This handbook is a reference guide for data on freshwater fish. It includes tabular material frequently needed by conservationists and biologists, and serves as a bibliographical guide for research workers. The author acknowledges contributions from various individuals and organizations for their data. The handbook covers various aspects of freshwater fish biology, including lengths, ages, growth rates, weight relationships, condition indexes, fecundity, and life histories. It provides conversion tables, literature citations, and an index. The handbook also includes detailed information on the growth and life history of various freshwater fish species, along with data on their size, weight, and other biological characteristics. The data are presented in tables and include information on the growth rates, age determination methods, and length-weight relationships for various species. The handbook also includes information on the fecundity of various fish species, as well as data on the age and growth of fish in different environments. The handbook is a comprehensive resource for fishery biologists and researchers, providing a detailed overview of the biology and ecology of freshwater fish species.This handbook is a reference guide for data on freshwater fish. It includes tabular material frequently needed by conservationists and biologists, and serves as a bibliographical guide for research workers. The author acknowledges contributions from various individuals and organizations for their data. The handbook covers various aspects of freshwater fish biology, including lengths, ages, growth rates, weight relationships, condition indexes, fecundity, and life histories. It provides conversion tables, literature citations, and an index. The handbook also includes detailed information on the growth and life history of various freshwater fish species, along with data on their size, weight, and other biological characteristics. The data are presented in tables and include information on the growth rates, age determination methods, and length-weight relationships for various species. The handbook also includes information on the fecundity of various fish species, as well as data on the age and growth of fish in different environments. The handbook is a comprehensive resource for fishery biologists and researchers, providing a detailed overview of the biology and ecology of freshwater fish species.