DOCSLIB.ORG

Utilizing Magnetic Resonance Imaging (MRI) to Assess the Effects of Angling-Induced Barotrauma on Rockfish (Sebastes)

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Utilizing Magnetic Resonance Imaging (MRI) to Assess the Effects of Angling-Induced Barotrauma on Rockfish (Sebastes) 1245 RAPID COMMUNICATION / COMMUNICATION RAPIDE Utilizing magnetic resonance imaging (MRI) to assess the effects of angling-induced barotrauma on rockfish (Sebastes) Bonnie L. Rogers, Christopher G. Lowe, Esteban Ferna´ ndez-Juricic, and Lawrence R. Frank Abstract: The physical consequences of barotrauma on the economically important rockfish (Sebastes) were evaluated with a novel method using T2-weighted magnetic resonance imaging (MRI) in combination with image segmentation and analysis. For this pilot study, two fishes were captured on hook-and-line from 100 m, euthanized, and scanned in a 3 Tesla human MRI scanner. Analyses were made on each fish, one exhibiting swim bladder overinflation and exophthalmia and the other showing low to moderate swim bladder overinflation. Air space volumes in the body were quantified using image segmentation techniques that allow definition of individual anatomical regions in the three-dimensional MRIs. The individ- ual exhibiting the most severe signs of barotrauma revealed the first observation of a gas-filled orbital space behind the eyes, which was not observable by gross dissection. Severe exophthalmia resulted in extreme stretching of the optic nerves, which was clearly validated with dissections and not seen in the other individual. Expanding gas from swim blad- der overinflation must leak from the swim bladder, rupture the peritoneum, and enter the cranium. This MRI method of evaluating rockfish following rapid decompression is useful for quantifying the magnitude of internal barotrauma associ- ated with decompression and complementing studies on the effects of capture and discard mortality of rockfishes. Re´sume´ : Nous avons e´value´ les conse´quences physiques des barotraumatismes sur les se´bastes du genre Sebastes, des poissons d’importance e´conomique, a` l’aide d’une me´thode ine´dite utilisant l’imagerie par re´sonance magne´tique (MRI) ponde´re´eenT2 en combinaison avec la segmentation et l’analyse des images. Dans cette e´tude pilote, nous avons capture´ deux poissons a` la ligne a` une profondeur de 100 m et les avons euthanasie´s et analyse´s dans un scanner a` 3 teslas pour humains. Les analyses faites chez les deux poissons montrent, chez l’un, une inflation excessive de la vessie natatoire et une exophtalmie et, chez l’autre, une inflation excessive faible a` mode´re´e de la vessie natatoire. Nous avons mesure´ les volumes des espaces ae´riens dans le corps par des techniques de segmentation des images qui permettent une de´finition des diverses re´gions anatomiques en MRI 3D. L’individu qui pre´sente les symptoˆmes les plus importants de barotrauma- tisme posse`de un espace orbital rempli de gaz derrie`re les yeux qui n’est pas visible a` la dissection grossie`re. L’exoph- talmie se´ve`re cause un e´tirement extro˜me des nerfs optiques qui se ve´rifie clairement a` la dissection et qui n’est pas visible chez l’autre individu. Le gaz en expansion provenant de l’inflation excessive de la vessie natatoire doit s’e´chapper de la vessie, fendre le pe´ritoine et s’infiltrer dans le craˆne. Notre me´thode d’e´valuation des se´bastes par MRI apre`s une de´- compression rapide est utile pour mesurer l’importance du barotraumatisme interne associe´ a` la de´compression et elle sert de comple´ment aux e´tudes des effets de la capture et de la mortalite´ relie´ea` la remise a` l’eau chez les se´bastes. [Traduit par la Re´daction] groundfish. Many rockfish populations are declining as a Introduction result of high discard mortality and overexploitation (Davis 2002; Parker et al. 2006). High discard mortality of In the eastern Pacific, rockfish (Sebastes spp.) comprise physoclistic fishes has been attributed to barotrauma on the one of the most important and economically valuable fish resulting in swim bladder overinflation and rupture, Received 18 December 2007. Accepted 22 April 2008. Published on the NRC Research Press Web site at cjfas.nrc.ca on 15 May 2008. J20329 B.L. Rogers,1 C.G. Lowe, and E. Ferna´ndez-Juricic. Department of Biological Sciences, California State University Long Beach, 1250 Bellflower Boulevard, Long Beach, CA 90840, USA. L.R. Frank. Center for Scientific Computation in Imaging and Center for Functional MRI, University of California San Diego, La Jolla, CA 92037, USA. 1Corresponding author (e-mail: [email protected]). Can. J. Fish. Aquat. Sci. 65: 1245–1249 (2008) doi:10.1139/F08-102 # 2008 NRC Canada 1246 Can. J. Fish. Aquat. Sci. Vol. 65, 2008 exophthalmia (eye protrusion), and prolapsed stomach and swim bladder evident by an extremely swollen abdomen. (or) cloacae (Wilson and Burns 1996; Nichol and Chilton The greenblotched rockfish (fish with no visible trauma 2006; Hannah and Matteson 2007). The number and degree (fish NVT); 22 cm SL) showed little external signs of baro- of visible trauma symptoms in rockfish (Sebastes spp.) are trauma, no visible eye trauma, and an overinflated swim highly variable among individuals and species and not a bladder visible by a moderately swollen abdomen, although good predictor of survival (Jarvis and Lowe 2008). Knowl- this fish was also rapidly decompressed. Four hours after edge of internal damage associated with barotrauma is being caught, both fish were euthanized with an overdose limited, and more empirical evidence quantifying morpho- of tricaine methanesulfonate (MS 222) and placed one at a logical and physical damage is needed. Thus far, methods time inside a magnetic resonance imaging (MRI) unit for quantifying damage in rockfish have been limited purely to whole-body scanning. Photographs taken of the fish just visual inspection. after capture and again after MRI imagining indicated little In red snapper (Lutjanus campechnus), two-dimensional change in physical appearance. X rays revealed a pattern of increasing organ displacement Images were acquired on a 3 Tesla (3T) GE SIGNA clin- following decompression (Rummer and Bennett 2005), but ical imaging system using an eight-channel head array coil volumes were estimated by measuring organ dimensions, (MRI Devices, Waukesha, Wisconsin). Two data image sets which is subject to error. Magnetic resonance imaging were acquired for each specimen, a T1-weighted sequence (MRI), on the other hand, provides a fully three-dimensional and a T2-weighted sequence. Total imaging time was 2 h –1 (3D) digital image from which any fish organ dimension can for both fish (30 minÁscan ). The T1-weighted sequence of be measured accurately (in cubic millimetres). Although a fast RF-spoiled gradient recalled echo (FSPGR) produces X rays create contrast based on bone density, MRI has an high contrast between different tissue types, whereas the T2- advantage of visualizing and depicting soft tissues based weighted sequence was a steady-state free precession (SSFP) on water content. For example, T1-weighted MRI scanning method that produces high contrast between tissues and on the shortfin mako shark (Isurus oxyrinchus) and the fluids. The T2-weighted images produced better contrast salmon shark (Lamna ditropis) allowed quantification of near the eye regions and were the only scans used for the red muscle that provided precise and unique detail about image analyses in this study. the position, volume, and types of red muscle (Perry et al. Three-dimensional image segmentation and subsequent 2007). MRI methodology can reveal internal tissue and volume measurement of anatomical regions were performed organ placement, and displacement, immediately following using ITK-SNAP v.1.4.1 (Insight Segmentation and Regis- trauma and specifically display which areas are composed tration Toolkit) (www.itksnap.org/). Segmentation was per- of tissue or gas. formed in a semi-automated fashion whereby regions of The goals of this study using MRI were (i) to characterize interest were determined by an expert user who defined the morphological changes of the internal organs and ocular- points for the full 3D segmentation. A region-growing algo- orbital regions in rapidly decompressed rockfish using MRI rithm was then used to fill out the full organ volume com- techniques and (ii) to determine whether this technique posed of individual known volume units called voxels. MRI could be used as a diagnostic tool for assessing and charac- image segmentation is always limited by a well-known terizing internal injury resulting from fishing-related baro- effect called ‘‘partial voluming’’ that reduces the contrast at trauma. Because of the high cost of MRI operations, only tissue boundaries because multiple tissue types inhabit indi- two rockfish were surveyed as part of this ‘‘proof of con- vidual voxels. cept’’ study. We quantified the relative magnitude of differ- Both fish were dissected 2 h after scanning to reveal the ences between a fish exhibiting many signs of internal organ orientation and the orbital eye regions. All external barotrauma and one showing few signs. signs of barotrauma remained virtually unchanged from the time of capture to dissection, probably because fish were Materials and methods euthanized with MS-222 and placed in an ice bath during transport to prevent any further major physiological proc- Two rockfish, one honeycomb (Sebastes umbrosus) and esses from occurring after capture. The swim bladder and one greenblotched (Sebastes rosenblatti), were caught using internal organs were made visible by cutting away a section hook-and-line off the coast of Long Beach, California (Pot- of skin and muscle on the left side of each fish (Fig. 1). The ter’s Reef) from a depth of 100 m at seafloor, euthanized, eye orbits and optic nerves were made visible by cutting and transported in an ice-bath slurry to the MRI facility. away the frontal cranial bone and clearing away all sur- The two species have very similar body morphologies, be- rounding tissue. Optic nerve lengths were measured using long to overlapping and homologous ecotypes, and inhabit digital calipers.
Load more

Recommended publications
  • 500 Natural Sciences and Mathematics
    500 500 Natural sciences and mathematics Natural sciences: sciences that deal with matter and energy, or with objects and processes observable in nature Class here interdisciplinary works on natural and applied sciences Class natural history in 508. Class scientific principles of a subject with the subject, plus notation 01 from Table 1, e.g., scientific principles of photography 770.1 For government policy on science, see 338.9; for applied sciences, see 600 See Manual at 231.7 vs. 213, 500, 576.8; also at 338.9 vs. 352.7, 500; also at 500 vs. 001 SUMMARY 500.2–.8 [Physical sciences, space sciences, groups of people] 501–509 Standard subdivisions and natural history 510 Mathematics 520 Astronomy and allied sciences 530 Physics 540 Chemistry and allied sciences 550 Earth sciences 560 Paleontology 570 Biology 580 Plants 590 Animals .2 Physical sciences For astronomy and allied sciences, see 520; for physics, see 530; for chemistry and allied sciences, see 540; for earth sciences, see 550 .5 Space sciences For astronomy, see 520; for earth sciences in other worlds, see 550. For space sciences aspects of a specific subject, see the subject, plus notation 091 from Table 1, e.g., chemical reactions in space 541.390919 See Manual at 520 vs. 500.5, 523.1, 530.1, 919.9 .8 Groups of people Add to base number 500.8 the numbers following —08 in notation 081–089 from Table 1, e.g., women in science 500.82 501 Philosophy and theory Class scientific method as a general research technique in 001.4; class scientific method applied in the natural sciences in 507.2 502 Miscellany 577 502 Dewey Decimal Classification 502 .8 Auxiliary techniques and procedures; apparatus, equipment, materials Including microscopy; microscopes; interdisciplinary works on microscopy Class stereology with compound microscopes, stereology with electron microscopes in 502; class interdisciplinary works on photomicrography in 778.3 For manufacture of microscopes, see 681.
    [Show full text]
  • Introduction
    INTRODUCTION In nearly every body of water around the world, the most abundant vertebrate is a fi sh. From the deepest parts of the ocean to high alpine streams, fi shes live and reproduce, sometimes in places where no other vertebrates can survive. Whether peering out from a submarine while conducting deep-sea research, or stopping for a drink of water during a hike in the mountains, explorers, scientists, and naturalists fi nd fi shes. With well over 30,000 species, fi shes account for more than half of the total extant vertebrate diversity on Earth— in other words, there are more living species of fi shes than of amphibians, turtles, lizards, birds, and mammals combined. Not only are fi shes diverse in number of their species, but they are diverse in the habitats in which they live, the foods that they eat, the ways in which they reproduce, communicate, and interact with their environment, and the behaviors that they exhibit. Fishes can also be extremely abundant: the most abundant vertebrates on the planet are the small bristlemouth fi shes (Gonostomatidae) that are common throughout the vast open ocean. In some cases abundant fi shes such as cods, tunas, salmons, herrings, and anchovies support massive fi sheries that feed hundreds of millions of people. By supporting coastal communities and societies, these fi sheries (and the fi shes they target) have helped shape human history, becoming the foundation for coastal economies and an engine for global exploration and expansion. WHAT IS A FISH? Humans use the term “fi sh” to refer to several groups of vertebrates that do not have a clear set of diagnostic characteristics unique to them.
    [Show full text]
  • Esox Lucius) Ecological Risk Screening Summary
    Northern Pike (Esox lucius) Ecological Risk Screening Summary U.S. Fish & Wildlife Service, February 2019 Web Version, 8/26/2019 Photo: Ryan Hagerty/USFWS. Public Domain – Government Work. Available: https://digitalmedia.fws.gov/digital/collection/natdiglib/id/26990/rec/22. (February 1, 2019). 1 Native Range and Status in the United States Native Range From Froese and Pauly (2019a): “Circumpolar in fresh water. North America: Atlantic, Arctic, Pacific, Great Lakes, and Mississippi River basins from Labrador to Alaska and south to Pennsylvania and Nebraska, USA [Page and Burr 2011]. Eurasia: Caspian, Black, Baltic, White, Barents, Arctic, North and Aral Seas and Atlantic basins, southwest to Adour drainage; Mediterranean basin in Rhône drainage and northern Italy. Widely distributed in central Asia and Siberia easward [sic] to Anadyr drainage (Bering Sea basin). Historically absent from Iberian Peninsula, Mediterranean France, central Italy, southern and western Greece, eastern Adriatic basin, Iceland, western Norway and northern Scotland.” Froese and Pauly (2019a) list Esox lucius as native in Armenia, Azerbaijan, China, Georgia, Iran, Kazakhstan, Mongolia, Turkey, Turkmenistan, Uzbekistan, Albania, Austria, Belgium, Bosnia Herzegovina, Bulgaria, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Macedonia, Moldova, Monaco, 1 Netherlands, Norway, Poland, Romania, Russia, Serbia, Slovakia, Slovenia, Sweden, Switzerland, United Kingdom, Ukraine, Canada, and the United States (including Alaska). From Froese and Pauly (2019a): “Occurs in Erqishi river and Ulungur lake [in China].” “Known from the Selenge drainage [in Mongolia] [Kottelat 2006].” “[In Turkey:] Known from the European Black Sea watersheds, Anatolian Black Sea watersheds, Central and Western Anatolian lake watersheds, and Gulf watersheds (Firat Nehri, Dicle Nehri).
    [Show full text]
  • Systematic Morphology of Fishes in the Early 21St Century
    Copeia 103, No. 4, 2015, 858–873 When Tradition Meets Technology: Systematic Morphology of Fishes in the Early 21st Century Eric J. Hilton1, Nalani K. Schnell2, and Peter Konstantinidis1 Many of the primary groups of fishes currently recognized have been established through an iterative process of anatomical study and comparison of fishes that has spanned a time period approaching 500 years. In this paper we give a brief history of the systematic morphology of fishes, focusing on some of the individuals and their works from which we derive our own inspiration. We further discuss what is possible at this point in history in the anatomical study of fishes and speculate on the future of morphology used in the systematics of fishes. Beyond the collection of facts about the anatomy of fishes, morphology remains extremely relevant in the age of molecular data for at least three broad reasons: 1) new techniques for the preparation of specimens allow new data sources to be broadly compared; 2) past morphological analyses, as well as new ideas about interrelationships of fishes (based on both morphological and molecular data) provide rich sources of hypotheses to test with new morphological investigations; and 3) the use of morphological data is not limited to understanding phylogeny and evolution of fishes, but rather is of broad utility to understanding the general biology (including phenotypic adaptation, evolution, ecology, and conservation biology) of fishes. Although in some ways morphology struggles to compete with the lure of molecular data for systematic research, we see the anatomical study of fishes entering into a new and exciting phase of its history because of recent technological and methodological innovations.
    [Show full text]
  • MERCURY CONCENTRATIONS in FISH from the GUADALUPE RIVER, TEXAS: RELATIONSHIPS with BODY LENGTH and TROPHIC POSITION by Taylor Re
    MERCURY CONCENTRATIONS IN FISH FROM THE GUADALUPE RIVER, TEXAS: RELATIONSHIPS WITH BODY LENGTH AND TROPHIC POSITION by Taylor Rene Gold Quiros, B.S. A thesis submitted to the Graduate Council of Texas State University in partial fulfillment of the requirements for the degree of Master of Science with a Major in Aquatic Resources December 2018 Committee Members: Jessica Dutton, Chair Tim Bonner Weston Nowlin Clint Robertson COPYRIGHT by Taylor Rene Gold Quiros 2018 FAIR USE AND AUTHOR’S PERMISSION STATEMENT Fair Use This work is protected by the Copyright Laws of the United States (Public Law 94-553, section 107). Consistent with fair use as defined in the Copyright Laws, brief quotations from this material are allowed with proper acknowledgement. Use of this material for financial gain without the author’s express written permission is not allowed. Duplication Permission As the copyright holder of this work I, Taylor Rene Gold Quiros, authorize duplication of this work, in whole or in part, for educational or scholarly purposes only. DEDICATION My Toby. Te amo. I miss you ACKNOWLEDGEMENTS I would first like to thank my thesis advisor Dr. Jessica Dutton; her office was always open whenever I ran into a trouble spot or had a question about my research or writing. Dr. Tim Bonner and Dr. Weston Nowlin were incredibly helpful in teaching me how to think like a scientist and their patience with my questions was without end. Gratitude is also due to Clint Robertson, without whom I wouldn’t have fish to analyze in the first place nor would I know the differences between those pesky sunfish.
    [Show full text]
  • Integrated Mariculture a Global Review. FAO Fisheries And
    ISSN 2070-7010 529 FAO FISHERIES AND AQUACULTURE TECHNICAL PAPER 529 Integrated mariculture A global review Integrated mariculture – A global review global A – mariculture Integrated This technical paper provides a comprehensive review of current integrated mariculture practices around the world in three papers covering temperate zones, tropical zones and one semi enclosed ecosystem, the Mediterranean Sea. Integrated mariculture includes a diverse range of co-culture/farming practices, from integrated multitrophic aquaculture to the more specialized integration of mangrove planting with aquaculture, called aquasilviculture. Modern integrated mariculture systems must be developed in order to assist sustainable expansion of the sector in coastal and marine ecosystems thus responding to the global increase for seafood demand but with a new paradigm of more efficient food production systems. Successful integrated mariculture operations must consider all relevant stakeholders into its development plan, there is also a need to facilitate commercialization and promote effective legislation for the support and inclusion of integrated mariculture through adequate incentives particularly considering the reduction of environmental costs associated to monoculture farming. Bioremediation of fed aquaculture impacts through integrated mariculture is a core benefit but the increase of production, more diverse and secure business and larger profits should not be underestimated as additional advantages. ISBN 978-92-5-106387-3 ISSN 2070-7010 978 9 2 5 1 0
    [Show full text]
  • Hydrodynamics of Suction Feeding in Fish
    HYDRODYNAMICS OF SUCTION FEEDING IN FISH CENTRALE LANDBOUWCATALOGUS 0000 0086 6232 Promotor: dr. J. W. M. Osse, hoogleraar in de algemene dierkunde. Co-promotor: ir. J. H. G. Verhagen, docent m.b.t. de analyse van aquatische systemen. *JfJC'c--'-V p ^S MEES MULLER HYDRODYNAMICS OF SUCTION FEEDING IN FISH Proefschrift ter verkrijging van degraa d van doctor ind e landbouwwetenschappen, op gezagva n de rector magnificus, dr. C. C.Oosterlee , hoogleraar ind eveeteeltwetenschap , in het openbaar teverdedige n opwoensda g 29jun i 1983 desnamiddag st ehal fdri ei nd eaul a van de Landbouwhogeschool te Wageningen. H.VEENMA N & ZONEN B.V.- WAGENINGE N -198 3 1^ /Sb133-0 3 vt JC w STELLINGEN. 1. In unsteady flow it is impossible to deduce the velocity of the water from the pressure. Therefore, Lauder's proposal for a model of suction feeding in fish is not valid. Contra: Lauder (1980a, b) 2. Theexperimenta l approach to determine thefunctio n ofa structure by removing or severing important parts of this system as done by Liem (1970) and Lauder (1979) is comparable to the old story of studying the locomotion of the rat by successively cutting its legs. For example: Fig. 2F, p. 547 in Lauder (1979) is comparable with the case of the rat havingjus t only one leg remained. This crude information does not contribute to any insight in functional mor­ phology of fish. Contra: Liem (1970), Lauder (1979) 3. Theconclusion , based on EMG-results ofrecen t fish, that them . adductor oper- culi in the extinct palaeoniscoids should have a biphasic activity during feeding (Lauder, 1980c) is as unscientific as e.g.
    [Show full text]
  • Fishes of the World
    Fishes of the World Fishes of the World Fifth Edition Joseph S. Nelson Terry C. Grande Mark V. H. Wilson Cover image: Mark V. H. Wilson Cover design: Wiley This book is printed on acid-free paper. Copyright © 2016 by John Wiley & Sons, Inc. All rights reserved. Published by John Wiley & Sons, Inc., Hoboken, New Jersey. Published simultaneously in Canada. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning, or otherwise, except as permitted under Section 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 646-8600, or on the web at www.copyright.com. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, (201) 748-6011, fax (201) 748-6008, or online at www.wiley.com/go/permissions. Limit of Liability/Disclaimer of Warranty: While the publisher and author have used their best efforts in preparing this book, they make no representations or warranties with the respect to the accuracy or completeness of the contents of this book and specifically disclaim any implied warranties of merchantability or fitness for a particular purpose. No warranty may be createdor extended by sales representatives or written sales materials. The advice and strategies contained herein may not be suitable for your situation.
    [Show full text]
  • DNA Transposon Expansion Is Associated with Genome Size
    bioRxiv preprint doi: https://doi.org/10.1101/2021.06.07.447207; this version posted June 7, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 1 DNA transposon expansion is 2 associated with genome size increase 3 in mudminnows 4 5 Robert Lehmann1, Aleš Kovařík2, Konrad Ocalewicz3, Lech Kirtiklis4, 6 Andrea Zuccolo5,6, Jesper N. Tegner1, Josef Wanzenböck7, Louis 7 Bernatchez8, DunJa K. Lamatsch7, and Radka Symonová9,10 8 9 1 Division of Biological and Environmental Sciences & Engineering, 10 Computer, Electrical and Mathematical Sciences and Engineering Division, 11 King Abdullah University of Science and Technology, Thuwal, 23955-6900, 12 Kingdom of Saudi Arabia 13 2 Laboratory of Molecular Epigenetics, Institute of Biophysics, Czech 14 Academy of Science, Královopolská 135, 61265, Brno, Czech Republic 15 3 Department of Marine Biology and Ecology, Institute of Oceanography, 16 Faculty of Oceanography and Geography, University of Gdansk, Gdansk, 17 Poland 18 4 Department of Zoology, Faculty of Biology and Biotechnology, University 19 of Warmia and Mazury, M. Oczapowskiego Str. 5, 10-718, Olsztyn, Poland 20 5 Center for Desert Agriculture, Biological and Environmental Sciences & 21 Engineering Division (BESE), King Abdullah University of Science and 22 Technology, Thuwal 23955-6900, Saudi Arabia 23 6 Institute of Life Sciences, Scuola Superiore
    [Show full text]
  • Angling-Induced Injuries Have a Negative Impact on Suction Feeding
    © 2018. Published by The Company of Biologists Ltd | Journal of Experimental Biology (2018) 221, jeb180935. doi:10.1242/jeb.180935 RESEARCH ARTICLE Angling-induced injuries have a negative impact on suction feeding performance and hydrodynamics in marine shiner perch, Cymatogaster aggregata Melissa Thompson1, Sam Van Wassenbergh2,3, Sean M. Rogers4, Scott G. Seamone4 and Timothy E. Higham5,* ABSTRACT and Cooke, 2008). Declining fish biodiversity and stocks highlight Fishing is a popular and lucrative sport around the world and, in the importance of fishing regulations and catch-and-release some cases, may contribute to declining fish stocks. To mediate this programmes (Lewin et al., 2006). Catch-and-release involves problem and maintain fish biomass in aquatic ecosystems, catch- recreational anglers catching and then quickly releasing a fish and-release fishing, whereby a fish is caught and immediately back into the water to help preserve the fish biomass, while still released, has been implemented in many countries. It is unclear enabling the continuation of fishing practices (Pollock and Pine, whether the injuries to the mouth that are caused by the hook have an 2007). Catch-and-release was initially thought to have a very impact on feeding performance of fishes. Using high-speed video and minimal impact on fish populations given that anglers were not computational fluid dynamics (CFD), we asked whether injuries removing fish from the habitat (Bugley and Shepherd, 1991). around the mouth caused by fishing hooks have a negative impact on However, average post-release mortality can be as high as 67% due suction feeding performance (measured as maximum prey velocity) to the stresses from catch-and-release, raising questions about the of the commonly angled marine shiner perch (Cymatogaster efficacy of this fishing method (Bettoli and Osborne, 1998).
    [Show full text]
  • Sharks, Skates, and Rays: the Biology of Elasmobranch Fishes
    Sharks, Skates, And Rays: The Biology Of Elasmobranch Fishes If searched for the ebook Sharks, Skates, and Rays: The Biology of Elasmobranch Fishes in pdf form, then you have come on to the loyal site. We presented utter variant of this book in doc, DjVu, PDF, txt, ePub forms. You may read Sharks, Skates, and Rays: The Biology of Elasmobranch Fishes online either load. Withal, on our site you can read guides and another artistic eBooks online, or downloading them. We like to draw your consideration that our website not store the book itself, but we give reference to the website where you can downloading or reading online. If you have necessity to downloading Sharks, Skates, and Rays: The Biology of Elasmobranch Fishes pdf, then you have come on to the correct site. We have Sharks, Skates, and Rays: The Biology of Elasmobranch Fishes doc, PDF, ePub, txt, DjVu formats. We will be glad if you go back more. blue zoo: skates and rays | one world one ocean - Blue Zoo: Skates and Rays. Sarah Bedolfe | February 21 2013. Featuring one amazing marine animal per week. Skates and rays are fish that are closely related to sharks. elasmobranchs - About 400 species of shark and 500 species of skates and rays have cartilaginous fish in the sea but are is known about their biology. Elasmobranch ebook without registration william c hamlett fb2 - You are here Home Ebook Without Registration William C Hamlett FB2 Sharks Skates and Rays The Biology of Elasmobranch Fishes amazon.com: customer reviews: sharks, skates, and - Find helpful customer reviews and review ratings for Sharks, Skates, and Rays: The Biology of Elasmobranch Fishes at Amazon.com.
    [Show full text]
  • Fisheries of the United States 2015 Current Fishery Statistics No
    Fisheries of the United States 2015 Current Fishery Statistics No. 2015 National Marine Fisheries Service Office of Science and Technology Fisheries Statistics Division David Van Voorhees, Chief Alan Lowther & Michael Liddel, Editors Silver Spring, MD September 2016 U.S. Department of National Oceanic National Marine Commerce and Atmospheric Fisheries Service Administration Penny Pritzker Kathryn D. Sullivan, Ph.D. Eileen Sobeck Secretary of Commerce Under Secretary of Assistant Administrator for Commerce for Oceans and Fisheries Atmosphere FUS2015 Fv6 ii FUS 2015 Preface FISHERIES OF THE UNITED STATES, 2015 Oregon, Washington, and Alaska. We also wish to This publication is the annual National Marine thank Stefania Vannuccini and Gabriella Laurenti Fisheries Service (NMFS) yearbook of fishery sta- of the Food and Agriculture Organization of the tistics for the United States for 2015. The report United Nations, and Brad McHale, Jackie Johnson- provides data on U.S. recreational catch and com- Cragg, and Dianne Stephan of the NOAA Office mercial fisheries landings and value as well as other of Sustainable Fisheries. aspects of U.S. commercial fishing. In addition, data NOTES are reported on the U.S. fishery processing industry, As in past issues of this publication, the units of imports and exports of fishery-related products, quantity and value are defined as follows unless and domestic supply and per capita consumption otherwise noted: U.S. landings are shown in round of fishery products. weight (except mollusks which are in meat weight); SOURCES OF DATA quantities shown for U.S. imports and exports are Information in this report came from many sources. in product weight, as reported by the U.S.
    [Show full text]