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Hybrids between Australian and common blacktip shark
Published online on 17. December 2011 Detection of interspecies hybridisation in Chondrichthyes: hybrids and hybrid offspring between Australian (Carcharhinus tilstoni) and common (C. limbatus) blacktip shark found in an Australian fishery Morgan et al. ABSTRACT: Interspecies hybridisation in nature is a well-studied phenomenon, but it has not been analysed using genetic markers in the class
Mercury bioaccumulation in elasmobranchs
by Nicholas Kutil and David L. Taylor. ABSTRACT: Mercury (Hg) is a toxic environmental contaminant that bioaccumulates in fish tissues, including numerous marine species. Cartilaginous fish of the subclass Elasmobranchii are important ecological constituents of marine ecosystems, yet the fate of Hg contaminants in their body tissues is largely unknown. In this study, four species
Contribution to the taxonomy and distribution of sharks from Thailand
Accepted 2nd January 2012 Contribution to the taxonomy and distribution of six shark species (Chondrichthyes, Elasmobranchii) from the Gulf of Thailand Simon Weigmann ABSTRACT: A collection of nine shark specimens from six different species, obtained in 1993 from the Gulf of Thailand, was examined in this study. The sharks were determined, morphometrically and meristically analyzed,
Studies on the smooth hammerhead shark in India
Published in 2011 Studies on population structure, mortality, growth and exploitation level of smooth hammerhead Sphyrna zygaena (L) (Carcharhiniformes – Sphyrnidae) in the coastal region of Kerala, India Sayd Manjusha, Balakrishna Madhusoodana Kurup, NarayannaneSaravannane, Veloorkirakathil Narayana Sanjeevan ABSTRACT: The hammerhead sharks (Sphyrnidae), have a circumglobal distribution in tropical and warm-temperate waters, and the smooth hammerhead,
Bioturbation by stingrays at Ningaloo Reef, Western Australia
Published online on 08. December 2011 Owen R. O’Shea, Michele Thums, Mike van Keulen and Mark Meekan ABSTRACT: Stingrays are an important part of the biomass of the fishes in shallow coastal ecosystems, particularly in inter-reefal areas. In these habitats, they are considered keystone species – modifying physical and biological habitats through their foraging and
A Natural Deletion of the HoxC Cluster in Elasmobranch Fishes
Published on 16. December 2011 Benjamin L. King, J. Andrew Gillis, Heather R. Carlisle, Randall D. Dahn. ABSTRACT: Hox proteins are a metazoan-specific family of transcription factors that are required for developmental patterning. The genomic arrangement of Hox genes into four paralogous clusters is a primitive feature of jawed vertebrates. By using high-throughput sequencing, we
Permanent magnets as elasmobranch bycatch reduction devices
Analysis of permanent magnets as elasmobranch bycatch reduction devices in hook-and-line and longline trials Craig P. O’Connell, Daniel C. Abel, Eric M. Stroud, Patrick H. Rice. ABSTRACT: Previous studies indicate that elasmobranch fishes (sharks, skates and rays) detect the Earth’s geomagnetic field by indirect magnetoreception through electromagnetic induction, using their ampullae of Lorenzini. Applying this
Bomb radiocarbon dating of sandbar shark Carcharhinus plumbeus
Bomb radiocarbon and tag-recapture dating of sandbar shark (Carcharhinus plumbeus) Allen H. Andrews, Lisa J. Natanson, Lisa A. Kerr, George H. Burgess, Gregor M. Cailliet. ABSTRACT: The sandbar shark (Carcharhinus plumbeus) was the cornerstone species of western North Atlantic and Gulf of Mexico large coastal shark fisheries until 2008 when they were allocated to a
Distribution and size composition of the North Pacific spiny dogfish
Published online on 22. November 2011 New data on the distribution and size composition of the North Pacific spiny dogfish Squalus suckleyi (Girard, 1854) Alexei M. Orlov, Vadim F. Savinykh, Eugeny F. Kulish and Dmitry V. Pelenev ABSTRACT: The results of long-term research on the spatial and vertical distribution of the North Pacific spiny dogfish
Taxonomy of two species of dogfish in Tunisian waters
Published online on 22. November 2011 Taxonomic research on Squalus megalops (Macleay, 1881) and Squalus blainvillei (Risso, 1827) (Chondrichthyes: Squalidae) in Tunisian waters (central Mediterranean Sea) Sondes Marouani, Raja Chaâba, Hasna Kadri, Bechir Saidi, Abderrahmen Bouain, Ferruccio Maltagliati, Peter Last, Bernard Séret and Mohamed Nejmeddine Bradai ABSTRACT: Two species of spurdog of the genus Squalus
Nektobenthic Elasmobranchs off the Balearic Islands Spain
Published online on 22. November 2011 Inter- and intra-annual trends and status indicators of nektobenthic elasmobranchs off the Balearic Islands (northwestern Mediterranean) Beatriz Guijarro, Antoni Quetglas, Joan Moranta, Francesc Ordines, Maria Valls, Natalia González and Enric MassutÍ ABSTRACT: We assessed the elasmobranch communities exploited by the bottom trawl fishery off the Balearic Islands (northwestern Mediterranean)
Recurring Parthenogenesis in a Zebra shark at Dubai Aquarium
Annually recurring parthenogenesis in a zebra shark Stegostoma fasciatum D. P. Robinson, W. Baverstock, A. Al-Jaru, K. Hyland, K. A. Khazanehdari ABSTRACT: A zebra shark, Stegostoma fasciatum, held in captivity at the Burj Al Arab aquarium, produced embryos and pups in the absence of a male. A total of 15 pups were produced from eggs
Silky Sharks caught by Japanese Longliners in Eastern Pacific Ocean
Publication year 2011 Estimate of catch for silky shark (Carcharhinus falciformis) caught by Japanese longline vessel in the EPO from 2000 and 2010. Yasuko Semba SUMMARY: This is the first report of catch estimated for silky shark (Carcharhinus falciformis) caught by Japanese longline fishery operating in the EPO. Silky shark is distributed in the tropical
Analysing catches of Silky Sharks in Ecuador
Publication year 2011 Case Study: Biological Aspects Fishing of Silky Shark Carcharhinus falciformis (Müller and Henle, 1839) in Ecuador Martínez-Ortiz et al. SUMMARY: A number of 7,090 silky shark Carcharhinus falciformis were analyzed. The records of biological data were obtained from September 2003 to December 2010. The main landing months were March, April and June.
Predator-prey interactions between Great white sharks and Seals
Published online on 30. November 2011 Marine predator-prey contests: Ambush and speed versus vigilance and agility R. Aidan Martin and Neil Hammerschlag ABSTRACT: Differences in relative strengths and weaknesses between predators and prey under tactical contexts result in complex and dynamic contests between them. These contests are often brief and difficult to observe in marine