1. Introduction to aquatic ecological research (wild behavior, habitat use and environment-response relationship, etc.), the traditional methods used mainly fishing, mark-recapture and laboratory observations and other methods to achieve, but there is a big limitation of these means . With the development of technology, acoustic telemetry technology gradually become the main means of aquatic ecology. This technique has the advantage of in-situ observation, the use of ultrasound markers can be achieved on the natural aquatic environment, behavior and physiology research. Subjects covered fish, crustaceans, dolphins and sea turtles, helping scientists to understand the impact of human activities on fisheries, fish migration and behavior, species conservation and habitat restoration and other aspects, but also help us to manage and protect aquatic ecosystems system. Vemco Canada Inc. is the world's most famous acoustic telemetry technology providers. Products stable performance, reliable quality, wild withstand a severe test for the latter part of your application to save a small fortune in maintenance costs. A very wide range of products, from the river to the coast can be carried out large-scale fish activity tracking. More than 20,000 global multi-receiver sets VR2W laying for aquatic research in the world. Vemco Canadian companies of all sizes of fish acoustic tags (length from 12mm to 68mm, diameter from 5mm to 16mm), to meet the needs of all types of aquatic animals mark. Key features include searching for fish waters, large-scale tracking, small-scale two-dimensional or three-dimensional positioning. ? 2, the main features of evaluation fishway and fish behavior study the most effective way to achieve individual studies, studies by its efficiency, and to influence their behavior can be evaluated dam 3, the acoustic marker 3.2 3.1 hardware receiver 4, software? - Windows-based systems - to download, view, export data - to establish a database for data classification management - analysis functions: data filtering, chart analysis - Bluetooth, you can also choose underwater cable for cable transmission