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Eric J Hilton – One of the best experts on this subject based on the ideXlab platform.

  • development of the muscles associated with the mandibular and hyoid arches in the siberian sturgeon acipenser baerii acipenseriformes Acipenseridae
    Journal of Morphology, 2018
    Co-Authors: Peter Warth, Eric J Hilton, Benjamin Naumann, Lennart Olsson, Peter Konstantinidis
    Abstract:

    : The skeleton of the jaws and neurocranium of sturgeons (Acipenseridae) are connected only through the hyoid arch. This arrangement allows considerable protrusion and retraction of the jaws and is highly specialized among ray-finned fishes (Actinopterygii). To better understand the unique morphology and the evolution of the jaw apparatus in Acipenseridae, we investigated the development of the muscles of the mandibular and hyoid arches of the Siberian sturgeon, Acipenser baerii. We used a combination of antibody staining and formalin-induced fluorescence of tissues imaged with confocal microscopy and subsequent three-dimensional reconstruction. These data were analyzed to address the identity of previously controversial and newly discovered muscle portions. Our results indicate that the anlagen of the muscles in A. baerii develop similarly to those of other actinopterygians, although they differ by not differentiating into distinct muscles. This is exemplified by the subpartitioning of the m. adductor mandibulae as well as the massive m. protractor hyomandibulae, for which we found a previously undescribed portion in each. The importance of paedomorphosis for the evolution of Acipenseriformes has been discussed before and our results indicate that the muscles of the mandibular and the hyoid may be another example for heterochronic evolution.

  • neogene and pleistocene sturgeon acipenseriformes Acipenseridae remains from southeastern europe
    Journal of Vertebrate Paleontology, 2017
    Co-Authors: Oleksandr Kovalchuk, Eric J Hilton
    Abstract:

    Citation for this article: Kovalchuk, O. M., and E. J. Hilton. 2017. Neogene and Pleistocene sturgeon (Acipenseriformes, Acipenseridae) remains from southeastern Europe. Journal of Vertebrate Paleontology. DOI: 10.1080/02724634.2017.1362644.

  • The skull of the Chinese sturgeon, Acipenser sinensis (Acipenseridae)
    Acta Zoologica, 2015
    Co-Authors: Eric J Hilton, Casey B. Dillman, Tao Zhang, Longzhen Zhang, Ping Zhuang
    Abstract:

    The Chinese sturgeon, Acipenser sinensis, is a large member of Acipenseridae now found only in the Yangtze River and the Yellow and East China seas. The goal of this paper was to describe the skull of A. sinensis in the context of recent anatomical and systematic studies of sturgeons. Five specimens (354–670 mm standard length) were prepared as skeletons. The left and right parietals and frontals are broadly separated by a median fontanelle. The lateral-most lateral extrascapular variably supports the confluence of the supratemporal, occipital and trunk lateral lines. There is no distinct ventral supraorbital process as found in other sturgeons. The anterodorsal portion of the snout is unique among Acipenseridae by having a single large anamestic dorsal rostral bone instead of a series of separate dorsal rostral bones. There are 0–2 lateral rostral bones on each side positioned anterior to but not in contact with the horizontal arm of the jugal. The dorsal surface of the neurocranium lacks a pineal opening, and its anterior tip is sharply pointed in the smaller specimens examined and gently curved in larger specimens. The anteromedial arm of the palatopterygoid is broad relative to other acipenserids. These new morphological data are discussed and compared among Acipenseridae.

Matti Vornanen – One of the best experts on this subject based on the ideXlab platform.

M. Simon – One of the best experts on this subject based on the ideXlab platform.

  • Sturgeon (Acipenseridae Bonaparte, 1831). Thematic English language bibliography
    Institute of Fisheries, 2019
    Co-Authors: M. Simon
    Abstract:

    Purpose. Forming a thematic bibliographic list of English-language publications on certain issues of vital activity of sturgeon (Acipenseridae), both in natural conditions and in aquaculture. Particular attention was given to species that are not common in aquaculture of Ukraine. Methods. The complete and selective methods were applied in the process of the systematic search. The bibliographic core was made up of literary sources from electronic archives of world-renowned specialized scientific journals. In particular: Journal of Applied Ichthyology, Environmental Biology of Fishes,Conservation Biology, Lake and Reservoir Management, Estuaries,Freshwater FishFisheries, Aquaculture, North American Journal of Fisheries Management, Canadian Journal of Fisheries and Aquatic Sciences, Copeia & others. Results. A thematic list of main publications including thematic scientific collections, materials of international scientific and practical conferences, scientific articles and abstracts of dissertations was composed. It consists of 187 English-language papers. Presented publications cover the time interval for the last thirty years. The literary sources are arranged in alphabetical order by author or title, and described according to DSTU 8302:2015 “Information and documentation. Bibliographic reference. General principles and rules of composition”, with the amendments (code UKND 01.140.40), as well as in accordance with the requirements of APA style ‒ international standard of references. Practical value. The prepared list may be useful for scientists, practitioners, students, whose sphere of interests is related to issues of questions breeding sturgeon in aquaculture and conservation of populations of rare species of fish

  • Main hematological parameters of sturgeon species (Acipenseridae) (review)
    Institute of Fisheries, 2017
    Co-Authors: M. Simon
    Abstract:

    Purpose. To analyze scientific sources on the physiological, biochemical, ecological and genetic features of the main hematological paremeters and patterns of their variability in sturgeon species (Acipenseridae). To examine the fundamental aspects of lipid and protein metabolism in blood serum and the effect of biotic and abiotic factors on them. To highlight the common features of serum enzymes. Findings. A review of scientific papers revealed that although hematological parameters of sturgeons are generally similar to those of teleosts and mammals, there are a number of significant differences. In addition, many hematological parameters are characterized by species specificity, even within a family. Special attention is given to the variability of hematological parameters under the effect of factors of both internal and external environment. The paper describes the effects of sex and age, as well as the seasons of the year on the compositio of sturgeon blood. The fundamentals of the use of serum proteins in genetic and population studies are outlined. The features of the functioning of hemoglobin in sturgeon’s red blood cells are examined. The main hematological parameters involved in the formation and maturation of sexual products, and their effect on fertility are reviewed. For example, the spawners, which hadn’t put reproductive product, are characterized by a low rate of hemoglobin, increase in erythrocyte sedimentation speed and also a rise of the level of crude protein in blood and β-lipoproteid serum.The biochemical parameters (total protein and fractions, glucose, creatinine, cholesterol), the activity of some enzymes (alanine aminaminotransferase, aspartate aminotransferase, alkaline phosphosphatase, creatine kinase) in serum are examined. Practical value. The systematized data on the main hematological parameters and patterns of their variability in sturgeon species will be useful for both scientits and fish farmers. This is due to the fact that the analysis of blood as the most labile system of fish organism, not only clearly reflects the physiological state of the individual in specific conditions of existence, but is also used in genetic and population studies. Thus, the knowledge of the basic patterns of the formation of blood composition of sturgeon fish is necessary for further research in fisheries science. An array of the generalized information will be useful for the creation of replacement broodstocks, assessment of the quality of juveniles, determination of the readiness degree of broodfish for spawning, in ichthyopathological situations at fish farms, etc

  • Peculiarities of hemopoisis in sturgeons species (Acipenseridae) (a review)
    Institute of Fisheries, 2017
    Co-Authors: I. Hrytsyniak, M. Simon
    Abstract:

    Purpose. To analyze data from scientific sources of information regarding the species-specific features of the hematopoietic and histo-morphological characteristics of hematopoietic tissues and organs of sturgeons (Acipenseridae). Consider the general aspects of their structure at different stages of ontogeny. To present the general features of differentiation and proliferation of blood elements. Findings. A review of scientific papers and literature has revealed that hematopoiesis in sturgeon species of fish differs significantly from that of mammals (Mammalia), but also from other fish from cartilaginous (Chondrichthyes) and bony (Osteichthyes) classes. Moreover, sturgeon fishes are characterized by a species-specificity in the development of hemopoiesis organs on each stage of ontogenesis. The age-related changes of the developing blood cells, ranging from blast elements (erythroblasts, lymphoblasts, monoblasts, myeloblasts) to the appearance of mature (definitive) forms, are marked. The specific heterochrony is revealed in the development of sturgeon blood cells. The organs of hemopoiesis are: hemopoietic cranial or lymphoid organ, gills, spleen, heart, thymus, gastrointestinal tract (anterior part of the digestive canal, pyloric gland, middle intestine, spiral valve and liver) and kidneys (pronephros and mesonephros). Hepatic hematosis begins to be realized during the larval period of development from a massive spread near the vascular connective tissue. A little bit later in the age of 15 days of active feeding, a similar spread covers practically all area of the body. At this time in liver hepatocytes and reticular cells with developing blood corpuscle are precisely allocated. In this period, proliferation of all cellular lines: erythropoietic, lymphocytopoietic, myelocytopoietic, and also thrombocytopoiesis take place in liver. The plasmocyte differentiation occurs in cranial haematogenic organ of sturgeon. In reticular tissue of lymphoid organ, thrombocyte precursors — megakariocytes were found. Mesonephros is a hemopoietic organ, which first starts to perform the hemopoietic function, and executes it until the end of the life cycle of fish. Cell development of erythropoietic and lymphocytopoiesis series is over in the prolarvaperiod of the development in the hematopoietic tissue of the kidney, and the formation of the granular series occurs in the larval period, and eosinophilic myelocytes are marked much earlier than in other hematopoietic organs (the 43 stage of the development), and a bit later — neutrophil myelocytes. Practical value. Systematized data on the specifics of hematopoiesis processes and patterns of development of hemopoietic organs in sturgeon species will be useful both for researchers and fish farmers. This is due to the fact that the course of hemopoiesis most fully reflects each specific stage of the development of sturgeon species, being an instant reaction of a number of body tissues to any changes in the internal and external environment

Thomas Eliot Haworth – One of the best experts on this subject based on the ideXlab platform.

Grotjohann Norbert – One of the best experts on this subject based on the ideXlab platform.

  • Ein Fisch aus der Zeit der Dinosaurier: Der Stör, – als Kaviarlieferant bekannt, – jetzt vom Aussterben bedroht?
    Fakultät für Biologie Biologiedidaktik (Botanik und Zellbiologie), 2018
    Co-Authors: Nolding Jana, Grotjohann Norbert
    Abstract:

    Dieser Beitrag thematisiert die Biologie und die Schutzbedürftigkeit der Störe (Acipenseridae), einer urzeitlichen Familie der Knochenfische, deren Vertreter noch vor kurzer Zeit in unseren Flüssen weit verbreitet waren. Es werden Unterrichtsbezüge für die 6. bis 12. Jahrgangsstufe vorgestellt und zu den Gebieten: Ökologie, der Mensch als Umweltfaktor – Biodiversität und Wirbeltiere in verschiedenen Lebensräumen

  • Ein Fisch aus der Zeit der Dinosaurier. Der Stör, – als Kaviarlieferant bekannt, – jetzt vom Aussterben bedroht?
    Universität Bielefeld, 2018
    Co-Authors: Nolding Jana, Grotjohann Norbert
    Abstract:

    Nolding J, Grotjohann N. Ein Fisch aus der Zeit der Dinosaurier. Der Stör, – als Kaviarlieferant bekannt, – jetzt vom Aussterben bedroht? BU praktisch – Das Online-Journal für den Biologieunterricht. 2018;1(1): 5.Dieser Beitrag thematisiert die Biologie und die Schutzbedürftigkeit der Störe (Acipenseridae), einer urzeitlichen Familie der Knochenfische, deren Vertreter noch vor kurzer Zeit in unseren Flüssen weit verbreitet waren. Es werden Unterrichtsbezüge für die 6. bis 12. Jahrgangsstufe vorgestellt und zu den Gebieten: Ökologie, der Mensch als Umweltfaktor – Biodiversität und Wirbeltiere in verschiedenen Lebensräumen