The first edition of Tropical Fish has the letters ABCDE on page 160. Copyright © 1975 by Western Publishing Company, Inc. Published by Golden Press, New York, N.Y. Cover price is $1.95. The number on the spine is 24361. ISBN 0-307-24361-3 on the back cover.
The only cover change to Tropical Fish is shown next. Copyright © 1987, 1975 by Western Publishing Company, Inc. No price listed. ISBN 0-307-24361-3 on the back cover. My copy has the letters QRSTUV on page 160.
Image #1 was published in a large (5 ¼ by 7 ¾ inch) hardcover. ISBN number 0-307-64361-1 on the back cover.
No revised edition exists that I am aware of. Still in print by St. Martin's Press.