Ecol Resour 2021 Mar 2. Epub 2021 Mar 2.

Biology Department, Dalhousie University, Halifax, NS, Canada.

Changes in the genetic mechanisms that control sexual determination have occurred independently across the tree of life, and with exceptional frequency in teleost fishes. To investigate the genomic changes underlying the evolution of sexual determination, we sequenced a chromosome-level genome, multitissue transcriptomes, and reduced representation population data for the Atlantic halibut (Hippoglossus hippoglossus), which has an XY/XX sex determination mechanism and has recently diverged (0.9-3. Read More

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Immunogene expression analysis in betanodavirus infected-Senegalese sole using an OpenArray® platform.

Gene 2021 Mar 11;774:145430. Epub 2021 Jan 11.

Universidad de Málaga, Instituto de Biotecnología y Desarrollo Azul, IBYDA, Departamento de Microbiología, Facultad de Ciencias, Málaga, Spain. Electronic address:

The transcriptomic response of Senegalese sole (Solea senegalensis) triggered by two betanodaviruses with different virulence to that fish species has been assessed using an OpenArray® platform based on TaqMan™ quantitative PCR. The transcription of 112 genes per sample has been evaluated at two sampling times in two organs (head kidney and eye/brain-pooled samples). Those genes were involved in several roles or pathways, such as viral recognition, regulation of type I (IFN-1)-dependent immune responses, JAK-STAT cascade, interferon stimulated genes, protein ubiquitination, virus responsive genes, complement system, inflammatory response, other immune system effectors, regulation of T-cell proliferation, and proteolysis and apoptosis. Read More

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A new species of Neoheterobothrium Price, 1943 (Monogenea, Diclidophoridae) from Syacium papillosum (Linnaeus) (Pleuronectiformes, Paralichthyidae) in the Yucatan Shelf, with notes on the validity of the subfamilies in the Diclidophoridae.

Parasitol Res 2021 Mar 10;120(3):887-897. Epub 2021 Jan 10.

Laboratorio de Parasitología Acuática, Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV-IPN) Unidad Mérida, Carretera Antigua a Progreso Km. 6, Cordemex, C.P. 97310, Mérida, Yucatán, México.

Neoheterobothrium papillosum n. sp. (Monogenea: Diclidophoridae) is described based on specimens collected from the gills of the dusky flounder Syacium papillosum (Linnaeus) (Paralichthyidae) in the Yucatan Shelf. Read More

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Variations in the conserved 18S and 5.8S reveal the putative pseudogenes in 18S-ITS1-5.8S rDNA of Cynoglossus melampetalus (Pleuronectiformes: Cynoglossidae).

Biochem Biophys Res Commun 2021 01 1;534:233-239. Epub 2020 Dec 1.

Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, China.

Many early studies of ribosomal RNA gene (rDNA) suggested that rDNA tandem repeats within species are homogeneous. However, increasing number of reports have found intra-individual rDNA polymorphism across a range of taxa. Here, we reported a high level of intra-individual polymorphism of 18S-ITS1-5. Read More

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January 2021

Kisspeptin Influences the Reproductive Axis and Circulating Levels of microRNAs in Senegalese Sole.

Int J Mol Sci 2020 Nov 28;21(23). Epub 2020 Nov 28.

Center of Marine Sciences-CCMAR, University of Algarve, 8005-139 Faro, Portugal.

Kisspeptin regulates puberty and reproduction onset, acting upstream of the brain-pituitary-gonad (HPG) axis. This study aimed to test a kisspeptin-based hormonal therapy on cultured Senegalese sole (G1) breeders, known to have reproductive dysfunctions. A single intramuscular injection of KISS2-10 decapeptide (250 µg/kg) was tested in females and males during the reproductive season, and gonad maturation, sperm motility, plasma levels of gonadotropins (Fsh and Lh) and sex steroids (11-ketotestosterone, testosterone and estradiol), as well as changes in small non-coding RNAs (sncRNAs) in plasma, were investigated. Read More

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November 2020

An improved de novo assembling and polishing of Solea senegalensis transcriptome shed light on retinoic acid signalling in larvae.

Sci Rep 2020 11 26;10(1):20654. Epub 2020 Nov 26.

Department of Molecular Biology and Biochemistry, Universidad de Málaga, Málaga, 29071, Spain.

Senegalese sole is an economically important flatfish species in aquaculture and an attractive model to decipher the molecular mechanisms governing the severe transformations occurring during metamorphosis, where retinoic acid seems to play a key role in tissue remodeling. In this study, a robust sole transcriptome was envisaged by reducing the number of assembled libraries (27 out of 111 available), fine-tuning a new automated and reproducible set of workflows for de novo assembling based on several assemblers, and removing low confidence transcripts after mapping onto a sole female genome draft. From a total of 96 resulting assemblies, two "raw" transcriptomes, one containing only Illumina reads and another with Illumina and GS-FLX reads, were selected to provide SOLSEv5. Read More

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November 2020

Complementarity and discriminatory power of genotype and otolith shape in describing the fine-scale population structure of an exploited fish, the common sole of the Eastern English Channel.

PLoS One 2020 5;15(11):e0241429. Epub 2020 Nov 5.

ESE, Ecologie et Santé des Ecosystèmes, Institut Agro - Agrocampus Ouest, INRAE, Rennes, France.

Marine organisms show population structure at a relatively fine spatial scale, even in open habitats. The tools commonly used to assess subtle patterns of connectivity have diverse levels of resolution and can complement each other to inform on population structure. We assessed and compared the discriminatory power of genetic markers and otolith shape to reveal the population structure on evolutionary and ecological time scales of the common sole (Solea solea), living in the Eastern English Channel (EEC) stock off France and the UK. Read More

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December 2020

RNA-seq transcriptome analysis in flounder cells to compare innate immune responses to low- and high-virulence viral hemorrhagic septicemia virus.

Arch Virol 2021 Jan 3;166(1):191-206. Epub 2020 Nov 3.

Department of Biological Sciences, University of Ulsan, Ulsan, 44610, Korea.

Viral hemorrhagic septicemia virus (VHSV) is a rhabdovirus that causes high mortality in cultured flounder. Viral growth and virulence rely on the ability to inhibit the cellular innate immune response. In this study, we investigated differences in the modulation of innate immune responses of HINAE flounder cells infected with low- and high-virulence VHSV strains at a multiplicity of infection of 1 for 12 h and 24 h and performed RNA sequencing (RNA-seq)-based transcriptome analysis. Read More

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January 2021

A Machine Learning Approach in Analyzing Bioaccumulation of Heavy Metals in Turbot Tissues.

Molecules 2020 Oct 14;25(20). Epub 2020 Oct 14.

Department of Foood Science, Food Engineering, Biotechnology and Aquaculture, Faculty of Food Science and Engineering, University "Dunărea de Jos" of Galați, 800008 Galați, Romania.

Metals are considered to be one of the most hazardous substances due to their potential for accumulation, magnification, persistence, and wide distribution in water, sediments, and aquatic organisms. Demersal fish species, such as turbot (), are accepted by the scientific communities as suitable bioindicators of heavy metal pollution in the aquatic environment. The present study uses a machine learning approach, which is based on multiple linear and non-linear models, in order to effectively estimate the concentrations of heavy metals in both turbot muscle and liver tissues. Read More

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October 2020

 New replacement name for a homonym in Lepeophtheirus (Crustacea: Copepoda: Caligidae).

Zootaxa 2020 Sep 14;4852(1):zootaxa.4852.1.9. Epub 2020 Sep 14.

Faculty of Science, Hokkaido University, N10 W8 Kita-ku, Sapporo 060-0810, Japan.

Markevich (1940) established Pseudolepeophtheirus Markevich, 1940 for Pseudolepeophtheirus longicauda Markevich, 1940 based on copepods collected from the pleuronectid fish Platichthys stellatus (Pallas, 1787). Dojiri Ho (2013) synonymized the genus and the species with Lepeophtheirus Nordmann, 1832 and Lepeophtheirus parvicruris Fraser, 1920, respectively. Later, Homma et al. Read More

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September 2020

Evaluating socio-economic and conservation impacts of management: A case study of time-area closures on Georges Bank.

PLoS One 2020 13;15(10):e0240322. Epub 2020 Oct 13.

eOceans, Dartmouth, Nova Scotia, Canada.

Globally, economies and marine ecosystems are increasingly dependent on sustainable fisheries management (SFM) to balance social, economic, and conservation needs. The overarching objectives of SFM are to maximize both conservation and socio-economic benefits, while minimizing short-term socio-economic costs. A number of tools have been developed to achieve SFM objectives, ranging from fishery specific to ecosystem-based strategies. Read More

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December 2020

Transcriptome analysis based on RNA-seq of common innate immune responses of flounder cells to IHNV, VHSV, and HIRRV.

PLoS One 2020 28;15(9):e0239925. Epub 2020 Sep 28.

Department of Biological Sciences, University of Ulsan, Ulsan, Korea.

Viral hemorrhagic septicemia virus (VHSV) and hirame rhabdovirus (HIRRV) belong to the genus Novirhabdovirus and are the causative agents of a serious disease in cultured flounder. However, infectious hematopoietic necrosis virus (IHNV), a prototype of the genus Novirhabdovirus, does not cause disease in flounder. To determine whether IHNV growth is restricted in flounder cells, we compared the growth of IHNV with that of VHSV and HIRRV in hirame natural embryo (HINAE) cells infected with novirhabdoviruses at 1 multiplicity of infection. Read More

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November 2020

Novel Gene Rearrangement and the Complete Mitochondrial Genome of : Insights into the Envolution of the Family Cynoglossidae (Pleuronectiformes).

Int J Mol Sci 2020 Sep 20;21(18). Epub 2020 Sep 20.

College of Marine Sciences, South China Agriculture University, Guangzhou 510642, China.

, a small benthic fish, belongs to the Cynoglossidae, Pleuronectiformes. It was rarely studied due to its low abundance and cryptical lifestyle. In order to understand the mitochondrial genome and the phylogeny in Cynoglossidae, the complete mitogenome of has been sequenced and analyzed for the first time. Read More

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September 2020

Prediction of genomic breeding values based on pre-selected SNPs using ssGBLUP, WssGBLUP and BayesB for Edwardsiellosis resistance in Japanese flounder.

Genet Sel Evol 2020 Aug 18;52(1):49. Epub 2020 Aug 18.

Wuxi Fisheries College, Nanjing Agricultural University, Wuxi, 214081, China.

Background: Edwardsiella tarda causes acute symptoms with ascites in Japanese flounder (Paralichthys olivaceus) and is a major problem for China's aquaculture sector. Genomic selection (GS) has been widely adopted in breeding industries because it shortens generation intervals and results in the selection of individuals that have great breeding potential with high accuracy. Based on an artificial challenge test and re-sequenced data of 1099 flounders, the aims of this study were to estimate the genetic parameters of resistance to E. Read More

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Characterization of a novel live attenuated Edwardsiella piscicida vaccine based on the overexpressed type III secretion system and systematic deletion of the associated effectors.

Fish Shellfish Immunol 2020 Nov 4;106:536-545. Epub 2020 Aug 4.

State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China; Shanghai Engineering Research Center of Maricultured Animal Vaccines, Shanghai, 200237, China; Shanghai Collaborative Innovation Center for Biomanufacturing, 130 Meilong Road, Shanghai, 200237, China. Electronic address:

Edwardsiella piscicida causes edwardsiellosis in a variety of fish species and leads to tremendous economic losses in the global aquaculture industries. Thus, effective and safe prevention and control of this bacterium are urgently needed to combat the related infections. Live attenuated vaccines (LAVs) effectively prevent infectious diseases. Read More

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November 2020

Pathogenic characterization of Aeromonas salmonicida subsp. masoucida turbot isolate from China.

J Fish Dis 2020 Oct 27;43(10):1145-1154. Epub 2020 Jul 27.

State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.

Aeromonas salmonicida is a gram-negative bacterium that is the causative agent of furunculosis. An A. salmonicida strain was isolated from diseased turbot (Scophthalmus maximus) with the sign of furunculosis from North China. Read More

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October 2020

Effect of water temperature on the protective efficacy of single-cycle rVHSV-GΔTM vaccine in olive flounder (Paralichthys olivaceus).

Fish Shellfish Immunol 2020 Oct 21;105:270-273. Epub 2020 Jul 21.

Department of Aquatic Life Medicine, Pukyong National University, Busan, 48513, South Korea. Electronic address:

Water temperature is an important factor for immune responses in poikilothermic fish. Especially, it has been known that adaptive immunity is more sensitive to temperature than innate immunity in fish. The optimal temperature for olive flounder (Paralichthys olivaceus) culture is known between 20 and 25 °C, and there are several papers reporting the low or no effectiveness of inactivated vaccines in olive flounder kept at low water temperatures. Read More

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October 2020

Two short antimicrobial peptides derived from prosaposin-like proteins in the starry flounder (Platichthys stellatus).

Fish Shellfish Immunol 2020 Oct 30;105:95-103. Epub 2020 Jun 30.

Institute of Marine Industry, College of Marine Science, Gyeongsang National University, 455, Tongyeong, 650-160, Republic of Korea. Electronic address:

Prosaposin (PSAP) is a precursor of saposin (SAP), which is present in lysosomal and secreted proteins. PSAP is a member of the SAP-like protein families, which comprise multifunctional proteins. In particular, their antimicrobial activity has been reported. Read More

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October 2020

Micro-Transcriptome Analysis Reveals Immune-Related MicroRNA Regulatory Networks of Induced by Infection.

Authors:
Xianhui Ning Li Sun

Int J Mol Sci 2020 Jun 15;21(12). Epub 2020 Jun 15.

CAS Key Laboratory of Experimental Marine Biology, Center for Ocean Mega-Science, Chinese Academy of Sciences, Institute of Oceanology, Qingdao 266071, China.

MicroRNAs (miRNAs) are non-coding regulatory RNAs that play a vital part in the host immune response to pathogen infection. Japanese flounder () is an important aquaculture fish species that has suffered from bacterial diseases, including that caused by infection. In a previous study, we examined the messenger RNA (mRNA) expression profiles of flounder during infection and identified 26 hub genes in the flounder immune response. Read More

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New data on life cycles for three species of Fellodistomidae (Digenea) in the White Sea.

J Helminthol 2020 Jun 1;94:e158. Epub 2020 Jun 1.

Department of Invertebrate Zoology, Saint Petersburg University, Universitetskaya nab. 7-9, Saint Petersburg199034, Russia.

Few digeneans of the family Fellodistomidae are known from the Russian Arctic seas. The taxonomic status of these species, their life cycles and host range raised recurrent questions, some of which remain unanswered. To revise the species composition and life cycles of fellodistomids in the White Sea, we searched for them in several known and suspected hosts: wolffish, flatfishes (definitive), gastropods of the family Buccinidae (second intermediate) and protobranch bivalves (first intermediate). Read More

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A macroscopic and stereological imaging dataset of Pleuronectes platessa ovaries.

Sci Data 2020 05 29;7(1):165. Epub 2020 May 29.

Institut Français de Recherche pour l'Exploitation de la Mer, IFREMER, Laboratoire Ressources Halieutiques de Port-en-Bessin, 14520, Port-en-Bessin-Huppain, France.

The North Sea plaice, Pleuronectes platessa (Linnaeus, 1758), is a commonly studied commercial flatfish with poorly known ovarian histology. The following dataset is a collection of female plaice gonad images and their corresponding histological slides, collected during a complete season of the plaice's reproduction cycle. Stereology was used to determine the percentage of different structures found throughout the ovaries. Read More

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New Insights on Vitamin K Metabolism in Senegalese sole () Based on Ontogenetic and Tissue-Specific Vitamin K Epoxide Reductase Molecular Data.

Int J Mol Sci 2020 May 15;21(10). Epub 2020 May 15.

Center for Aquaculture Research, Agrarian Technological Institute of Castile and Leon, Ctra. Arévalo, S/n. Zamarramala, 40196 Segovia, Spain.

Vitamin K (VK) is a key nutrient for several biological processes (e.g., blood clotting and bone metabolism). Read More

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Integrative taxonomy of Pseudolepeophtheirus longicauda (Crustacea: Copepoda: Caligidae) parasitic on Platichthys stellatus (Actinopterygii: Pleuronectidae).

Parasitol Int 2020 Oct 13;78:102135. Epub 2020 May 13.

Department of Biological Sciences, Faculty of Science, Hokkaido University, N10 W8 Kita-ku, Sapporo 060-0810, Japan. Electronic address:

Based on specimens from the gill cavities of one Platichthys stellatus individual collected in the Sea of Japan, we investigated the taxonomic status of the enigmatic caligid genus Pseudolepeophtheirus and its type species, Pseudolepeophtheirus longicauda. In a maximum likelihood (ML) tree based on 18S rRNA gene sequences, the sequence from our sample was nested in a well-supported Lepeophtheirus clade, along with the type species, confirming that Pseudolepeophtheirus should be considered a junior synonym of Lepeophtheirus; our morphological data support this synonymy. Although a previous study had synonymized Pseudolepeophtheirus longicauda with Lepeophtheirus parvicruris, we found that the former differs morphologically from the latter in having a short leg-4 exopod, with the articulation between the first and second segments not evident (the shape of the posterior striated membrane on the leg-2 intercoxal sclerite also differs between two species), and detected slight differences in 18S rRNA sequences between two taxa. Read More

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October 2020

Changes in the Microbiome of Mariculture Feed Organisms after Treatment with a Potentially Probiotic Strain of Phaeobacter inhibens.

Appl Environ Microbiol 2020 07 2;86(14). Epub 2020 Jul 2.

Department of Biotechnology and Biomedicine, Technical University of Denmark, Kongens Lyngby, Denmark

The genus has been explored as probiotics in mariculture as a sustainable strategy for the prevention of bacterial infections. Its antagonistic effect against common fish pathogens is predominantly due to the production of the antibacterial compound tropodithietic acid (TDA), and TDA-producing strains have repeatedly been isolated from mariculture environments. Despite many trials targeting pathogens, little is known about its impact on host-associated microbiomes in mariculture. Read More

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Comparative transcriptomic analysis reveals mechanisms of divergence in osmotic regulation of the turbot Scophthalmus maximus.

Fish Physiol Biochem 2020 Aug 7;46(4):1519-1536. Epub 2020 May 7.

Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences; Shandong Key Laboratory of Marine Fisheries Biotechnology and Genetic Breeding, Qingdao Key Laboratory for Marine Fish Breeding and Biotechnology, Qingdao, 266071, China.

The turbot Scophthalmus maximus has evolved extensive physiological ability to adapt to multiple environmental salinities. The morphological changes of the kidney indicated the adaptability difference and similarity of turbot to salinity stress. Identify transcriptome-wide differences between low-salinity seawater (LSW, salinity 5)- and high-salinity seawater (HSW, salinity 50)-acclimated kidneys of turbot to decipher the osmotic regulation mechanism. Read More

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Inclusion of dietary Ulva ohnoi 5% modulates Solea senegalensis immune response during Photobacterium damselae subsp. piscicida infection.

Fish Shellfish Immunol 2020 May 5;100:186-197. Epub 2020 Mar 5.

Departamento de Microbiología, Universidad de Málaga, Andalucia Tech, Campus de Teatinos s/n, 29071, Málaga, Spain. Electronic address:

Macroalgae represent valuable sources of functional ingredients for fish diets, and the influence of supplemented aquafeeds on growth performance has been studied for some fish and seaweed species. In the present work, the potential immunomodulation exerted by U. ohnoi (5%) as dietary ingredient was investigated in Senegalese sole. Read More

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Effects of dietary raw or Enterococcus faecium fermented soybean meal on growth, antioxidant status, intestinal microbiota, morphology, and inflammatory responses in turbot (Scophthalmus maximus L.).

Fish Shellfish Immunol 2020 May 3;100:261-271. Epub 2020 Mar 3.

Key Laboratory of Aquaculture Nutrition and Feed, Ministry of Agriculture, Ocean University of China, Qingdao, 266003, PR China; Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, Qingdao, 266003, China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China. Electronic address:

Fermentation has been reported to improve the utilization of plant ingredients including soybean meal (SBM) by fish, but the detailed mechanism is still poorly understood. This study compared the effects of partial replacement of fish meal (FM) protein with SBM or Enterococcus faecium fermented SBM (EFSM) on the growth, antioxidant status, intestinal microbiota, morphology, and inflammatory responses in turbot (Scophthalmus maximus L.). Read More

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