Effectiveness of Venting and Descender Devices at Increasing Rates of Post Release Survival of Black Sea Bass – Rudershausen et al. 2019
- 1,748 black sea bass were tagged with t-bar tags off North Carolina.
- Fish were released with one of four methods, in rotation: 1) no treatment; 2) venting with 11-ga cannula; 3) venting with 16-ga needle; and 4) descending to the seafloor with a Blacktip descender device.
- The average increase in survival as compared to fish that were not treated was 48 percent, 51 percent, and 51 percent for the cannula, needle, and descender respectively.
- It is possible to injure a fish with venting, though when applied correctly it can be as effective as descending.
- Barotrauma mitigation via venting or descending results in greatly improved survival of black sea bass.
Recreational Angler Attitudes and Perceptions Regarding the Use of Descending Devices in Southeast Reef Fish Fisheries – Curtis et al. 2019
- Surveyed 538 recreational anglers (84 percent private, 15 percent charter, 1 percent headboat) regarding use of fish descending devices in the Gulf of Mexico and South Atlantic.
- 72 percent of respondents had little to no knowledge of descending devices prior to the study.
- 70 percent indicated a preference for descending over venting after provided SeaQualizers.
- 76 percent were likely to continue employing the device.
Quantifying Delayed Mortality from Barotrauma Impairment in Discarded Red Snapper Using Acoustic Telemetry – Curtis et al. 2015
- 111 red snapper were tagged with acoustic transmitters over three seasonal trials to assess delayed mortality after release.
- Fish were released with three treatments: non-vented, vented and descended.
- Survival was highest in cooler months and shallower depths.
- Overall survival across all treatments was 72 percent with 15 percent immediate mortality and 13 percent delayed mortality.
- Descended fish were 3 times more likely to survive than non-vented fish and 1.5 times more likely to survive than vented fish.
Venting and Reef Fish Survival: Perceptions and Participation Rates among Recreational Anglers in the Northern Gulf of Mexico – Scyphers et al. 2013
- 604 recreational and tournament anglers were surveyed to understand the popularity and perceived effectiveness of venting fish.
- Approximately 2/3 of anglers vent the fish they release offshore and most perceive it to be effective for improving survival.
- Fishing experience did not influence knowledge of proper venting techniques.
- Misinformation on how to properly vent was common among anglers of all experiences.
- Education and outreach programs are necessary to alter or improve venting practices.