Fish science is called ichthyology. This book does not cover all the issues that ichthyologists deal with. It will only introduce you to the most wonderful fish, tell you about the lifestyle they lead, how their various organs are arranged and how the "relationship" between man and fish has developed over the centuries. And if this book helps you learn something about the life of the inhabitants of the underwater world, if you read it with interest and benefit for yourself, the author will consider his task completed.