Diseases of Carp and Other Cyprinid Fishes
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Diseases of Carp and Other Cyprinid Fishes D. Hoole Senior Lecturer, School of Life Sciences, Keele University, UK D. Bucke Consultant, DB Aquatic Pathology Services, Weymouth, Dorset, UK P. Burgess Aquatic Consultant, London, UK and I. Wellby Lecturer in Fishery Studies, Brooksby College, Leicestershire, UK Diseases of Carp and Other Cyprinid Fishes Diseases of Carp and Other Cyprinid Fishes D. Hoole Senior Lecturer, School of Life Sciences, Keele University, UK D. Bucke Consultant, DB Aquatic Pathology Services, Weymouth, Dorset, UK P. Burgess Aquatic Consultant, London, UK and I. Wellby Lecturer in Fishery Studies, Brooksby College, Leicestershire, UK Copyright © 2001 DISTRIBUTORS Marston Book Services Ltd Fishing News Books PO Box 269 A division of Blackwell Science Ltd Abingdon Editorial Offi ces: Oxon OX14 4YN Osney Mead, Oxford OX2 0EL (Orders: Tel: 01865 206206 25 John Street, London WC1N 2BS Fax: 01865 721205 23 Ainslie Place, Edinburgh EH3 6AJ Telex: 83355 MEDBOK G) 350 Main Street, Malden MA 02148 5018, USA USA and Canada 54 University Street, Carlton Iowa State University Press Victoria 3053, Australia A Blackwell Science Company 10, rue Casimir Delavigne 2121 S. State Avenue 75006 Paris, France Ames, Iowa 50014-8300 (Orders: Tel: 800-862-6657 Other Editorial Offi ces: Fax: 515-292-3348 Web www.isupress.com Blackwell Wissenschafts-Verlag GmbH email: [email protected] Kurfürstendamm 57 10707 Berlin, Germany Australia Blackwell Science Pty Ltd Blackwell Science KK 54 University Street MG Kodenmacho Building Carlton, Victoria 3053 7–10 Kodenmacho Nihombashi (Orders: Tel: 03 9347 0300 Chuo-ku, Tokyo 104, Japan Fax: 03 9347 5001) Iowa State University Press A catalogue record for this title A Blackwell Science Company is available from the British Library 2121 S. State Avenue Ames, Iowa 50014-8300, USA ISBN 0-85238-252-9 The right of the Author to be identifi ed Library of Congress as the Author of this Work has been asserted Cataloging-in-Publication Data in accordance with the Copyright, Designs is available and Patents Act 1988. For further information on All rights reserved. No part of Fishing News Books, visit our website: this publication may be reproduced, http://www.blacksci.co.uk/fnb/ stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, except as permitted by the UK Copyright, Designs and Patents Act 1988, without the prior permission of the publisher. First published 2001 Set in 10.5/12 pt Palatino by Sparks Computer Solutions Ltd, Oxford http://www.sparks.co.uk Printed and bound in Great Britain by MPG Books Ltd, Bodmin, Cornwall The Blackwell Science logo is a trade mark of Blackwell Science Ltd, registered at the United Kingdom Trade Marks Registry Contents Acknowledgements xi Preface xiii 1 Introduction 1 1.1 Geographical distribution 1 1.2 Economic importance of cyprinids 3 Further reading 7 2 Cyprinid Biology 8 2.1 Water: the controlling factor 8 2.2 Basic external anatomy 9 2.3 Basic internal anatomy 11 2.3.1 Skeletal and muscular systems 11 2.3.2 Digestive system 12 2.3.3 Excretory system 14 2.3.4 Reproductive system and life cycle 14 2.3.5 Endocrine system 16 2.3.6 Nervous and sensory systems 16 2.3.7 Cardiovascular system and blood 17 2.3.8 Immune system 18 Further reading 20 3 Disease Symptoms 21 3.1 Behavioural symptoms of disease 22 3.2 General external visual signs 23 3.2.1 Colour changes 23 3.2.2 Skeletal deformities 23 3.2.3 Abdominal swellings 23 3.2.4 Emaciation 26 3.2.5 Abnormal swimming activity 26 3.2.6 The skin 26 3.2.7 The gills 30 3.3 Internal signs of disease 30 3.3.1 The digestive tract 30 3.3.2 The liver 31 3.3.3 The pancreas 32 3.3.4 The kidney 32 3.3.5 The gonads 33 3.3.6 The thyroid gland 35 vi Contents 3.3.7 Skeletal or bony tissues 35 3.3.8 Smooth muscle tissues 35 3.3.9 The striated or skeletal muscle 36 3.3.10 The swimbladder 36 3.3.11 The heart 37 3.3.12 Blood vessels and cells 37 3.3.13 The spleen 38 3.3.14 The thymus 38 3.3.15 The brain 39 3.3.16 The spinal cord 39 3.3.17 Peripheral nerves 39 3.3.18 The eye 40 3.3.19 The olfactory organ 41 3.3.20 The lateral line system 41 3.3.21 Taste buds 41 3.3.22 The barbels 41 Further reading 42 4 Infectious Diseases – Viruses, Bacteria and Fungi 43 4.1 Viral pathogens and diseases 43 4.1.1 Spring viraemia of carp (SVC) 44 4.1.2 Grass carp haemorrhagic disease (GCHD) 47 4.1.3 Fish pox 47 4.1.4 Emerging viral diseases 48 4.2 Bacterial pathogens and diseases 50 4.2.1 Flexibacter 51 4.2.2 Aeromonads and pseudomonads 53 4.2.3 Mycobacteriosis 55 4.2.4 Edwardsiella spp. 56 4.2.5 Proteus rettgeri 56 4.2.6 Emerging bacterial pathogens 56 4.3 Fungal pathogens and diseases 57 4.3.1 Clinical signs and diagnosis 57 4.3.2 Prevention and control 57 4.4 Zoonoses 58 4.4.1 Bacterial zoonoses 58 4.4.2 Viral and fungal zoonoses 60 Further reading 60 5 Infectious Diseases – Parasites 63 5.1 Protozoan parasites and diseases 63 5.1.1 Mastigophora (fl agellates) 64 5.1.2 Rhizopoda (amoebae) 67 5.1.3 Ciliophora (ciliates) 67 5.1.4 Apicomplexa 73 5.1.5 Myxozoa (Myxosporea) 74 5.1.6 Microspora (Microsporidia) 77 5.1.7 Protozoan parasites of uncertain taxonomy 78 5.2 Monogenean fl ukes 79 Contents vii 5.2.1 Dactylogyridae 80 5.2.2 Gyrodactylidae 82 5.2.3 Polyopisthocotylida 82 5.3 Digenean fl ukes (trematodes) 83 5.3.1 Digenean fl ukes with fi sh as the defi nitive host 85 5.3.2 Digenean fl ukes with fi sh as an intermediate host 88 5.4 Cestodes (the tapeworms) 92 5.4.1 Cyprinids as defi nitive hosts 93 5.4.2 Cyprinids as intermediate hosts 102 5.5 Nematodes 105 5.6 Acanthocephalans (spiny headed worms) 106 5.6.1 Pomphorhynchus laevis 106 5.7 Mollusca (Glochidia) 108 5.8 Annelid worms (leeches) 108 5.9 Crustacea 110 5.9.1 Argulus foliaceus 112 5.9.2 Ergasilus sieboldi 115 5.9.3 Lernaea cyprinacea 116 5.10 Zoonoses 118 5.10.1 Trematodes 119 5.10.2 Nematodes 121 Acknowledgement 122 Further reading 122 6 Noninfectious diseases 125 6.1 Self-infl icted injuries 125 6.1.1 Injuries and deaths due to jumping (escape responses) 126 6.2 Injuries caused by fi sh and other animals 126 6.2.1 Injuries caused by con-specifi cs and other cyprinids 127 6.2.2 Injuries caused by noncyprinid fi sh 127 6.2.3 Cannibalism 128 6.2.4 Injuries caused by species other than fi sh 128 6.3 Injuries caused by human activities 131 6.3.1 Aquaculture practices 131 6.3.2 Angling 132 6.3.3 Scientifi c research 133 6.4 Developmental and physiological diseases 133 6.5 Common disease problems 134 6.5.1 Swimbladder disorders 134 6.5.2 Noninfectious dropsy 135 6.6 Sterility 135 6.6.1 Hybridisation 135 6.7 Tumours 136 6.7.1 Papilloma 137 6.7.2 Squamous cell carcinoma 139 6.7.3 Adenoma of the thyroid 140 viii Contents 6.7.4 Adenoma of the kidney 140 6.7.5 Nonhaemopoietic mesenchymal tumours 141 6.7.6 Haematopoietic tumours 141 6.7.7 Pigment cell tumours 142 6.7.8 Nervous tissue tumours 143 6.7.9 Miscellaneous tumours 143 6.8 Longevity and senile-related diseases 143 Further reading 144 7 Environmentally Induced Diseases 147 7.1 Environmental diseases caused by natural events 147 7.2 Environmental diseases caused by human activities 148 7.3 Water temperature 149 7.3.1 High temperatures 150 7.3.2 Low temperatures 151 7.4 Dissolved gases 151 7.4.1 O x yge n 151 7.4.2 Gas supersaturation 152 7.5 pH 154 7.5.1 Excessively low pH 155 7.5.2 Excessively high pH 155 7.5.3 Adjusting pH 156 7.6 Nitrogenous wastes 156 7.6.1 Ammonia 156 7.6.2 Nitrite 157 7.6.3 Nitrate 158 7.7 Other pollutants 158 7.7.1 Heav y me t a l s 158 7.7.2 Pe st ic ide s 159 7.7.3 Endocrine disrupting chemicals 159 7.8 Environmental stressors and disease 160 7.9 Measurement of some environmental water parameters 161 Further reading 161 8 Nutritionally Induced Diseases 163 8.1 Natural foods 163 8.2 Artifi cial foods 164 8.3 Nutrition related diseases 164 8.3.1 Vitamin defi ciency disorders 164 8.3.2 Amino acid defi ciencies 165 8.3.3 Mineral defi ciencies 167 8.3.4 Fatty acid imbalances 167 8.4 Starvation 167 8.5 Nutritional toxicity disorders 168 8.5.1 Mycotoxins 169 8.6 Overfeeding 169 8.6.1 Winter bait foods 169 8.7 Diseases associated with live food organisms 170 Contents ix 8.8 Diseases associated with feeding sick or dead fi sh 170 Further reading 171 9 Diseases of Eggs and Fry 172 9.1 Eggs 172 9.1.1 Infertile eggs 172 9.1.2 Hatching failure in fertile eggs 172 9.1.3 Infectious diseases 173 9.1.4 Parental care as a means of reducing egg infections 174 9.1.5 Parental care and increased egg survival 174 9.2 Fry 175 9.2.1 Immunity and infectious diseases 175 9.2.2 Gas bubble disease 175 9.3 Predation of eggs and fry 176 Further reading 176 10 Management of Fish Health 177 10.1 Introduction to site management plans 178 10.1.1 Prevention 179 10.1.2 Husbandry 182 10.1.3 Therapeutic measures 185 10.2 Trade organisations and other bodies 190 Further reading 191 11 Future Developments 192 11.1 Rapid diagnostic methods 193 11.1.1 Antibody detection assays 193 11.1.2 Antigen detection assays 193 11.1.3 Genetic screening technology 194 11.2 Vaccine development 194 11.3 Trends in chemotherapy 198 11.4 Future disease risks 198 Further reading 200 12 Laboratory Procedures in Disease Diagnosis and Control 201 12.1 Examination on site 201 12.2 Submitting a sample to the laboratory 203 12.3 Initial examination 203 12.4 Euthanasia 205 12.5 Detailed external examination 205 12.5.1 External bacteriology sampling 206 12.6 Blood sampling 206 12.7 Detailed internal examination 207 12.7.1 Heart removal and examination 207 12.7.2 Internal bacteriology sampling 207 12.7.3 Visceral organs 209 12.7.4 Intestine 209 12.7.5 Gills 209 x Contents 12.7.6 Eyes and nasal cavity 210 12.7.7 Brain 210 12.8 Laboratory tests 210 12.8.1 Parasitology 210 12.8.2 Bacteriology 212 12.8.3 Serology 212 12.8.4 Virology 213 12.8.5 Histology 214 12.9 Diagnosis 216 12.10 Post mortem equipment 217 Further reading 218 Fish Names Cited in Text 221 Glossary of Terms 225 Index 253 Acknowledgements The authors wish to thank all those who have provided information and constructive comments during the production of this book.