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The divergent effect of capture depth and associated barotrauma on post-recompression survival of canary (Sebastes pinniger) and yelloweye rockfish (S. ruberrimus)

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  • We evaluated the external signs of barotrauma and 48-h post-recompression survival for 17 54 canary and 81 yelloweye rockfish captured at depths of 46-174 m, much deeper than a 18 similar prior experiment, but within the depth range of recreational fishery catch and 19 discard. Survival was measured using specialized sea cages for holding individual fish. 20 The external physical signs associated with extreme expansion and retention of 21 swimbladder gas (pronounced barotrauma), including esophageal eversion, exophthalmia 22 and ocular emphysema, were common for both species at these capture depths and were 23 more frequent than in prior studies conducted at shallower depths. Despite similar 24 frequencies of most external barotrauma signs, 48-h post-recompression survival of the 25 two species diverged markedly as capture depth increased. Survival of yelloweye 26 rockfish was above 80% across all capture depths, while survival of canary rockfish was 27 lower, declining sharply to just 25% at capture depths greater than 135 m. Fish of both 28 species that were alive after 48 h of caging displayed very few of the external signs of 29 pronounced barotrauma and had a high submergence success rate when released at the 30 surface. Logistic regression analysis, using a combined data set from this and an earlier 31 experiment conducted at shallower capture depths, was used to more broadly evaluate 32 factors influencing post-recompression survival. For canary rockfish, depth of capture 33 was negatively related to survival (P<0.0001), but the surface-bottom temperature 34 differential was not (P>0.05). Exophthalmia and ocular emphysema were each 35 negatively associated with survival for canary rockfish (P<0.05). For yelloweye rockfish, 36 no significant associations were found between post-recompression survival and capture 37 depth, the surface-bottom temperature differential or any of the signs of pronounced 38 barotrauma (P>0.05).
  • Keywords: Discard mortality, Sebastes, Recompression, Barotrauma, Caging systems
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  • Hannah, R.W., Ranking, P. S., & Blume, M.T.O. (2014, September). The divergent effect of capture depth and associated barotrauma on post-recompression survival of canary (Sebastes pinniger) and yelloweye rockfish (S. ruberrimus). Fisheries Research, 157, 106-112. doi:10.1016/j.fishres.2014.04.007
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  • 157
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