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Morphological and functional development of the spiral intestine in cloudy catshark
Morphological and functional development of the spiral intestine in cloudy catshark (Scyliorhinus torazame) Yuki Honda, Wataru Takagi, Marty K. S. Wong, Nobuhiro Ogawa, Kotaro Tokunaga, Kazuya Kofuji, Susumu Hyodo ABSTRACT: Cartilaginous fish have a comparatively short intestine known as the spiral intestine that consists of a helical spiral of intestinal mucosa. However, morphological and functional
Spatially congruent sites of importance for global shark and ray biodiversity
Spatially congruent sites of importance for global shark and ray biodiversity Danielle H. Derrick, Jessica Cheok, Nicholas K. Dulvy ABSTRACT: Many important areas identified for conservation priorities focus on areas of high species richness, however, it is unclear whether these areas change depending on what aspect of richness is considered (e.g. evolutionary distinctiveness, endemicity, or
A new animal-borne imaging system for studying the behavioral ecology of small sharks
A new animal-borne imaging system for studying the behavioral ecology of small sharks: laboratory and field evaluations Craig P. O’Connell, Caroline Collatos, Nicholas D. Picha, Pingguo He ABSTRACT: The use of animal-borne imaging and environmental data collection systems (AVEDs) can provide behavioral and ecological information of animals that many other technologies cannot usually offer. However,
Estimating population parameters of broadnose sevengill sharks
Estimating population parameters of broadnose sevengill sharks (Notorynchus cepedianus ) using photo‐ID capture‐recapture Robert Lewis, Steve Dawson, Will Rayment ABSTRACT: The broadnose sevengill shark (Notorynchus cepedianus ) is a common high trophic level predator around coastal New Zealand. Data on the ecology of the species in New Zealand are severely lacking and anthropogenic impacts are
Ontogenetic trophic segregation between two threatened smooth-hound sharks in the Central Mediterranean Sea
Ontogenetic trophic segregation between two threatened smooth-hound sharks in the Central Mediterranean Sea Manfredi Di Lorenzo, Salvatrice Vizzini, Geraldina Signa, Cristina Andolina, Gabriele Boscolo Palo, Michele Gristina, Carlotta Mazzoldi, Francesco Colloca ABSTRACT: Elasmobranchs are among the species most threatened by overfishing and a large body of evidence reports their decline around the world. As they
Capture of a Blue Shark by a Swordfish Longliner off Fethiye
Capture of a Blue Shark Prionace glauca (Linnaeus, 1758) (Chondrichthyes: Charcharhinidae) by a Swordfish Longliner off Fethiye (Mediterranean Sea, Turkey) Okan Akyol, Tevfik Ceyhan ABSTRACT: On 25 December 2012, a specimen of Prionace glauca (Linnaeus, 1758) was caught by a swordfish longliner along with 9 swordfish together off Fethiye at a depth of 1200 m.
Provoked Non-Fatal Attacks to Divers by Sandbar Shark
Provoked Non-Fatal Attacks to Divers by Sandbar Shark, Carcharhinus plumbeus (Carcharhiniformes: Carcharhinidae), off Taşucu Coast (Ne Mediterranean Sea, Turkey) Ergüden D., Ayas D., Kabasakal H. ABSTRACT: On 26 August 2019, two commercial divers, who were diving for the routine check and cleaning of the separate aquaculture net cages, were attacked by several sandbar sharks, Carcharhinus
Armored eyes of the whale shark
Armored eyes of the whale shark Taketeru Tomita, Kiyomi Murakumo, Shinya Komoto, Alistair Dove, Masakatsu Kino, Kei Miyamoto, Minoru Toda ABSTRACT: This report elaborates on adaptations of the eyes of the whale shark Rhincodon typus (Elasmobranchii, Rhincodontidae), including the discovery that they are covered with dermal denticles, which is a novel mechanism of eye protection
A new genus of Rhinebothriidea from species of Psammobatis
A new genus of Rhinebothriidea from species of Psammobatis (Rajiformes: Arhynchobatidae) off Argentina SEBASTIAN FRANZESE, VERONICA A. IVANOV ABSTRACT: Two species of a new genus of Rhinebothriidea have been collected from species of Psammobatis Günther along the coast of Argentina. Semiorbiseptum gen. nov. is considered a rhinebothriidean for the presence of facially loculated bothridia borne
Chondrichthyan fishes inhabiting the northern Gulf of Mexico Part 1
An annotated checklist of the chondrichthyan fishes inhabiting the northern Gulf of Mexico Part 1: Batoidea CHRISTIAN M. JONES, WILLIAM B. III DRIGGERS, KRISTIN M. HANNAN, ERIC R. HOFFMAYER, LISA M. JONES, SANDRA J. RAREDON ABSTRACT: Herein we consolidate the information available concerning the biodiversity of batoid fishes in the northern Gulf of Mexico, including
Daily and seasonal movements of Cape Cod gray seals vary with predation risk
Daily and seasonal movements of Cape Cod gray seals vary with predation risk Jerry H. Moxley, Gregory Skomal, John Chisholm, Patrick Halpin, David W. Johnston ABSTRACT: White sharks Carcharodon carcharias and gray seals Halichoerus grypus are re-establishing their ecological roles within the Northwestern Atlantic Ocean, presenting an opportunity to understand gray seal movement and at-sea
Spatiotemporal distribution patterns of immature Australasian white sharks
Spatiotemporal distribution patterns of immature Australasian white sharks (Carcharodon carcharias) Julia L.Y. Spaet, Toby A. Patterson, Russell W. Bradford, Paul A. Butcher ABSTRACT: In Australian and New Zealand waters, current knowledge on white shark (Carcharodon carcharias) movement ecology is based on individual tracking studies using relatively small numbers of tags. These studies describe a species
Assessment of trends in the Portuguese elasmobranch commercial landings over three decades (1986–2017)
Assessment of trends in the Portuguese elasmobranch commercial landings over three decades (1986–2017) Luís M.F.Alves, João P.S. Correia, Marco F.L. Lemos, Sara C. Novais, Henrique Cabral ABSTRACT: Portugal plays a major role in shark, skate and ray fisheries in the European Union. With the decline of these animals raising concerns amongst scientists all over the
Analysis of Shark Fisheries Typology in TPI Pangandaran
Analysis of Shark Fisheries Typology in TPI Pangandaran, Pangandaran Regency, Indonesia Indriyani Rahayu, Zuzy Anna, Achmad Rizal, Iwang Gumilar ABSTRACT: Knowledge of the shark fisheries typology for manager or related stakeholder is a supporting factor for the success of the basic fisheries management program, especially shark fisheries. This study aims to analyze the technical, social
Fisheries Biology of Blue Sharks in Sagami Bay, Japan
Fisheries Biology of Blue Sharks in Sagami Bay, Japan Hiroki Joshima, Chika Namaizawa, Tadashi Miyazaki, Daisuke Shiode, Jiro Yoshida, Masao Nemoto ABSTRACT: Blue shark (Prionace glauca) and shortfin mako shark (Isurus oxyrinchus) are recognized as pelagic sharks and highly migratory species, but these sharks appear in coastal areas. It is suggested that sharks migrate in