Discard composition and release fate in the snapper and grouper commercial hook‐and‐line fishery in North Carolina, USA

Rudershausen, Paul J.; Buckel, Jeffrey A.; Williams, Erik H.

doi:10.1111/j.1365-2400.2007.00530.x

Cited by 42 publications

(63 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Survival during the spring trials when two depths were compared was 88% at 30 m and 65% at 50 m. Both of these estimates fall within the range of the SEDAR31-DW22 meta-analysis estimates (Campbell et al 2012) (Burns et al 2002;Rudershausen et al 2007;Sauls 2014), and most pertinently Red Snapper, for which depth was the most important factor in determining release mortality (Campbell et al 2013).…”

supporting

confidence: 61%

Quantifying Delayed Mortality from Barotrauma Impairment in Discarded Red Snapper Using Acoustic Telemetry

et al. 2015

View full text Add to dashboard Cite

Red Snapper Lutjanus campechanus is the most economically important reef fish in the Gulf of Mexico, and despite being intensively managed, the stock remains overfished. These fish are susceptible to pressure‐related injuries (i.e., barotrauma) during fishing that compromise survival after catch and release. Barotrauma‐afflicted fish may not only experience immediate mortality but also delayed mortality after returning to depth. This variability and unknown fate leads to uncertainty in stock assessment models and rebuilding plans. To generate better estimates of immediate and delayed mortality and postrelease behavior, Red Snapper were tagged with ultrasonic acoustic transmitters fitted with acceleration and depth sensors. Unique behavior profiles were generated for each fish using these sensor data that allowed the classification of survival and delayed mortality events. Using this information, we compared the survival of Red Snapper released using venting, nonventing, and descending treatments over three seasons and two depths. Red Snapper survival was highest at cooler temperatures and shallower depths. Fish released using venting and descender tools had similar survival, and both these groups of fish had higher survival than nonvented surface‐released fish. Overall, Red Snapper had 72% survival, 15% immediate mortality, and 13% delayed mortality, and all fish suffering from delayed mortality perished within a 72‐h period after release. Results from these field studies enhance the understanding of the delayed mortality and postrelease fate of Red Snapper regulatory discards. Moreover, these data support the practice of using venting or descender devices to increase the survival of discarded Red Snapper in the recreational fishery and show that acoustic telemetry can be a valuable tool in estimating delayed mortality. Received March 6, 2015; accepted July 15, 2015

show abstract

supporting

confidence: 61%

Quantifying Delayed Mortality from Barotrauma Impairment in Discarded Red Snapper Using Acoustic Telemetry

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Unfortunately, it was not possible to truly examine speed as a stand-alone predictor given that the exclusion of night records was built into the dataset. Multiple data sources suggest that the temporal fishing preferences observed in this study (Figure 4) are similar to general patterns observed elsewhere in the study area (Rudershausen et al 2007;Stephen and Harris 2010) and the region. Analysis of an additional unobserved 87 EVM monitored trips by some of the same vessels used in this study revealed that the fishing activity occurring between 2200 and 0500 hours only accounted for 2% of the total hours fished (M. S. Baker Jr., unpublished data).…”

Section: Filter and Logit Model Performancesupporting

confidence: 83%

“…Trips 3 and 4 were completed by the same vessel. Fishing occurred 32-160 km offshore in water depths ranging from 21 to 148 m. The fishing practices and terminal tackle used by fishermen were similar to that described in Rudershausen et al (2007), Stephen andHarris (2010), andScott-Denton et al (2011).…”

Section: Methodssupporting

confidence: 54%

“…The majority of fishing activity is thought to occur in midshelf and shelf-break waters (Stephen and Harris 2010). While nighttime fishing is allowed, most fishing is reported to occur between sunrise and sunset (Rudershausen et al 2007;Stephen and Harris 2010). The area of interest for this study is the northern portion of the management area off the coasts of North Carolina, South Carolina, and Georgia.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Potential for a Simple GPS‐Based Binary Logit Model to Predict Fishing Effort in a Vertical Hook‐and‐Line Reef Fish Fishery

2016

View full text Add to dashboard Cite

Accurate fishing effort information is fundamental to the successful management of fisheries resources. Automated, independent, and reliable methods for quantifying fishing effort are needed. The use of vessel speed from Global Positioning System (GPS) data to identify fishing activity has worked well for trawl fisheries but has been less successful in stationary fisheries. Therefore, five trips on four vessels from a vertical hook‐and‐line reef fish fishery were used to examine the efficacy of GPS (speed and time) and electronic video monitoring (EVM) sensor (drum and video) data to corroborate an observer's account of effort using binary logistic regression classification (logit) models as well as a simple speed and time filter (filter). One minute was the minimum data collection interval examined that documented 100% of fishing events. As no fishing occurred at night, opportunistically defined as the 7 h between 2200 and 0500 hours, these records were excluded from analyses. During the day, vessels spent on average 45.2% of the time fishing. Classification success of the approaches examined ranged from 82.4% to 89.5%. Models that included both GPS and EVM sensor data outperformed the filter and GPS‐only models. In general, the filter and most model results can be used as a proxy for observer effort data, at least for the trips examined here. The GPS‐based speed + time logit model was chosen as the preferred approach because of its discriminatory power compared with the filter and the existing widespread use and lower costs of GPS data collection relative to EVM systems and sensors. The speed + time logit model outlined here may have broad utility in this and similar vertical‐line fisheries, including the offshore marine recreational fishing sector. Received September 9, 2015; accepted December 15, 2015

show abstract

“…Release mortality can be particularly high (~100%) for deep-water species, due to barotrauma (Davis 2002, Rudershausen et al 2007. As stated by Huntsman et al (1999, p. 225), 'expanding gases during capture damage internal organs, displace eyes from their sockets, and otherwise seriously injure the fish.'…”

Section: Introductionmentioning

confidence: 99%

Release mortality of endangered Warsaw grouper Hyporthodus nigritus: a state-space model applied to capture-recapture data

Shertzer

Bacheler

Kellison

et al. 2018

Endang. Species. Res.

View full text Add to dashboard Cite

Warsaw grouper Hyporthodus nigritus is a large-bodied, deep-water, demersal fish listed on the IUCN Red List as Critically Endangered. In the USA, harvest of Warsaw grouper in recent decades has been heavily limited or prohibited. However, Warsaw grouper is part of a multispecies snapper−grouper fishery, making this species vulnerable to incidental capture (and release) as bycatch, even if not targeted for harvest. Therefore, release mortality is a primary concern for the recovery of this endangered species, especially given the potential barotraumatic effects of capture. Here, we used a long-term (11 yr) data set containing capture-recapture information on Warsaw grouper from a shallow site off the Atlantic coast of Florida. The data were collected through a citizen-science program, the South Carolina Marine Game Fish Tagging Program. We fit a state-space model to these data that accounts for -and provides estimates ofrelease mortality as a function of length. These estimates quantify the combined effect of immediate and delayed mortality. We found that release mortality increased with length, from expected values lower than 10% to values exceeding 70%. At a total length of 700 mm, near our observed mean, the expected release mortality was 34% (95% credible interval of 3−57%). In general, release mortality estimates were lower than might be assumed (~100%) for a deep-water grouper. We suggest possible explanations for this result, such as the relatively shallow depth (~49 m) of this study and the careful treatment of released fish, and conclude by discussing implications for future research and conservation.

show abstract

Discard composition and release fate in the snapper and grouper commercial hook‐and‐line fishery in North Carolina, USA

Cited by 42 publications

References 12 publications

Quantifying Delayed Mortality from Barotrauma Impairment in Discarded Red Snapper Using Acoustic Telemetry

Quantifying Delayed Mortality from Barotrauma Impairment in Discarded Red Snapper Using Acoustic Telemetry

Potential for a Simple GPS‐Based Binary Logit Model to Predict Fishing Effort in a Vertical Hook‐and‐Line Reef Fish Fishery

Release mortality of endangered Warsaw grouper Hyporthodus nigritus: a state-space model applied to capture-recapture data

Contact Info

Product

Resources

About