Results 1 to 10 of about 239 (111)

Mitochondrial Genome and Phylogenetic Analysis of the Narrownose Smooth-Hound Shark Mustelus schmitti Springer, 1939 [PDF]

Animals
Southern Brazil is home to a large biodiversity of elasmobranchs from the Brazilian coast. Several genera and species of small sharks of the Triakidae family live in this marine environment.
Walter Nisa-Castro-Neto, Paulo Guilherme Carniel Wagner, Diéssy Kipper, Vinicius Proença da Silveira, André Salvador Kazantzi Fonseca, Nilo Ikuta, Vagner Ricardo Lunge   +6 more
doaj   +5 more sources

Histochemical study of the oviducal gland and analysis of the sperm storage tubules of Mustelus schmitti Springer, 1939 (Chondrichthyes, Triakidae) [PDF]

Pesquisa Veterinaria Brasileira, 2015
: The paired oviducal glands of immature and mature females of Mustelus schmitti were examined macro and microscopically. Findings indicate that these glands possessed the same zonation as in most chondrichthyans from anterior to posterior: club ...
Fernanda Gabriela Elías
exaly   +6 more sources

Bioenergetic Model of the Highly Exploited Shark Mustelus schmitti under a Global Warming Context [PDF]

Diversity, 2023
Bioenergetic models are tools that allow the evaluation of the effect of environmental variables on fish growth. Successful implementation of this approach has been achieved in a few elasmobranch species. Our objective was to develop a bioenergetic model
Juan Manuel Molina, Seokjin Yoon, Mariano Elisio, Akihide Kasai   +3 more
doaj   +4 more sources

Unusual record of a multiple predation of the Patagonian seahorse Hippocampus patagonicus by the Narrownose smooth-hound Mustelus schmitti in Argentine coastal waters

Marine and Fishery Sciences, 2021
Seahorses (Genus Hippocampus) are rarely reported as prey items. Their low population numbers, their ability to blend with the environment and their low palatability are the features making them an unsuitable option for predators. Five individuals of the
Mauro Belleggia, María G. Pujol, María L. Estalles, Daniel E. Figueroa, Diego C. Luzzatto   +4 more
doaj   +7 more sources

Population structure, distribution and abundance patterns of the patagonian smoothhound Mustelus schmitti Springer, 1939 (Chondrichthyes, Elasmobranchii, Triakidae) in the rio de La Plata and inner continental shelf , sw Atlantic ocean (34º30'-39º30'S) [PDF]

Brazilian Journal of Oceanography, 2007
A total number of 4824 Mustelus schmitti was sampled. Females ranged from 25 to 93 cm in spring and from 28 to 90 cm in summer. Males ranged from 34 to 82 and from 28 to 77 cm, respectively.
Maria Cristina Oddone, Laura Paesch, Walter Norbis   +2 more
exaly   +4 more sources

Slippery and Smooth Shark Skin: How Mucus Transforms Surface Texture. [PDF]

J Morphol
Shark surfaces consist of denticles and a mucus layer, yet mucus is an understudied aspect of shark surfaces. Using gel‐based surface profilometry to visualize and quantify surface texture changes, we found that mucus covered denticles on the dorsal fin tip and tip of the tail's trailing edge.
Fischer MJ, Lauder GV, Wainwright DK.
europepmc   +2 more sources

Proteomic analysis of the zone of degeneration at the mitosis-meiosis transition stage in wild-caught male catshark (Scyliorhinus canicula), correlated with an unusually high-water temperature in the English Channel. [PDF]

J Fish Biol
Abstract In the context of current global change, variations in water temperature are one of the environmental conditions with serious consequences for marine life, including reproductive processes. In the small spotted catshark Scyliorhinus canicula, spermatogenesis occurs in spermatocysts composed of synchronously developing germ cells associated ...
Jeanne F, Pilet S, Heighton S, Bernay B, Sourdaine P.   +4 more
europepmc   +2 more sources

Shearing Tooth Morphology May Allow Sharks to Access Higher Trophic Levels at Smaller Sizes. [PDF]

Ecol Evol
Predator morphology imposes limitations on prey selection due to biomechanical constraints, making some prey functionally inaccessible and thereby constraining predator trophic niches. We assessed how two key components of trophic morphology—tooth shape and body size—affect prey selectivity and trophic niche in two sympatric sharks with contrasting ...
Riverón S, Raoult V, Slip DJ, Mas F, Laporta M, Pereyra I, Silveira S, Harcourt RG.   +7 more
europepmc   +2 more sources

Two thirds of species in a global shark fin trade hub are threatened with extinction: Conservation potential of international trade regulations for coastal sharks

Conservation Letters, Volume 15, Issue 5, September/October 2022., 2022
Abstract One third of chondrichthyan species (sharks, rays, and chimeras) are threatened with extinction, mainly due to unsustainable fishing. Large accessible international markets for meat and luxury products like dried fins can help drive overfishing by encouraging targeted capture or retention of high‐value export species.
Diego Cardeñosa, Stanley K. Shea, Huarong Zhang, Gunter A. Fischer, Colin A. Simpfendorfer, Demian D. Chapman   +5 more
wiley   +1 more source

First recorded case of leucism in the velvet belly lantern shark Etmopterus spinax (Squaliformes: Etmopteridae)

Journal of Applied Ichthyology, Volume 38, Issue 4, Page 455-461, July 2022., 2022
Abstract The capture of a female specimen of the velvet belly lantern shark Etmopterus spinax with abnormal skin coloration is reported. The specimen was captured off northern Spain (Bay of Biscay, North‐eastern Atlantic) in 2021 by bottom trawling. The lack of dermal melanophores combined with a normal retinal pigmentation, lead us to considerate the ...
Juan Carlos Arronte, Ana Antolínez, Rafael Bañón, José Rodríguez‐Gutiérrez, Juan José Ortíz, Juan Manuel Martínez   +5 more
wiley   +1 more source