Download or read book Studies in the Control of Pigment Cells and Light Reactions in Recent Teleost Fishes written by Priscilla Rasquin and published by . This book was released on 1958 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies in the Control of Pigment Cells and Light Reactions in Recent Teleost Fishes Part 1 Morphology of the Pineal Region Part 2 Reactions of the Pigmentary System to Hormonal Stimulation Bulletin of the AMNH V 115 Article 1 written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies in the Control of Pigment Cells and Light Reactions in Recent Teleost Fishes written by Priscilla Rasquin and published by . This book was released on 1958 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies in the Control of Pigment Cells and Light Reactions in Recent Teleost Fishes written by Priscilla Rasquin and published by . This book was released on 1959 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pt. 1. "The histomorphology of the pineal area is described for 33 species of teleosts. The pineal organ is composed of an end-vesicle, a stalk, and a short pedicle, but variations in size and development of the vesicle and stalk create great differences in the morphology of the organ in different species. 2. In general, those species in which the pineal organ is exposed to light passing through transparent overlying tissues, or in which the pineal area can be exposed to light by concentration of pigment granules in over-lying chromatophores, show a specialization of the pineal organ. The end-vesicle in particular covers a wide area, spreading over parts of the forebrain and optic lobes, with the surface area of pineal cells greatly increased by invaginations and convolutions of the walls. Those species in which the pineal organ is deeply buried under many tissue layers are found to have a more simplified structure, with the vesicle limited to a simple sac. 3. Cytological study shows that the pineal is a complex organ probably having both sensory and secretary functions. Nerve endings seen near the pineal cells are connected with ganglion cells. Fibers from the ganglion cells progress down the walls of the stalk and enter the habenular commissure. Two types of epithelioid cells form the inner walls of the pineal vesicle and stalk, resting on a connective-tissue, basement membrane. These epithelioid or pineal cells either are sloughed off into the lumen, or parts of them are broken off into the lumen to form an apocrine secretion. 4. The apocrine secretion of the pineal can be delivered to the cerebrospinal fluid through the opening in the base of the stalk or pedicle that connects the lumen of the pineal stalk with the third ventricle of the diencephalon. 5. The pineal secretion in teleosts is composed, at least in part, of glycogen and glyco-protein. In some species, as Atherina stipes, the pineal cells accumulate glycogen during hours of darkness. The quantity of glycogen decreases during hours of light. 6. Intraperitoneal implantation of fresh Atherina pineals caused no observable effect on pigmentation in Cyprinodon. 7. Pinealectomy in Astyanax had no effect on pituitary, thyroid, or gonads and no observable effect on pigmentation. No significant changes in phototaxis were observed, owing perhaps to the dense pigmentation over the top of the head in this species. 8. Although no specific sensory cells were discovered in the teleost pineals, the behavior of fishes shows a sensory influence of this area of the brain. Other results of this report indicate that there is no evidence for an endocrine function of the secretion of the teleost pineal gland" -- pt. 2. "Thirty-five species of teleosts were injected with adrenalin or with intermedin or with both hormones at different times. 2. Fishes can be grouped in three categories according to the reaction of the melanophore system to adrenaline: (1) fishes in which adrenalin causes concentration of pigment granules within all the melanophores, (2) fishes in which only the internal melanophores show pigment concentration, and (3) fishes in which none of the melanophores is affected by adrenalin injection. 3. In some species, dermal melanophores are not concentrated by the effects of adrenalin injection but are responsive to the direct application of the hormone to the skin. 4. The lipophores respond to adrenalin either by dispersion or concentration of pigment granules, depending upon the species. 5. Leucophores respond to adrenalin injection by dispersion of guanin granules. 6. Dispersion of melanin granules in chromatophores as a response to intermedin was confined to Ameiurus, Gambusia, Astyanax, and Atherina among the species used for this report. All other species showed no reaction of melanophores to intermedin. 7. All species responded to intermedin by dispersion of lipophores. 8. Six mammalian anterior pituitary preparations were tested for their effects on the pigmentation of the fresh-water characin Astyanax mexicanus and the marine goby Bathygobius soporator. These hormones were FSH, LH, TSH, MSH, prolactin, and growth hormone. In addition, ACTH was used on Bathygobius. 9. MSH administration caused dispersion of melanin granules in the melanophores of Astyanax. No pigmentary reactions were noted in this species after injection of any other pituitary fractions. 10. Administration of all the anterior lobe preparations caused dispersion of pigment granules in the xanthophores of Bathygobius. No reaction was noted in the melanophores. 11. MSH was administered to eight other species with the following results: in fresh water, Ameiurus nebulosus, dispersion of melanophores; in sea water, Gambusia sp. and Atherina stipes, dispersion of melanophores; Cyprinodon baconi and Monacanthus ciliatus, no reaction; Gambusia sp., Lutianus apodus, Irideo bivitatta, and Chaetodon striatus, dispersion of xanthophores or erythrophores"--P. 64-65.

Download or read book Resource Publication written by and published by . This book was released on 1982 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Control of Chromatophores written by M. Fingerman and published by Elsevier. This book was released on 2013-10-22 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Control of Chromatophores focuses on the color changes in animals, particularly among the invertebrates. Cells containing pigment that can disperse or concentrate, thereby changing the tint of the organism in which they lie, are known as chromatophores. Well-developed, functional chromatophore systems are common among cephalopods, crustaceans, and poikilotherm vertebrates. Rare instances are found among other groups such as annelids, echinoderms, and insects. After an introduction to the types, chemistry, and functional significance of chromatophores, this text concentrates on the chromatophores of crustaceans, insects, cephalopods, echinoderms, and vertebrates. This book is recommended for students and biologists conducting work on chromatophores and color changes.

Download or read book The Control of Fish Migration written by R.J.F. Smith and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fish migration is important and spectacular. Migratory fish gather energy in one portion of the environment and transport it to other areas, where it often becomes available to humans or to other elements in the ecosystem. Migration brings fish into situations that allow easy harvest as they concentrate along migration routes. Their journeys also make them vulnerable to human intereference at critical points along their route. Salmon, for example, may harvest plankton in the open ocean and transport that food energy to coastal and inland regions, where it is captured by fisheries or deposited in inland streams and utilized by the flora and fauna of the region. These salmon are able to complete journeys of thousands of kilometers from their natal streams to oceanic feeding grounds and back to the same home streams, an accomplishment that strains our credi bili ty . We now understand some of the timing and guiding stimuli used in these migrations, and mechanisms can be logically proposed, on the basis of the established abilities of fishes, to account for the unexplained portions of the migrations. There is no single factor guiding these fish. Instead, they are dependent on the presence in their environment of a great variety of appropriate orienting and timing stimuli. These stimuli are vulnerable to human interference. The more widespread and easily available the information on these requirements, the more readily fish can be protected from such interference.

Download or read book Advances in Comparative and Environmental Physiology written by and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: ADVANCES IN COMPARATIVE AND ENVIRONMENTAL PHYSIOLOGY helps biologists, physiologists, and biochemists keep track of the extensive literature in thefield. Providing comprehensive, integrated reviews and sound, critical, and provocative summaries, this series is a must for all active researchers in environmental and comparative physiology. The present volume contains six reviews on: - Motile Activities of Fish Chromatophores. - Epithelial Transport of Heavy Metals. - Heavy Metal Cytotoxicity in Marine Organisms. - Comparative Pulmonary Morphology and Morphometry. - Molecular Adaptations in Resistance to Penicillins. - Molecular Adaptations of Enzymes From Thermophilic and Psychrophilic Organisms.

Download or read book Fish Physiology written by and published by Academic Press. This book was released on 2014-05-14 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fish Physiology

Download or read book Biospeleology written by A. Vandel and published by Elsevier. This book was released on 2013-09-11 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biospeleology: The Biology of Cavernicolous Animals discusses the fundamental concepts in understanding the biological make up of cave-dwelling animals. The title aims to relate the subterranean world as a habitat for organisms. The first part of the text tackles basic concerns, such as the concept of the subterranean world and cavernicoles, along with the history and research concerns in biospeleology. Next, the selection enumerates the subterranean flora and fauna, along with the geographical distribution and ecology of cavernicoles. The next two parts detail the physiology and behavior of cavernicoles, while the last part tackles the evolution of cavarnicoles. The book will be of great interest to zoologists, biologists, and ecologists who wish to gain a better understanding of the biological properties of subterranean organisms.

Download or read book On the Relationship of Teleost Scales to Pigment Patterns written by Charles Marcus Breder and published by . This book was released on 1972 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physiology and Pathology of Adaptation Mechanisms written by Eörs Bajusz and published by Elsevier. This book was released on 2013-10-22 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physiology and Pathology of Adaptation Mechanisms: Neural – Neuroendocrine – Humoral is a collection of papers that covers various aspects of the vital physiologic mechanisms involved in adaptive reactions. The title first covers the development of regulatory processes, and then proceeds to tackling the regulatory and adaptive functions of the pituitary-adrenocortical system. Next, the selection deals with the regulation of adaptive hormones, along with topics about adaptation to environmental temperature variation. The text also deals with the neural, neuroendocrine, and hormonal regulatory and adaptation mechanisms. The book will be of great interest to researchers and practitioners of biology and medicine. Other evolutionary scientists will also benefit from the text.

Download or read book Advances in Marine Biology written by and published by Academic Press. This book was released on 1962-01-01 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Marine Biology

Download or read book Canadian Journal of Zoology written by and published by . This book was released on 2009-05 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Pineal Gland written by Russel J. Reiter and published by CRC Press. This book was released on 2020-03-25 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in 1981: This volume talks about new research understandings of the function of the Pineal Gland which was thought to have no legitimate function.

Download or read book Microscopic Anatomy of Salmonids written by William T. Yasutake and published by . This book was released on 1983 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Physiology of Fishes written by Margaret E. Brown and published by Academic Press. This book was released on 2013-10-22 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Physiology of Fishes, Volume II: Behavior focuses on the physiology of fishes, as well as nervous and visual systems, sense organs, fish behavior, and pigment of fishes. The book first offers information on the nervous system, including the telencephalon, mesencephalon, metencephalon, medulla oblongata and spinal cord, autonomic nervous system, and functional development of the nervous system. The manuscript then elaborates on the sense organs, acoustico-lateralis system, and olfactory and gustatory senses of fishes. Discussions focus on component parts of the visual system, photoreceptive functions, lateral line, and the labyrinth. The manuscript takes a look at the ethological analysis of fish behavior and reproductive and parental behavior. Topics include coordinating and releasing mechanisms, ecological relationships, endocrine mechanisms, and motor processes. The text also touches on electric organs, luminous organs of fishes, and pigment of fishes. The publication is a valuable reference for readers interested in the physiology of fishes.