Re-Examining the Shark Trade As a Tool for Conservation
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Your Inner Fish
CHAPTER THREE HANDY GENES While my colleagues and I were digging up the first Tiktaalik in the Arctic in July 2004, Randy Dahn, a researcher in my laboratory, was sweating it out on the South Side of Chicago doing genetic experiments on the embryos of sharks and skates, cousins of stingrays. You’ve probably seen small black egg cases, known as mermaid’s purses, on the beach. Inside the purse once lay an egg with yolk, which developed into an embryonic skate or ray. Over the years, Randy has spent hundreds of hours experimenting with the embryos inside these egg cases, often working well past midnight. During the fateful summer of 2004, Randy was taking these cases and injecting a molecular version of vitamin A into the eggs. After that he would let the eggs develop for several months until they hatched. His experiments may seem to be a bizarre way to spend the better part of a year, let alone for a young scientist to launch a promising scientific career. Why sharks? Why a form of vitamin A? 61 To make sense of these experiments, we need to step back and look at what we hope they might explain. What we are really getting at in this chapter is the recipe, written in our DNA, that builds our bodies from a single egg. When sperm fertilizes an egg, that fertilized egg does not contain a tiny hand, for instance. The hand is built from the information contained in that single cell. This takes us to a very profound problem. -
Median Fin Patterning in Bony Fish: Caspase-3 Role in Fin Fold Reabsorption
Eastern Illinois University The Keep Undergraduate Honors Theses Honors College 2017 Median Fin Patterning in Bony Fish: Caspase-3 Role in Fin Fold Reabsorption Kaitlyn Ann Hammock Follow this and additional works at: https://thekeep.eiu.edu/honors_theses Part of the Animal Sciences Commons Median fin patterning in bony fish: caspase-3 role in fin fold reabsorption BY Kaitlyn Ann Hammock UNDERGRADUATE THESIS Submitted in partial fulfillment of the requirement for obtaining UNDERGRADUATE DEPARTMENTAL HONORS Department of Biological Sciences along with the HonorsCollege at EASTERN ILLINOIS UNIVERSITY Charleston, Illinois 2017 I hereby recommend this thesis to be accepted as fulfilling the thesis requirement for obtaining Undergraduate Departmental Honors Date '.fHESIS ADVI 1 Date HONORSCOORDmATOR f C I//' ' / ·12 1' J Date, , DEPARTME TCHAIR Abstract Fish larvae develop a fin fold that will later be replaced by the median fins. I hypothesize that finfold reabsorption is part of the initial patterning of the median fins,and that caspase-3, an apoptosis marker, will be expressed in the fin fold during reabsorption. I analyzed time series of larvae in the first20-days post hatch (dph) to determine timing of median findevelopment in a basal bony fish- sturgeon- and in zebrafish, a derived bony fish. I am expecting the general activation pathway to be conserved in both fishesbut, the timing and location of cell death to differ.The dorsal fin foldis the firstto be reabsorbed in the sturgeon starting at 2 dph and rays formed at 6dph. This was closely followed by the anal finat 3 dph, rays at 9 dph and only later, at 6dph, does the caudal fin start forming and rays at 14 dph. -
Fish Leather, Anyone?
Southeast Asian Fisheries Development Center Aquaculture Department SEAFDEC/AQD Institutional Repository http://repository.seafdec.org.ph Journals/Magazines Aqua Farm News 1995 Fish leather, anyone? Aquaculture Department, Southeast Asian Fisheries Development Center Southeast Asian Fisheries Development Center, Aquaculture Department (1995). Fish leather, anyone? Aqua Farm News, 13(1), 16-17, 18. http://hdl.handle.net/10862/2458 Downloaded from http://repository.seafdec.org.ph, SEAFDEC/AQD's Institutional Repository Fish leather, anyone? SHARK LEATHER a) the existing leather tannery infrastruc Previously regarded as a by-catch of lim ture is well-developed especially around Ma ited potential, shark is now targetted by small- dras; scale fishermen in the Bay of Bengal for leather b) operating costs are relatively low; and production. c) offshore resources of sharks are not Fish, let alone shark, does not conjure up sufficiently tapped at present. images of leather goods unlike cow, goat or An environmentally significant point is that crocodile. shark and fish leathers in general are essentially The method of obtaining the raw material food industry by-products which would otherwise and the specialized nature of the market hamper be wasted. Other exotic leathers produced from success in this field and general awareness of crocodile and snake, for example, have negative potential. connotations in this respect in spite of their Shark is a hunted resource often captured increased production through culture. by small-scale fishermen only as by-catch, and primarily landed for its meat. It may therefore be Offshore resources difficult to obtain a regular supply of raw material The offshore zone is the realm of the large for what is a totally different industry. -
Caudal Fin Branding Fish for Individual Recognition in Behavior Studies
Behavior Research Methods & Instrumentation 1979, Vol. 11 (1), 95-97 NOTES are on small (3-5 em), more fragile fish, and these punches tear the subjects' fins. Conventional techniques Caudal fin branding fish for individual for small fish (e.g., Heugel, Joswiak, & Moore, 1977; recognition in behavior studies Leary & Murphy, 1975) are simply not applicable for behavioral observations. RICHARD E. McNICOL and DAVID L. NOAKES This simple and inexpensive form of heat branding Department ofZoology, University of Guelph works well. The method has been tested on several Guelph, Ontario N1G 2W1, Canada species (Table 1), with similar results. Caudal fin branding is an inexpensive technique for marking and identifying small, fragile fish. A modified APPARATUS tip on a hand-held soldering pencil is used to cauterize small holes in the caudal fin membrane. The technique is simple to use, appears to cause little trauma to the The apparatus (Figure 1) is a modified soldering fish, and lasts for at least several weeks. pencil, with the brass tip filed down by hand to a small (.s-mm) square end. The iron is heated by an internal Identifying fish in behavioral studies often presents electrical resistance using an ac power source outlet a special problem. The collars, leg bands, or colored (the model we use, "Craftrite," Eldon Industries, dyes that can be used so readily on terrestrial vertebrates Canada, Inc., costs about $5). The ac power supply is are virtually useless on fish. A variety of external tags not critical; a battery-powered iron can be used if the are commercially available, and are widely used for situation requires it. -
Design and Performance of a Fish Fin-Like Propulsor for Auvs
DESIGN AND PERFORMANCE OF A FISH FIN-LIKE PROPULSOR FOR AUVS George V. Lauder1, Peter Madden1, Ian Hunter2, James Tangorra2, Naomi Davidson2, Laura Proctor2, Rajat Mittal3, Haibo Dong3, and Meliha Bozkurttas3 1Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford St., Cambridge, MA 02138, Phone: 617-496-7199; Email: [email protected] 2 BioInstrumentation Laboratory, Massachusetts Institute of Technology, Room 3-147, 77 Massachusetts Ave., Cambridge, MA 02139 3Department of Mechanical and Aerospace Engineering, 707 22nd Street, Staughton Hall The George Washington University, Washington, D.C. Abstract -- Fishes are noted for their ability to flows. In addition, many fishes can spin on their long maneuver and to position themselves accurately axis using only individual pairs of fins such as the even in turbulent flows. This ability is the result of pectoral fins. This ability is the result of the the coordinated movement of fins which extend coordinated movement of fins which extend from the from the body and form multidirectional control body and form multidirectional control surfaces that surfaces that allow thrust vectoring. We have allow thrust vectoring. We have embarked on a embarked on a research program designed to research program designed to develop a maneuvering develop a maneuvering propulsor for AUVs based propulsor for AUVs based on the mechanical design on the mechanical design and performance of fish and performance of fish fins. fins. To accomplish this goal, we have taken a five- pronged approach to the analysis and design of a II. THE SUNFISH MODEL SYSTEM propulsor based on principles derived from the Bluegill sunfish (Lepomis macrochirus) are highly study of fish fin function. -
Traceability Study in Shark Products
Traceability study in shark products Dr Heiner Lehr (Photo: © Francisco Blaha, 2015) Report commissioned by the CITES Secretariat This publication was funded by the European Union, through the CITES capacity-building project on aquatic species Contents 1 Summary.................................................................................................................................. 7 1.1 Structure of the remaining document ............................................................................. 9 1.2 Acknowledgements ....................................................................................................... 10 2 The market chain ................................................................................................................... 11 2.1 Shark Products ............................................................................................................... 11 2.1.1 Shark fins ............................................................................................................... 12 2.1.2 Shark meat ............................................................................................................. 12 2.1.3 Shark liver oil ......................................................................................................... 13 2.1.4 Shark cartilage ....................................................................................................... 13 2.1.5 Shark skin .............................................................................................................. -
Mercury Info Sheet
Methyl Mercury The danger from the sea Report by SHARKPROJECT International • Aug. 31, 2008 Updated by Shark Safe Network Sept. 12, 2009 ! SHARK MEAT CONTAINS HIGH LEVELS OF METHYL MERCURY: A DANGEROUS NEUROTOXIN In the marine ecosystem sharks are on top of the food chain. Sharks eat other contaminated fish and accumulate all of the toxins that they’ve absorbed or ingested during their lifetimes. Since mercury is a persistent toxin, the levels keep building at every increasing concentrations on the way up the food chain. For this reason sharks can have levels of mercury in their bodies that are 10,000 times higher than their surrounding environment. Many predatory species seem to manage high doses of toxic substances quite well. This is not the case, however, with humans on whom heavy metal contamination takes a large toll. Sharks at the top end of the marine food chain are the final depots of all the poisons of the seas. And Methyl Mercury is one of the biologically most active and most dangerous poisons to humans. Numerous scientific publications have implicated methyl mercury as a highly dangerous poison. Warnings from health organizations to children and pregnant women to refrain from eating shark and other large predatory fish, however, have simply not been sufficient, since this “toxic food-information” is rarely provided at the point of purchase. Which Fish Have the Highest Levels of Methyl Mercury? Predatory fish with the highest levels of Methyl Mercury include Shark, King Mackerel, Tilefish and Swordfish. Be aware that shark is sold under various other names, such as Flake, Rock Salmon, Cream Horn, Smoked Fish Strips, Dried cod/stockfish, Pearl Fillets, Lemonfish, Verdesca (Blue Shark), Smeriglio (Porbeagle Shark), Palombo (Smoothound), Spinarolo (Spiny Dogfish), and as an ingredient of Fish & Chips or imitation crab meat. -
THE SHARK and RAY MEAT NETWORK a DEEP DIVE INTO a GLOBAL AFFAIR 2021 Editor Evan Jeffries (Swim2birds)
THE SHARK AND RAY MEAT NETWORK A DEEP DIVE INTO A GLOBAL AFFAIR 2021 Editor Evan Jeffries (Swim2birds) Communications Stefania Campogianni (WWF MMI), Magdalena Nieduzak (WWF-Int) Layout Bianco Tangerine Authors Simone Niedermüller (WWF MMI), Gill Ainsworth (University of Santiago de Compostela), Silvia de Juan (Institute of Marine Sciences ICM (CSIC)), Raul Garcia (WWF Spain), Andrés Ospina-Alvarez (Mediterranean Institute for Advanced Studies IMEDEA (UIB- CSIC)), Pablo Pita (University of Santiago de Compostela), Sebastián Villasante (University of Santiago de Compostela) Acknowledgements Serena Adam (WWF-Malaysia), Amierah Amer (WWF-Malaysia), Monica Barone, Andy Cornish (WWF-Int), Marco Costantini (WWF MMI), Chitra Devi (WWF-Malaysia), Giuseppe di Carlo (WWF MMI), Caio Faro (WWF Brazil), Chester Gan (WWF-Singapore), Ioannis Giovos (iSea), Pablo Guerrero (WWF-Ecuador), Théa Jacob (WWF-France), Shaleyla Kelez (WWF-Peru), Patrik Krstinić (WWF-Adria), Giulia Prato (WWF-Italy), Rita Sayoun (WWF-France), Umair Shahid (WWF-Pakistan), Vilisoni Tarabe (WWF-Pacific), Jose Luis Varas (WWF-Spain), Eduardo Videira (WWF-Mozambique), Ranny R. Yuneni (WWF-Indonesia), Heike Zidowitz (WWF-Germany). Special acknowledgments to contribution of Glenn Sant (TRAFFIC). Special acknowledgements go to WWF-Spain for funding the scientific part of this report. For contact details and further information, please visit our website at wwfmmi.org Cover photo: © Monica Barone / WWF Safesharks Back cover photo: © Matthieu Lapinski / Ailerons WWF 2021 CONTENTS EXECUTIVE SUMMARY 4 SHARKS AND RAYS IN CRISIS 6 THE OVERALL TRADE VALUE 7 GLOBAL NETWORK ANALYSIS 8 SHARK MEAT TRADE 10 RAY MEAT TRADE 18 THE ROLE OF THE EUROPEAN UNION IN THE SHARK AND RAY TRADE 26 A GLOBAL SELECTION OF DISHES WITH SHARK AND RAY MEAT 28 RECOMMENDATIONS 30 © Nuno Queirós (APECE) / WWF 3 EXECUTIVE SUMMARY SHARKS AND RAYS ARE IN CRISIS GLOBALLY Up to 100 million are killed each year, and some populations have declined by more than 95% as a result of overfishing. -
Wave-Driven Water Motion Affects Escape Performance in Juvenile
This article is published in the Journal of Experimental Biology doi: 10.1242/jeb.234351 Effects of wave-driven water flow on the fast-start escape response of juvenile coral reef damselfishes Dominique G. Roche1* 1 Division of Evolution, Ecology and Genetics, Research School of Biology, Australian National University, Canberra, ACT, Australia Current address: Department of Biology, Carleton University, Ottawa, Ontario, Canada *Author for correspondence ([email protected]) Key words: body morphology, complex flow, swimming performance, postural disturbance, predator-prey interactions, turbulence Running title: Effect of waves on fish escape responses ABSTRACT Fish often evade predators with a fast-start escape response. Studies typically examine this behaviour in still water despite water motion being an inherent feature of aquatic ecosystems. In shallow habitats, waves create complex flows that likely influence escape performance, particularly in small fishes with low absolute swimming speeds relative to environmental flows. I examined how wave-driven water flow affects the behaviour and kinematics of escape responses in juveniles of three coral reef damselfishes (Pomacentridae) with different body morphologies. Tropical damselfishes have similar fin and body shapes during early development with the exception of body depth, a trait deemed important for postural control and stability. Wave-driven flow increased response latency in two of the three species tested: fish with a fusiform body responded 2.4 times slower in wave-driven flow than in still water, whereas this difference was less pronounced in fish with an intermediate body depth (1.9 times slower response), and absent in fish with a laterally compressed body. The effect of wave-driven flow on swimming performance (cumulative escape distance and turning rate) was variable and depended on the timing and trajectory of escape responses in relation to the wave phase. -
ABSTRACT the Bony Fins of Ray-Finned Fish Show Considerable
ABSTRACT The bony fins of ray-finned fish show considerable diversity in structure, and changes to the fin skeleton necessarily underlie adaptations to different swimming strategies and other functions. Many fish have fin rays that branch one or more times, and the presence, number and position of these branches are highly variant between species. Understanding the developmental processes that determine branch position can lead to a better understanding of how evolution has shaped fin diversity. This research program aims to use the fin ray skeleton to reveal fundamental mechanisms that allow bones to establish, remember and re-create their shapes. Further, since the functional significance of fin structure is incompletely understood, this research is integrated with an undergraduate training program that will address outstanding questions about the diversity, performance and evolution of fin ray structures and branching patterns. This course will reciprocally inform and enrich the overall research effort, and will mentor students from diverse backgrounds in answering research questions of their own design. This integrated research program is anticipated to provide a better understanding of fish fin development and adaptation; will yield insights into skeleton and limb development in other organisms, including humans, with likely relevance to regenerative medicine; and will help to prepare scientists at multiple educational levels for independent careers in science. This research uses zebrafish caudal fin rays to test a model by which proximo- distal positional identity is coordinated with fin outgrowth to specify ray morphology during both development and regeneration. Researchers will test a model in which a global endocrine factor coordinates proximate cellular and molecular processes known to underlie ray branching, further investigating the mechanisms by which positional information is stored and re-deployed during regeneration. -
Caracterización Del Riesgo Por Exposición a Metilmercurio Por Consumo No Intencional De Carne De Tiburón En Mujeres De México
MONOGRÁFICO 167 Caracterización del riesgo por exposición a metilmercurio por consumo no intencional de carne de tiburón en mujeres de México Caracterização do risco de exposição à metilmercurio do consumo não intencional de carne de tubarão em mulheres do México Characterization of the Risk of Exposure to Methylmercury Due to the Non- intentional Consumption of Shark Meat by Mexican Women Laura Elizalde-Ramírez, Patricia Ramírez-Romero, Guadalupe Reyes-Victoria, Edson Missael Flores-García Universidad Autónoma Metropolitana Iztapalapa, México. Cita: Elizalde-Ramírez L, Ramírez-Romero P, Reyes-Victoria G, Flores-García EM. Risk characterization of exposure to methylmercury due to non-intentional consumption of shark meat in females from Mexico. Rev. salud ambient. 2020; 20(2):167-178. Recibido: 27 de mayo de 2020. Aceptado: 10 de noviembre de 2020. Publicado: 15 de diciembre de 2020. Autor para correspondencia: Patricia Ramírez-Romero. Correo e: [email protected] Universidad Autónoma Metropolitana, México. Financiación: Proyecto “Indicadores de integridad ecológica y salud ambiental”, de la Universidad Autónoma Metropolitana de México, programa de posgrado en Energía y Medio Ambiente (PEMA) y el Consejo Nacional de Ciencia y Tecnología (CONACYT, México) a través del M. Sc. Beca No. 659582. Declaración de conflicto de intereses: Los autores declaran que no existen conflictos de intereses que hayan influido en la realización y la preparación de este trabajo. Declaraciones de autoría: Todos los autores contribuyeron al diseño del estudio y la redacción del artículo. Asimismo todos los autores aprobaron la versión final. Abstract Concern about the health risks due to the consumption of shark meat arose in two previous studies in which shark meat with high concentrations of methylmercury (MeHg) and fish meat with up to 60 % substitution with shark meat were documented. -
Part 4. on Histamine in Shark Meat
Title STUDIES ON SHARK MUSCLE:PART 4. ON HISTAMINE IN SHARK MEAT Author(s) OHOISHI, Keiichi Citation 北海道大學水産學部研究彙報, 4(2), 119-122 Issue Date 1953-08 Doc URL http://hdl.handle.net/2115/22801 Type bulletin (article) File Information 4(2)_P119-122.pdf Instructions for use Hokkaido University Collection of Scholarly and Academic Papers : HUSCAP STUDIES ON SHARK MUSCLE PART 4. ON HISTAMINE IN SHARK MEAT Keiichi OHOISHl (Faculty of Fisheries, Hokkaido University) Introduction Cases of poisoning by fish meat have been frequently reported the cause of which may be considered to be ptomaine, especially some amines. Actually several amines have been separated from putrefactive meat'P. Histamine is or.e of those amines; it is seriously toxic. On.e cause of the saying "mackerel stinks alive" may be the rapid decomposition of the meat; in the decomposed mackerel, meat the formation of histamine is used to recognized. The mechanism of the histamine formation in mackerel meat may be explained as follows: (1) Fresh fish meat indicates acidic reaction. (2) The decomposition of amino acids by bacteria in acidic medium is dominant in de carboxylation, so the amines corresponding to those amino acids are obtained'!). (3) A large amount of histidine is contained in the extractive matter of mackerel meat in comparison with other fish having white meat'S) . In accordance with the above three items, the mackerel meat, looking rather quite fresh, may contain a large amount of histamine, of which the quantity is enough to cause poison ing. The other hand. it has been already said that shark meat having a large amount of ammonia shows several features of good freshness except for developing ammonia(4).