Look in an encyclopedia or similar basic source to get background information on salmon. Make a list of terms, such as common names, species names, and perhaps some special terms like "parr." These terms can help you later in a search for journal articles or Web sites. For online help with common and scientific names, consult FishBase. For help with definitions of unfamiliar terms, try one of our zoology or ecology dictionaries.
Grzimek's Animal Life Encyclopedia by 
McGraw-Hill Encyclopedia of Science and Technology by 