Pollack being released at depth (VIDEO)
Caption
The Pollack FISP project was led by the University of Plymouth and aimed to provide an initial assessment of post-release survival of pollack under different capture conditions, and assess the use of recompression to mitigate the barotrauma the fish experience. Researchers assessed this using an experimental weighted cage which the fish were placed in after being caught, and which could be lowered to various depths within the water column. The cage was fitted with cameras to monitor the fish’s initial response and showed that they recovered vital reflexes within one to four minutes of being back in the water. This sped up section of a video (the full version is around 10 mins long and is available on request) shows a fish being lowered in the cage and then swimming away once it is opened.
Credit
University of Plymouth
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