Results 11 to 20 of about 1,891 (95)

Determination of limited histotrophy as the reproductive mode in Mustelus schmitti Springer, 1939 (Chondrichthyes: Triakidae): analysis of intrauterine growth of embryos

Neotropical Ichthyology
This work analyzed length-mass relationship, growth in length, mass variations and dynamic of yolk sac depletion of Mustelus schmitti embryos, extracted from females catched by the artisanal fishery acting off La Paloma (34°39'S, 54°10'W, Uruguay) during
Luis Orlando, Inés Pereyra, Santiago Silveira, Laura Paesch, Maria Cristina Oddone, Walter Norbis   +5 more
doaj   +2 more sources

Morphological indicators of initial reproductive commitment in Mustelus schmitti (Springer 1939) (Chondrichthyes, Triakidae): folliculogenesis and ovarian structure over the life cycle

Brazilian Journal of Biology
This work provides information about the sexual commitment and the folliculogenesis of the gatuzo, Mustelus schmitti. A total of 112 females of all maturity stages were fished in the Bahía Blanca estuary, between 2009 and 2010.
EJ Galíndez, M Díaz Andrade, S Estecondo   +2 more
doaj   +2 more sources

Distribución y biología de Squalus acanthias, Mustelus schmitti y Galeorhinus vitamínicus en el Mar Argentino en agosto-setiembre de 1978. (Chondrichthyes)

Revista del Museo de La Plata
Durante el 5º crucero del ?Shinkai Maru? (25 de agosto al 15 de septiembre de 1978). El Lic. H. L. López y el autor, se ocuparon de preparar la lista de especies capturadas (Menni et al., 1981) y de hacer observaciones sobre algunas especies de interés.
Roberto Carlos Menni
doaj   +2 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

Responses of aquaculture fish to climate change‐induced extreme temperatures: A review

Journal of the World Aquaculture Society, Volume 53, Issue 2, Page 314-366, April 2022., 2022
Abstract Climate change‐induced extreme temperature events are becoming more intense and frequent. For fish, temperature is the master abiotic factor that controls and limits fish development and physiology at all stages of aquaculture. Major physiological constraints at the individual level underpin changes in fish growth, hemato‐physiology ...
Md Jakiul Islam, Andreas Kunzmann, Matthew James Slater   +2 more
wiley   +1 more source

Tagging, ranging patterns, and behavior of franciscana dolphins (Pontoporia blainvillei) off Argentina and Brazil: Considerations for conservation

Marine Mammal Science, Volume 38, Issue 2, Page 571-605, April 2022., 2022
Abstract The franciscana dolphin, Pontoporia blainvillei, is one of the most threatened cetaceans in the Southwestern Atlantic. Within their limited coastal range off Argentina, Uruguay, and Brazil, franciscanas face human activities, including artisanal gillnet fishing and coastal development.
Randall S. Wells, Marta J. Cremer, Leonardo G. Berninsone, Diego Albareda, Krystan A. Wilkinson, M. Andrew Stamper, Renan L. Paitach, Pablo Bordino   +7 more
wiley   +1 more source