World Book's Learning LaddersFishWORLDBOOKwww.worldbook.comWorld Book,Inc.180 North LaSalle StreetSuite 900USA2018 World Book,Inc.All rights reserved.This book may not be reproduced in whole or in port in any form withoutprior written permission from the publisher.WORLD BOOK and the GLOBE DEVICE are registered trademarks or trademarks of World Book,Inc.For information about other World Book publications,visit our website at www.worldbook.com or call1-800-W0 RLDBK(967-5325).For information about sales to schools and libraries,call 1-800-975-3250(United States);1-800-837-5365(Canada).Library of Congress Cataloging-in-Publication DataStaffExecutive CommitteeTitle:Tropical fish.President:Geoff BroderickDescription:Chicago,IL:World Book,Inc.,a Scott FetzerVice President,Finance:Donald D.Kellercompany,[2018]Vice President,Marketing:Jean LinSeries:World Book's learning ladders Includes index.Vice President,Technology:Jason DoleIdentifiers:LCCN 2017034924 ISBN 9780716679547Vice President,Customer Success:Jade LewandowskiSubjects:LCSH:Tropical fish--Juvenile literatureDirector,Editorial:Tom EvansClassification:LCC QL637.5 .T76 2018 DDCDirector,Human Resources:Bev Ecker597.17.-dc23LC record available at https://ccn.loc.gov/2017034924EditorialWriter:Kendra MuntzSenior Editor:Shawn BrennanManager,Indexing Services:David Pofelski1SBN978-0-7166-7945-5(set,hc.)Proofreader:Nathalie StrassheimDigitalI1SBN978-0-7166-7964-6(e-book)Director,Digital Product Development:Erika MellerDigital Product Manager:Jonathan WillsPrinted in China by Shanghai Zhonghua Printing CO.,LTD2nd printing April 2021Graphics and DesignCoordinator,Design Development and Production:Brenda TropinskiSenior Visual Communications Designer:Melanie J.BenderMedia Researcher:Rosalia BledsoePhotographic credits:Cover:Richard Whitcombe,Shutterstock:Architectof the Capitol:21;Dreamstime:22;Wild Horizons/UIG/Getty Imoges:8;iStockphoto:20;@Shutterstock:5,6,11,12,14,17,18,26,27.