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A Review of Particle Image Velocimetry for Fish Migration

Understanding the flow characteristic in fishways is crucial for efficient 
fish migration. Flow characteristic measurements can generally provide quantitative 
information of velocity distributions in such passages; Particle Image Velocimetry 
(PIV) has become one of the most versatile techniques to disclose flow fields in 
general and in fishways, in particular. This paper firstly gives an overview of 
fish migration along with fish ladders and then the application of PIV measurements 
on the fish migration process. The overview shows that the quantitative and detailed 
turbulent flow information in fish ladders obtained by PIV is critical for analyzing 
turbulent properties and validating numerical results.