00000nam 2200000zi 4500 9.880373 CaOODSP 20221107165745 m o d f cr cn||||||||| 191008t20192019onca ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn-bc Fs70-5/2019-042E-PDF Haggarty, D. R., author. A review of the use of recompression devices as a tool for reducing the effects of barotrauma on rockfishes in British Columbia / D.R. Haggarty. Ottawa ON : Canadian Science Advisory Secretariat, 2019. ©2019 1 online resource (iv, 34 pages) : illustrations (chiefly colour). text txt rdacontent computer c rdamedia online resource cr rdacarrier Research document, 1919-5044 ; 2019/042 Issued also in French under title: Examen de l'utilisation de dispositifs de recompression comme outils pour réduire les effets des barotraumatismes chez les sébastes en Colombie-Britannique. Cover title. "August 2019." Includes bibliographical references (pages 31-34). "Pacific Rockfish (genus Sebastes) suffer high rates of barotrauma when they are brought to the ocean's surface because they have a closed, or physoclistic, gas bladder. Although many jurisdictions recommend the use of descending devices that return recreationally caught fish with barotrauma to depth, little research on the use of these devices and the survival of recompressed fishes has been done in British Columbia. The purpose of this report is to review the literature regarding the effects of barotrauma on rockfishes and the ability of recompression devices to decrease mortality of released fish in the short- and long-term; document types of descending devices and what is known about each; synthesize study results for each species that occurs in BC; and characterize research gaps and uncertainty. Rockfish species are found to demonstrate a remarkable ability to recover from barotrauma and to survive after recompression in the short-term. However, the effects of barotrauma and variation in survival rates are complex in this diverse genus of fishes, and a number of uncertainties remain. Although recompression certainly increases the survival rates of discarded fish that would otherwise be unable to descend and therefore risk predation, keeping what you catch and moving fishing locations to avoid further capture or ceasing to fish once limits have been reached remain better recommendations. Incorporating the voluntary or mandatory use of descending devices in the management of recreational rockfish fisheries will require careful consideration because considerable uncertainty about their effectiveness to mitigate rockfish mortality on a scale that affects populations remains"--Abstract, page iv. gccst Salt water fish gccst Fisheries Canada. Department of Fisheries and Oceans. Pacific Region. Canadian Science Advisory Secretariat. Examen de l'utilisation de dispositifs de recompression comme outils pour réduire les effets des barotraumatismes chez les sébastes en Colombie-Britannique / (CaOODSP)9.880375 Research document (Canadian Science Advisory Secretariat) 2019/042. (CaOODSP)9.507396 PDF 730 KB https://publications.gc.ca/collections/collection_2019/mpo-dfo/fs70-5/Fs70-5-2019-042-eng.pdf