Electro-fishing The Survey will use existing collection activities by cooperators to the fullest extent possible. Methods may include either active or passive collection methods. Each collection method has advantages and disadvantages which must be recognized. Study objectives, environmental characteristics, animal behavior, and size all have influences on sampling. For the purpose of this study, collection methods that accurately reflect the relative abundance of animals sampled and allow the investigator to obtain live specimens are preferred.
For these reasons, investigators should focus on active collection methods, such as, electrofishing, seines, trawls, and dredges. These sample methods define a more accurate sampling effort and are more likely to provide live or fresh samples. Care must be used when using passive collection, such as, gill nets, hoop nets, fyke nets, and rotary screw traps to ensure fresh samples suitable for fish health analysis.
Rotary Screw Trap However, since the study parameters are national in scope and include diverse aquatic habitats and cooperators, any collection method that gives a close approximation of the population for each habitat and provides opportunities for valid tissue collection will be considered.
Fish collection methods must be identified and documented by each investigator. Identification of collection method must be included in the database to enable valid comparison of health data collected.