Results 191 to 200 of about 5,644 (225)
Some of the next articles are maybe not open access.
The elasmobranch pupillary response
Vision Research, 1971Abstract The rate and extent of the pupillary response to light and darkness were determined for a variety of sharks and rays. Dilation required 1–60 min and constriction 1–30 min, depending on the species. All responses were non-consensual. The dilator muscle was controlled by the third cranial nerve, which probably exerts a constant dilatory tonus ...
openaire +2 more sources
Morphological abnormalities in elasmobranchs
Journal of Fish Biology, 2015A total of 10 abnormal free‐swimming (i.e. post‐birth) elasmobranchs are reported from The (Persian–Arabian) Gulf, encompassing five species and including deformed heads, snouts, caudal fins and claspers. The complete absence of pelvic fins in a milk shark Rhizoprionodon acutus may be the first record in any elasmobranch. Possible causes, including the
openaire +2 more sources
Journal of Experimental Zoology, 1990
Man has been fascinated with elasmobranchs — the sharks, skates and rays — for centuries. The visual sense of these sometimes-dangerous creatures has been much maligned; elasmobranchs have been described as seeing poorly and only at night. Since the last large review on vision in elasmobranchs (Gruber and Cohen, 1978), the field has expanded greatly ...
openaire +2 more sources
Man has been fascinated with elasmobranchs — the sharks, skates and rays — for centuries. The visual sense of these sometimes-dangerous creatures has been much maligned; elasmobranchs have been described as seeing poorly and only at night. Since the last large review on vision in elasmobranchs (Gruber and Cohen, 1978), the field has expanded greatly ...
openaire +2 more sources
Corticosteroids in plasma of elasmobranchs
Comparative Biochemistry and Physiology Part A: Physiology, 1972Abstract 1. 1. Free corticosteroids were quantified by double isotope derivative assay in thirteen plasma samples from seven species of elasmobranchs. 2. 2. In each instance, four batoids and three selachians, 1α-hydroxycortico-sterone was the principal plasmatic corticosteroid. 3. 3.
B, Truscott, D R, Idler
openaire +2 more sources
2019
This chapter looks into the differences and similarities between the two groups of fish: the teleosts and the elasmobranchs. In the data analyses done so far in this volume, the fish most considered were the teleosts (Teleostei), which represent by far the dominant group, in terms of both biomass and living number of species.
openaire +2 more sources
This chapter looks into the differences and similarities between the two groups of fish: the teleosts and the elasmobranchs. In the data analyses done so far in this volume, the fish most considered were the teleosts (Teleostei), which represent by far the dominant group, in terms of both biomass and living number of species.
openaire +2 more sources
Journal of Experimental Zoology, 1990
The teleost eye, which is commonly used as a model of the typical aquatic eye, is described as having a spherical lens of elevated equivalent refractive index and an accommodative ability involving lens movement toward the retina. The question of lens aberrations, particularly longitudinal spherical aberration, is important because the lens is ...
openaire +1 more source
The teleost eye, which is commonly used as a model of the typical aquatic eye, is described as having a spherical lens of elevated equivalent refractive index and an accommodative ability involving lens movement toward the retina. The question of lens aberrations, particularly longitudinal spherical aberration, is important because the lens is ...
openaire +1 more source
Relative Eye Size in Elasmobranchs
Brain, Behavior and Evolution, 2007Variation in relative eye size was investigated in a sample of 46 species of elasmobranch, 32 species of sharks and 14 species of batoids (skates and rays). To get a measure of eye size relative to body size, eye axial diameter was scaled with body mass using least-squares linear regression, using both raw species data, where species are treated as ...
Lisney, Thomas J., Collin, Shaun P.
openaire +3 more sources
Comparative hemostasis: Studies on elasmobranchs
Comparative Biochemistry and Physiology Part A: Physiology, 1972Abstract 1. 1. Elasmobranch blood contains thrombocytes, which are agglutinated by thrombin but not by ADP. Dogfish thrombocytes appear to adhere to dogfish collagen. 2. 2. Elasmobranch blood clots very slowly often being still uncoagulated after 48 hr. 3. 3. Adding calcium accelerates elasmobranch clotting.
openaire +2 more sources
2015
1. Introduction 2. Overview of the Elasmobranch Gill 3. Evolution of the Gill: Elasmobranch Gill Structure in Relation to Other Fishes 4. Elasmobranch Versus Teleost Ventilation 5. Details of the Elasmobranch Gill 5.1. Gross Morphology – Unique Features 5.2. Gill Vasculature 5.3. The Gill Epithelium 6.
openaire +1 more source
1. Introduction 2. Overview of the Elasmobranch Gill 3. Evolution of the Gill: Elasmobranch Gill Structure in Relation to Other Fishes 4. Elasmobranch Versus Teleost Ventilation 5. Details of the Elasmobranch Gill 5.1. Gross Morphology – Unique Features 5.2. Gill Vasculature 5.3. The Gill Epithelium 6.
openaire +1 more source
2011
Few studies of sex differentiation in elasmobranchs exist. Chieffi's comparative work on Torpedo ocel/ata, T. marmora/a, and Scy!iorhinus canicula are the most complete, and his comparisons with other published accounts of sex differentiation (Picon 1962) show parallels.
openaire +1 more source
Few studies of sex differentiation in elasmobranchs exist. Chieffi's comparative work on Torpedo ocel/ata, T. marmora/a, and Scy!iorhinus canicula are the most complete, and his comparisons with other published accounts of sex differentiation (Picon 1962) show parallels.
openaire +1 more source