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A.m. Orlov - One of the best experts on this subject based on the ideXlab platform.

  • Ichthyofauna of fresh and brackish waters of Sakhalin Island: An annotated list with taxonomic comments: 4. Pholidae–Tetraodontidae families
    Journal of Ichthyology, 2017
    Co-Authors: Yu. V. Dyldin, A.m. Orlov
    Abstract:

    The final part of the work provides the completion of the annotated taxonomic list of fish species found in freshwater and coastal brackish waters of Sakhalin Island, which includes 46 species belonging to 25 genera, nine families (Pholidae, Trichodontidae, Ammodytidae, Odontobutidae, Gobiidae, Paralichthyidae, Pleuronectidae, Monacanthidae, Tetraodontidae), and three orders (Perciformes, Pleuronectiformes, Tetraodontiformes). The comments on the ichthyofauna of fresh and brackish waters of Sakhalin are provided.

  • Feeding pattern of the great sculpin Myoxocephalus polyacanthocephalus (Cottidae) and its position in the trophic system of near-Kamchatka waters
    Journal of Ichthyology, 2013
    Co-Authors: A. M. Tokranov, A.m. Orlov
    Abstract:

    Feeding patterns of the great sculpin Myoxocephalus polyacanthocephalus in near-Kamchatka waters of the Sea of Okhotsk, the Bering Sea and Pacific Ocean are considered using materials collected during 1978–2002. This species of Cottidae is characterized by wide feeding spectra (over 150 nutritive objects); nonetheless, fishes (on average 61.1%) and Decapoda (20.0%) have the highest significance in its diet. The fishes include Alaska pollock Theragra chalcogramma (32.7% of food mass), flatfish Pleuronectidae (12.2%), and sculpins Cottidae (10.5%); Decapoda include crabs from the family Majidae (18.5%). Seasonal, local, interannual, and age-related changes in food composition of the great sculpin are considered. This species is a facultative ambuscade predator; it is characterized by wide feeding spectra that permits him to use a considerable range of food components. In the trophic system of near-Kamchatka regions, units that form the biomass of the great sculpin are selected.

  • Rare events of cyclopia and melanism among deep-water snailfishes (Liparidae, Scorpaeniformes)
    MTS IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295), 2001
    Co-Authors: A.m. Orlov
    Abstract:

    Natural anomalies of fish eyes are noted occasionally and were never previously reported for snailfishes (Liparidae). Among fishes melanism is occurred in the nature relatively rare and sometimes associated with intergeneric hybridization or pathologic invasion. Until now the cases of melanism among fishes were known only for some paddlefishes (Polyodontidae), gars (Lepidosteidae), herrings (Clupeidae), livebearers (Poeciliidae), carps (Cyprinidae), loaches (Cobitiidae), salmons (Salmonidae), cods (Gadidae), rockfishes (Scorpaenidae), and righteye flounders (Pleuronectidae). Melanistic specimens of snailfishes were never previously reported. The first records of single-eyed specimen of round snailfish, Careproctus roseofuscus, and melanistic specimens of dimdisc snailfish, Elassodiscus tremebundus, and undescribed species, Careproctus cf. cyclocephalus, are documented. Some external characters of single-eyed and melanistic specimens are given and their photographs are provided.

E. P. Voronina - One of the best experts on this subject based on the ideXlab platform.

  • Specific features of the seismosensory system and their use in the systematics of five families of the order pleuronectiformes
    Journal of Ichthyology, 2009
    Co-Authors: E. P. Voronina
    Abstract:

    The structure of the seismosensory system (SSS) was studied in 23 species of 13 genera from the families Rhombosoleidae, Poecilopsettidae, and Samaridae, and a comparison and generalization of the obtained data with those published previously for the families Psettodidae and Pleuronectidae was performed. It was shown that the individual variability of SSS does not concern topography of canals, being manifested in the variation of the number of pores in particular canals. Interspecific differences also concern mainly the number of pores, and revealing these differences requires, as a rule, statistic methods. Considerable differences were found between genera, so that each of the 40 studied genera can be characterized by a unique combination of SSS characters whose polarization was established on the basis of a reduction trend of SSS transformations common for bony fish. The maximum number of plesiomorphies of SSS was found in the genus Psettodes (Psettodidae). In the framework of the family Pleuronectidae, the most generalized structure of SSS was found in representatives of the subfamily Hippoglossinae, and the most advanced, in Pleuronectinae. In the family Rhombosoleidae, the most generalized structure of SSS is in the genus Oncopterus , the remaining representatives of the family Rhombosoleidae are characterized by a different degree of its reduction. In rather closely related families Poecilopsettidae and Samaridae, SSS is considerably reduced, which may be connected with the miniatuarization of their representatives. A small number of considered characters and a high level of homoplasia hinders their use in cladistic study; however, considerable differences between the studied genera and a low interspecific variation permits for the considering of specific features of SSS as valuable diagnostic characters of genera, and the degree of reduction of this system can indicate the relative degree of advancement of a specific taxon of Pleuronectiformes.

  • Structure of seismosensory system in Oncopterus darwinii (Rhombosoleinae, Pleuronectidae)
    Journal of Ichthyology, 2007
    Co-Authors: E. P. Voronina, H. M. Dias De Astarloa
    Abstract:

    Structure of the seismosensory system in Oncopterus darwinii is studied. Specific traits are revealed, along with the general similarity with previously investigated representatives of the order Pleuronectiformes. Presence of some plesiomorphic features characterizes the structure of the seismosensory system of O. darwinii as the generalized one.

D. J. Martell - One of the best experts on this subject based on the ideXlab platform.

  • Spatial and temporal distributions of larval sealworm (Pseudoterranova decipiens, Nematoda: Anisakinae), in Hippoglossoides platessoides (Pleuronectidae) in eastern Canada from 1980 to 1990
    Journal of Materials Science, 2000
    Co-Authors: Gary Mcclelland, R K Misra, D. J. Martell
    Abstract:

    McClelland, G., Misra, R. K., and Martell, D. J. 2000. Spatial and temporal distributions of larval sealworm (Pseudoterranova decipiens, Nematoda: Anisakinae), in Hippoglossoides platessoides (Pleuronectidae) in eastern Canada from 1980 to 1990. – ICES Journal of Marine Science, 57: 69–88. Larval sealworm (Pseudoterranova decipiens) infections were surveyed in the fillets and napes of 28 065 Canadian plaice (Hippoglossoides platessoides), 31–40 cm in length, collected throughout Atlantic Canada between February 1980 and August 1990. Samples were taken from 11 locations in a 1980–1982 survey, and from 38 to 55 locations in 1983–1984, 1985–1986, 1987–1988, and 1989–1990 surveys. Prevalence (P) and abundance (A) of P. decipiens were greatest (P=96–100%, A=12.47–22.32) in 1989–1990 samples from the central Scotian Shelf near Sable Island, while plaice from northeastern Newfoundland and the Grand Banks were seldom infected (P

Morgan S. Busby - One of the best experts on this subject based on the ideXlab platform.

  • Identification of larvae of three arctic species of Limanda (Family Pleuronectidae)
    Polar Biology, 2017
    Co-Authors: Morgan S. Busby, Deborah M. Blood, Ann C. Matarese
    Abstract:

    Identification of fish larvae in Arctic marine waters is problematic as descriptions of early-life-history stages exist for few species. Our goal in this study is to provide descriptions that enable researchers to distinguish larvae of righteye flounders (family Pleuronectidae) of the genus Limanda that are among the most abundant fishes and frequently collected pleuronectid larvae in the northern Bering, Chukchi, and Beaufort seas. Three species of Limanda are represented: L. aspera (yellowfin sole), L. proboscidea (longhead dab), and L. sakhalinensis (Sakhalin sole). Partial descriptions of L. aspera and L. proboscidea larvae have been previously published, but content and illustrations are inadequate for making positive identifications; therefore, each species is redescribed here with updated illustrations. Larvae of L. sakhalinensis are described for the first time. Descriptions of meristic, morphometric, and pigment characteristics with species comparisons of larvae are presented. Primary characters that distinguish the three species are pigmentation, body depth, and length of larvae and early juveniles at developmental stage landmarks. Pigment characters during the early and late larval stages of L. proboscidea and its large size at transformation are different compared to L. aspera and L. sakhalinensis . These disparate larval characters described for L. proboscidea in comparison to the other two species provide additional evidence suggesting the genus Limanda may be paraphyletic, as has been proposed in other studies. Results presented here have potential utility in future Arctic fisheries oceanography research.

  • Habitat associations of demersal fishes and crabs in the Pribilof Islands region of the Bering Sea
    Fisheries Research, 2005
    Co-Authors: Morgan S. Busby, Kathryn L. Mier, Richard D. Brodeur
    Abstract:

    Habitat associations of demersal fishes and crabs were determined from observations of videotapes recorded by a cameraequipped remotely operated vehicle (ROV) in the Bering Sea near the Pribilof Islands in September 1995 and 1997. We identified 42 taxa representing 16 families of fishes and 8 taxa from 3 families of crabs. Families Pleuronectidae (righteye flounders) and Cottidae (sculpins) were represented by the greatest number of taxa. Lepidopsetta polyxystra and Chionoecetes opilio were the most frequently observed fish and crab species. Other fish species in the families Pleuronectidae, Gadidae, Scorpaenidae, Agonidae, and Bathymasteridae were also encountered frequently. Six classifications based on substrate and cover were used to describe the habitat where each fish and crab was observed. Agonids and pleuronectids were typically observed on silt, mud, or sand substrate with no cover while other taxa, particularly cottids and bathymasterids, were encountered in more varieties of habitat including areas covered with rocks and boulders. Significant differences in species composition were found among habitats and stratified depth ranges. Similarity analyses showed that different taxa were responsible for these differences, but within each habitat type and depth range, two to five species contributed to 90% of the average similarity. Some ROV dives were paired with bottom trawls in the same general locations. Species compositions of the ROV observations were significantly correlated with that of the corresponding bottom trawl catch compositions. Overall, we believe that in situ observations provide useful information on fish habitats and behaviors not readily available from conventional trawling surveys. Published by Elsevier B.V.

Dawn M Roje - One of the best experts on this subject based on the ideXlab platform.

  • incorporating molecular phylogenetics with larval morphology while mitigating the effects of substitution saturation on phylogeny estimation a new hypothesis of relationships for the flatfish family Pleuronectidae percomorpha pleuronectiformes
    Molecular Phylogenetics and Evolution, 2010
    Co-Authors: Dawn M Roje
    Abstract:

    Abstract The family Pleuronectidae contains 23 genera and 60 species of primarily dextral flatfishes that maintain a broad distribution, inhabiting all oceans of the Northern Hemisphere. Adults are asymmetrical fishes that are mostly benthic; however, pre-transformation larvae are symmetrical, swimming upright in the water column. A previous phylogenetic analysis, utilizing characters of adult morphology, recovered four major lineages of Pleuronectidae. Evidence from external larval morphology, however, indicates an alternative hypothesis. To resolve intergeneric relationships, DNA sequences (totaling 2391 bp) from the nuclear recombination activating gene 2 (RAG2), and the mitochondrial genes, NADH dehydrogenase subunit 1 (ND1) and 16S, for 22 pleuronectid genera, were analyzed using Bayesian and Maximum Likelihood methods. The markers were partitioned and analyzed for substitution saturation and only the third codon position of ND1 (ND1–3) was found to have reached saturation. Two datasets, one with the saturated data and one without, were analyzed and compared to assess the effects of the saturated data on topology and clade support. Change-point analysis was carried out on saturated transitions and was used to determine the first point where the saturation curve began behaving non-linearly. The level 1 change point was then treated as a threshold pairwise genetic distance. Those clades whose members all had a pairwise distance less than this value were treated as inferred from unsaturated data. Ancestral state reconstruction, utilizing parsimony with unordered states, was carried out on the molecular phylogenies and was used to determine the distribution of character states of larval morphology within the family. The presence of postanal ventral melanophores, distal finfold pigment, preopercular and otic spines, and the pattern of melanophores in the median finfolds of larvae maintain strong phylogenetic signals in the context of these new molecular phylogenies. These findings reaffirm the usefulness of larval characters in systematic ichthyology, especially as an additional line of evidence when hypotheses of relationships based on DNA sequences and adult morphology disagree.