Results 71 to 80 of about 1,231 (195)

Shearing Tooth Morphology May Allow Sharks to Access Higher Trophic Levels at Smaller Sizes

Ecology and Evolution, Volume 15, Issue 8, August 2025.
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 ...
Sabrina Riverón, Vincent Raoult, David J. Slip, Federico Mas, Martín Laporta, Inés Pereyra, Santiago Silveira, Robert G. Harcourt   +7 more
wiley   +1 more source

A new skate genus Orbiraja (Rajiformes: Rajidae) from the Indo-West Pacific

, 2016
Last, Peter R., Weigmann, Simon, Dumale, Don (2016): A new skate genus Orbiraja (Rajiformes: Rajidae) from the Indo-West Pacific. Zootaxa 4184 (1), DOI: http://doi.org/10.11646/zootaxa.4184.1.
Weigmann, Simon, DON DUMALE, Last, Peter R., PETER R. LAST, Dumale, Don, SIMON WEIGMANN   +5 more
core   +1 more source

Les microhabitats d’Eudactylina similis T.scott, 1902 copépode parasite de Raja asterias Delaroche, 1809 (Elasmobranchii, Rajidae) des côtes algériennes. USTHB. Alger, Algérie, 22-26 avril 2012.

, 2022
 Les microhabitats d’Eudactylina similis T.scott, 1902 copépode parasite de Raja asterias Delaroche, 1809 (Elasmobranchii, Rajidae) des côtes algériennes 
Imane DEROUICHE (12996114), Fadila TAZEROUTI (12996369)   +1 more
core   +1 more source

Morphological study of the oviductal gland in the smallnose fanskate Sympterygia bonapartii (Müller and Henle, 1841) (Chondrichthyes, Rajidae) Estudo morfológico da glândula oviductal no smallnose fanskate Sympterygia bonapartii (Müller and henle, 1841) (Chondrichthyes, Rajidae)

Brazilian Journal of Biology, 2010
The oviductal gland is an exclusive structure of cartilaginous fishes that produces the egg jelly, forms the tertiary egg envelopes and stores sperm.
EJ Galíndez, MC. Díaz-Andrade, MS. Avaca, S. Estecondo   +3 more
doaj  

Morphological study of the oviductal gland in the smallnose fanskate Sympterygia bonapartii (Müller and Henle, 1841) (Chondrichthyes, Rajidae)

Brazilian Journal of Biology
The oviductal gland is an exclusive structure of cartilaginous fishes that produces the egg jelly, forms the tertiary egg envelopes and stores sperm.
EJ Galíndez, MC. Díaz-Andrade, MS. Avaca, S. Estecondo   +3 more
doaj   +1 more source

Commercial catches, reproduction and feeding habits of Raja asterias (Chondrichthyes: Rajidae) in a coastal area of the Tyrrhenian Sea (Italy, northern Mediterranean) [PDF]

Acta Adriatica, 2007
A total of 52 “rapido” (towed toothed beam gears) trawls were monitored in late winter-summer of the 1999-2000 period to assess the R. asterias size structure at this time of higher yields as well as 36 fishing operations performed by “volantina” (trawl ...
Marino VACCHI, Maria Grazia FINOIA, Ivan CONSALVO, Umberto SCACCO, Alessandro COLASANTE, Michele ROMANELLI   +5 more
doaj  

Using citizen science photographs to identify reproductive events in an oviparous elasmobranch

Journal of Fish Biology, Volume 107, Issue 2, Page 419-430, August 2025.
Abstract Identifying critical habitats is important for the effective management of vulnerable species. Critical habitats, such as mating or nursery grounds, support populations during key life stages and help to maximise reproductive output and population growth. In elasmobranchs, mating often happens over a defined season, suggesting sites associated
Rachel Mawer, Jane Dodd, James Thorburn, Neil M. Burns, David M. Bailey   +4 more
wiley   +1 more source

Feeding Ecology and Trophic Overlap of Sympatric Rajidae Species in the Eastern Ionian Sea (Central Mediterranean)

Fishes
The feeding ecology of sympatric elasmobranchs provides key insights into trophic interactions and species coexistence within demersal ecosystems. The current study examined the diet composition and trophic relationships of three skate species (Raja ...
Archontia Chatzispyrou, Konstantinos Charalampous, Evgenia Lefkaditou, Aikaterini Anastasopoulou, Constantin Koutsikopoulos   +4 more
doaj   +1 more source

Greenland Shark (Somniosus microcephalus) Stomach Contents and Stable Isotope Values Reveal an Ontogenetic Dietary Shift

Frontiers in Marine Science, 2019
Current knowledge on the feeding ecology of the Greenland shark (Somniosus microcephalus), a potential top predator in arctic marine ecosystems, is based on small sample sizes as well as narrow size ranges of sharks.
Julius Nielsen, Julius Nielsen, Julius Nielsen, Julius Nielsen, Jørgen Schou Christiansen, Jørgen Schou Christiansen, Peter Grønkjær, Peter Bushnell, John Fleng Steffensen, Helene Overgaard Kiilerich, Kim Præbel, Rasmus Hedeholm   +11 more
doaj   +1 more source

Fisheries and ecology of the skates (Rajiformes: Rajidae) in the English Channel

Life and Environment, 2020
Skates are the main elasmobranch species exploited in the Northern Atlantic Ocean in France and the United Kingdom, especially in the English Channel. The reported international landings show that the fishery is actually dominated by five species Raja clavata, R. brachyura, R. montagui, Leucoraja naevus and R. undulata.
openaire   +1 more source