Results 71 to 80 of about 3,658 (231)

A Review of the Status of Sharks, Rays and Chimaeras of Panama to Guide Research and Conservation

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 35, Issue 4, April 2025.
ABSTRACT Chondrichthyan fishes (sharks, rays and chimaeras) are a group of high conservation concern globally. Species are impacted by varying threats, although fishing pressure is the primary stressor causing population declines. Panama comprises both Pacific and Caribbean coastlines with a diversity of estuarine and marine habitats supporting small ...
Jorge Manuel Morales‐Saldaña, Hector M. Guzmán, Angel J. Vega, Yolani A. Robles, Luis A. Montes, Peter M. Kyne   +5 more
wiley   +1 more source

Mitigating the effect of by‐catch on endangered marine life

Animal Conservation, Volume 28, Issue 2, Page 172-184, April 2025.
Fishing gears cause substantial impacts on the oceans and their ecosystems, and many marine animals, such as sea turtles, marine mammals, seabirds and elasmobranchs, end up as by ‐catch. In this paper, the most effective mitigation measures were investigated for each group, taking into account the fishing gear with which they interact most.
M. Villafáfila, A. J. Carpio, M. L. Rivas   +2 more
wiley   +1 more source

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

Design and Validation of an Open–Close Device for Integrated Environmental DNA Sampling Detects A Depth Gradient in Indian Ocean Deep‐Sea Fish Assemblages

Ecology and Evolution, Volume 15, Issue 2, February 2025.
The goal of this study was to leverage existing survey technology to design and test an eDNA sampler that captures an integrated eDNA sample over the length of a deep‐water transect. We provide a biological interpretation of the resulting data, demonstrating the usefulness of such technology to understand the ocean environments, using fish species as ...
Cindy Bessey, Andrew Martini, Alasdair Currie, Will Ponsonby, Aaron Tyndall, Ryan Crossing, Vinícius Werneck Salazar, Kathryn L. Dawkins, John J. Pogonoski, Glenn Moore, Nick Mortimer, John K. Keesing   +11 more
wiley   +1 more source

Climate Change and invasibility of the Antarctic benthos [PDF]

, 2007
Benthic communities living in shallow-shelf habitats in Antarctica (<100-m depth) are archaic in their structure and function. Modern predators, including fast-moving, durophagous (skeleton-crushing) bony fish, sharks, and crabs, are rare or absent ...
A Brandt, A Brandt, A Brandt, A Brandt, A Clarke, A Clarke, A Clarke, A Clarke, A Clarke, AL Allcock, Andrew Clarke, BA Seibel, Brad A. Seibel, Cheryl D. Wilga, D Thies, DA Hodgson, Daniel B. Blake, DS Coombs, EW Dawson, G Chapelle, GA Knox, GA Lovrich, GE Hofmann, GJ Vermeij, JC Carrier, JE Werner, JH Lipps, JM Raguá-Gil, JP Kennett, JS Pearse, JT Eastman, JT Eastman, JW Wakeling, L Watling, LC Ivany, LI Comoglio, Lloyd S. Peck, LS Peck, M Klages, MA Bitner, P Huybrechts, PA Fields, PD Glorioso, PM Arnaud, Pörtner H-O, R Revelle, RB Aronson, Richard B. Aronson, RJ Menzies, RM Feldmann, S Thatje, S Thatje, SM Stanley, Snelgrove PVR, ST Ahyong, Sven Thatje, T Antezana, T Brey, TJ Page, U Piatkowski, WE Arntz, WE Arntz, WE Arntz   +62 more
core   +1 more source

Identifying Spatial Patterns of Egg Nursery Habitat for a Demersal Shark in the Northwestern Mediterranean Sea: Conservation and Management Implications

Diversity and Distributions, Volume 31, Issue 2, February 2025.
ABSTRACT Aim Oviparous elasmobranchs lay benthic eggs with long incubation periods, many of which also require habitat‐forming sessile organisms for their development. However, they are threatened by bottom‐trawling fishing impacts. Here, we aimed to identify the suitable habitat distribution of small‐spotted catshark (Scyliorhinus canicula) egg ...
Miguel López, Morane Clavel‐Henry, Nixon Bahamon, Maria Vigo, Marc Balcells, Antoni Sánchez‐Márquez, Joan Navarro, Joan B. Company   +7 more
wiley   +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 description of Dipturus mennii (Chondrichthyes: Elasmobranchii: Rajidae) and its differentiation from Dipturus trachyderma

Zoologia (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, Ulisses L Gomes, Marcelo R. de Carvalho   +2 more
doaj   +1 more source

Length-weight relationship of marine fish species off Sao Sebastiao system, Sao Paulo, Southeastern Brazil [PDF]

, 2000
The parameters a and b of the length-weight relationship of the form W = a . L super(b) were estimated for 57 fish species sampled in Sao Sebastiao Channel and shelf system in 1997, Sao Paulo, Brazil. The b values ranged from 2.746 to 3.617.
Muto, E.Y., Soares, L.S.H., Wongtschowski, C.L.D.B.R.   +2 more
core  

Morphology and dynamics of male gametogenesis in Sympterygia bonapartii (Chondrichthyes, Rajidae) from Northern Patagonia

Iheringia: Série Zoologia, 2015
The smallnose fanskate, Sympterygia bonapartii Müller & Henle, 1841 is one of the most disembarked items in commercial harbors in Argentina. In this work, the microscopic architecture of mature male gonads and the dynamics of cysts development are ...
Ana C. Moya, María C. Díaz Andrade, Elena J. Galíndez   +2 more
doaj   +1 more source