Scientific Papers

Structure, composition, and mechanical properties of shark teeth

Structure, composition, and mechanical properties of shark teeth

Published online on 05. April 2012  Structure, composition, and mechanical properties of shark teeth Joachim Enax, Oleg Prymak, Dierk Raabe, Matthias Epple ABSTRACT: The teeth of two different shark species (Isurus oxyrinchus and Galeocerdo cuvier) and a geological fluoroapatite single crystal were structurally and chemically characterized. In contrast to dentin, enameloid showed sharp diffraction peaks

Feeding habits and trophic ecology of longtail stingrays

Feeding habits and trophic ecology of longtail stingrays

Published online on 12. April 2012 Feeding habits and trophic ecology of Dasyatis longa (Elasmobranchii: Myliobatiformes): sexual, temporal and ontogenetic effects J. López-García, A. F. Navia, P. A. Mejía-Falla, E. A. Rubio ABSTRACT: Sexual, ontogenic and temporal effects in the diet of Dasyatis longa were evaluated to determine feeding habits and trophic ecology. Numeric indices

Biology of the Greenland shark Somniosus microcephalus

Biology of the Greenland shark Somniosus microcephalus

Published online on 12. April 2012 Biology of the Greenland shark Somniosus microcephalus MacNeil, M. A., McMeans, B. C., Hussey, N. E., Vecsei, P., Svavarsson, J., Kovacs, K. M., Lydersen, C., Treble, M. A., Skomal, G. B., Ramsey, M. and Fisk, A. T. ABSTRACT: Greenland shark Somniosus microcephalus is a potentially important yet poorly studied

Pacific sleeper shark trophic ecology in the eastern North Pacific Ocean

Pacific sleeper shark trophic ecology in the eastern North Pacific Ocean

Published online on 12. April 2012 Pacific sleeper shark Somniosus pacificus trophic ecology in the eastern North Pacific Ocean inferred from nitrogen and carbon stable-isotope ratios and diet. D. L. Courtney, R. Foy ABSTRACT: Stable-isotope ratios of nitrogen (δ(15) N) and lipid-normalized carbon (δ(13) C’) were used to examine geographic and ontogenetic variability in the

Great white shark caught in Far-Eastern Russia

Great white shark caught in Far-Eastern Russia

Published on 26. March 2012 The capture of a great white shark Carcharodon carcharias Linnaeus, 1758 (Carcharodontidae) in Peter the Great Bay (Sea of Japan) V. N. Dolganov ABSTRACT: This paper reports on the first reliable capture of the Great White shark Carcharodon carcharias (length 126 cm, weight 16 kg) in Peter the Great Bay

Ampullae of lorenzini in two angel shark species

Ampullae of lorenzini in two angel shark species

Published online on 10. April 2012 Morphological observations of ampullae of lorenzini in Squatina guggenheim and S. occulta (chondrichthyes, elasmobranchii, squatinidae) Schäfer, B. T., Malavasi, C. E., Favaron, P. O., Ambrósio, C. E., Miglino, M. A., Amorim, A. F. D. and Rici, R. E. G. ABSTRACT: We have conducted a morphological study of the ampullae

Spiny dogfish DNA injection into muscles of red tilapia

Spiny dogfish DNA injection into muscles of red tilapia

Published on 05. April 2012 Evaluation of the productive performance characteristics of red tilapia (Oreochromis sp.) injected with shark DNA into skeletal muscles and maintained diets containing different levels of probiotic and amino yeast Samy Yehya El-Zaeem, Talaat Nagy Amer and Nader Ezzat El-Tawil ABSTRACT : This work aimed to study the effect of direct

Activity and habitat use of two species of stingrays from Brazil

Activity and habitat use of two species of stingrays from Brazil

Published on 30. March 2012 Activity and habitat use of two species of stingrays (Myliobatiformes: Potamotrygonidae) in the upper Paraná River basin, Southeastern Brazil Domingos Garrone Neto and Virgínia Sanches Uieda ABSTRACT: The life history of freshwater stingrays (Potamotrygonidae) under natural conditions has been poorly documented. In this study, we investigated the period of activity

Feeding behavior of Neotropical freshwater stingray

Feeding behavior of Neotropical freshwater stingray

Published on 30. March 2012 Feeding behavior of the Neotropical freshwater stingray Potamotrygon motoro (Elasmobranchii: Potamotrygonidae) Akemi Shibuya, Jansen Zuanon and Sho Tanaka ABSTRACT: The feeding mechanisms of elasmobranchs and their functioning have been receiving growing scientific attention, although less emphasis has yet to be directed towards batoid species. The present study investigated the use

Shark Type II Collagen Suppresses Rheumatoid Arthritis in Rats

Shark Type II Collagen Suppresses Rheumatoid Arthritis in Rats

Published on 28. March 2012 Oral Administration of Shark Type II Collagen Suppresses Complete Freund’s Adjuvant-Induced Rheumatoid Arthritis in Rats Lijuan Chen, Bin Bao, Nanping Wang, Jing Xie and Wenhui Wu ABSTRACT: Objective: Shark type II collagen (SCII) is extracted as a glycoprotein from the cartilage of blue shark (Prionace glauca). We aim to confirm

Cryptic lineage of hammerhead sharks

Cryptic lineage of hammerhead sharks

Published online on 24. December 2011 Cryptic hammerhead shark lineage occurrence in the western South Atlantic revealed by DNA analysis D. Pinhal, M. S. Shivji, M. Vallinoto, D. D. Chapman, O. B. F. Gadig and C. Martins ABSTRACT: A cryptic lineage of hammerhead shark closely related to but evolutionarily distinct from the scalloped hammerhead (Sphyrna

Genetic mating system of the brown smoothhound shark

Genetic mating system of the brown smoothhound shark

Published online on 16. December 2011 Genetic mating system of the brown smoothhound shark (Mustelus henlei), including a literature review of multiple paternity in other elasmobranch species Rosemary J. Byrne and John C. Avise ABSTRACT: Although an understanding of mating systems is thought to be an important component of long-term population management, these life history

Sharks as part of a study on occupational health issues in research

Sharks as part of a study on occupational health issues in research

Published on 19. March 2012 Occupational health issues in marine and freshwater research Glenn Courtenay, Derek R Smith, William Gladstone. ABSTRACT: Marine and freshwater scientists are potentially exposed to a wide variety of occupational hazards. Depending on the focus of their research, risks may include animal attacks, physiological stresses, exposure to toxins and carcinogens, and

Student Note: Save Our Sharks

Student Note: Save Our Sharks

Published online on 29. February 2012 Save our sharks: Using international fisheries law within regional fisheries management organizations to improve shark conservation Stijn van Osch INTRODUCTION: Like many fish, sharks are facing unprecedented overfishing. They have been targeted both directly for their fins and caught accidentally (bycaught) in, for instance, tuna fisheries. This has led

Redescription of Carcharhinus dussumieri and Carcharhinus sealei

Redescription of Carcharhinus dussumieri and Carcharhinus sealei

Published on 21. March 2012 A redescription of Carcharhinus dussumieri and C. sealei, with resurrection of C. coatesi and C. tjutjot as valid species (Chondrichthyes: Carcharhinidae) William T. White ABSTRACT: A taxonomic re-evaluation of the Carcharhinus sealei-dussumieri group using meristic and morphological data revealed that this group consists of 5 species. Two species, Carcharhinus coatesi