Results 21 to 30 of about 7,710 (226)

Age, growth and reproductive biology of two endemic demersal bycatch elasmobranchs: Trygonorrhina fasciata and Dentiraja australis (Chondrichthyes: Rhinopristiformes, Rajiformes) from Eastern Australia [PDF]

open access: yesZoologia (Curitiba), 2020
Bottom-dwelling elasmobranchs, such as guitarfishes, skates and stingrays are highly susceptible species to bycatch due to the overlap between their distribution and area of fishing operations.
Marcelo Reis, Will F. Figueira
doaj   +3 more sources

Morphological description of Dipturus mennii (Chondrichthyes: Elasmobranchii: Rajidae) and its differentiation from Dipturus trachyderma

open access: yesZoologia (Curitiba), 2011
Squamation patterns and skeletal anatomy (neurocranium, visceral arches, synarcual cartilage, scapulocoracoid, puboischiadic bar, and mixopterigium) of Dipturus mennii Gomes & Paragó, 2001 are described as a contribution to our limited knowledge of the ...
Renan A Moreira   +2 more
doaj   +1 more source

Rail skates for fixing rolling stock on the station tracks. Ground tests

open access: yesВестник Научно-исследовательского института железнодорожного транспорта, 2016
Currently manual brake shoes on Russian railways are used to solve two main tasks: to adjust uncoupling speed at humps (hump shoes), and to fix the rolling stock on the railway tracks.
D. P. Markov   +7 more
doaj   +1 more source

Ice-rich slurries can account for the remarkably low friction of ice skates

open access: yesJournal of Glaciology, 2023
Ice skates are remarkably slippery across a wide range of conditions. We propose, based on earlier observations and new modeling, that an ice-rich slurry forms rapidly beneath a skate blade during each stride to lubricate the interface.
James H. Lever, Austin P. Lines
doaj   +1 more source

Comparative demography of skates: life-history correlates of productivity and implications for management. [PDF]

open access: yesPLoS ONE, 2013
Age-structured demographic models were constructed based on empirical estimates of longevity and maturity for five deepwater Bering Sea skates to investigate how observed differences in life history parameters affect population growth rates.
Lewis A K Barnett   +4 more
doaj   +1 more source

Morphological description of deepwater skate Bathyraja trachura from the North-West Pacific

open access: yesИзвестия ТИНРО, 2021
Morphological description is given for deepwater skates Bathyraja trachura caught in the North-West Pacific in 1980–1989, both juveniles and adults. Counts for vertebras, pectoral fin, teeth rows, and intestinal valves are presented.
V. N. Dolganov
doaj   +1 more source

Release of unwanted flat-bodied fish from a horizontal-bar grid system as revealed through comparative fishing trials and underwater video observations

open access: yesAquaculture and Fisheries, 2021
Grid systems separate fish species primarily through physical means: fish size and body shape. On Georges Bank off the northeast USA, many species of flounders are overfished, and their catch needs to be reduced.
Christopher B. Rillahan, Pingguo He
doaj   +1 more source

Exploring variability in the diet of depredating sperm whales in the Gulf of Alaska through stable isotope analysis [PDF]

open access: yesRoyal Society Open Science, 2020
Sperm whales interact with commercially important groundfish fisheries offshore in the Gulf of Alaska (GOA). This study aims to use stable isotope analysis to better understand the trophic variability of sperm whales and their potential prey, and to use ...
Lauren A. Wild   +3 more
doaj   +1 more source

Bone Skates from an Early Stage of the Alan Culture Burial of the North Caucasus

open access: yesНижневолжский археологический вестник
The article publishes a mortuary complex of the late 3rd – early 4th centuries AD of the early stage of the North Caucasian Alan culture from kurgan 23 of the Oktyabrskiy I burial field in the Republic of North Ossetia –Alania, which contained a pair of ...
Zalina P. Kadzaeva   +1 more
doaj   +1 more source

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