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Let's take you on a journey deep down in the ocean. Make sure to grab your drink and have your ears wide open
Fish talk: listening to the ocean to learn about rockfish.
We often think of the underwater world as a silent place. However, many ocean dwelling animals make noise to communicate and use sounds as an important cue for learning about the world around them. Here in BC rockfish are an important group of fish that make noise. I will talk about how fish make noise, how we can use this to study them, and how the noises we make may be impacting their health.
Barotrauma and Brews
Dana Haggarty (Inshore Rockfish Program Head, Fisheries and Oceans Canada)
When anglers catch rockfish the change in depth results in injuries to the rockfish known as barotrauma. Untreated barotrauma is often deadly for rockfish. To decrease mortality from recreational fishing, DFO is now requiring fishermen use descending devices when discarding rockfish. Rockfishes are remarkably resilient and can survive after recompression. However, how barotrauma effects survival rates is complex and many uncertainties remain. Although recompression increases the survival rates of discarded rockfishes, mortality must still be accounted for in management decisions.