Capture-induced physiological stress and postrelease mortality for Southern bluefin tuna (<i>Thunnus maccoyii</i>) from a recreational fishery

Tracey, S; Hartmann, Klaas; Leef, MJ; McAllister, Jaime D.

doi:10.1139/cjfas-2015-0516

Cited by 26 publications

(31 citation statements)

References 37 publications

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“…3). In addition, light-tackle fight times did not differ from those for 24 southern bluefin tuna tagged by Tracey et al [19] corresponding to the large school-and small medium size classes caught on conventional tackle (p = 0.9).…”

Section: Table 1 Catch and Tag Information For Released Atlantic Bluementioning

confidence: 52%

“…It is important to establish a threshold deployment duration to determine which prematurely released PSATs should be included in the post-release mortality estimate [18,29]. While previous post-release mortality studies have indicated that most capture-induced mortalities tend to occur within 48 h of release [6,19,30,31], the 5 days following release has often been used as the interval during which mortalities would be considered angling-induced (as opposed to natural mortalities) [8,18]. As a result, to avoid misinterpreting the fate of surviving fish from tags that released prematurely, only tags from fish that remained attached for 5 days or longer and whose summary data for the first 5 days were consistent with survival were included as survivors in the estimate of post-release mortality.…”

Section: Tag Deploymentmentioning

confidence: 99%

“…For the purposes of bootstrapping, natural mortality M was assumed to be 0.14 year −1 and ageindependent, an assumption similar to that used in the 2014 stock assessment for western Atlantic bluefin tuna conducted by the International Commission for the Conservation of Atlantic Tunas (ICCAT) Standing Committee on Research and Statistics [32]. The post-release mortality estimate for the light-tackle fishery was statistically compared with Marcek and Graves' [18] estimate for school-size Atlantic bluefin tuna caught in the troll fishery, as well as with Tracey et al 's [19] estimate for southern bluefin tuna caught in the troll and drift fishery, using Fisher's exact tests.…”

Section: Tag Deploymentmentioning

confidence: 99%

“…Marcek and Graves [18] observed a post-release mortality rate of 0% for 19 school-size (91-< 119 cm CFL) Atlantic bluefin tuna tagged with PSATs after being caught using 23-91 kg trolling tackle and fought for 5.5-12 min. Most recently, Tracey et al [19] deployed PSATs on 59 southern bluefin tuna (Thunnus maccoyi), primarily of sizes comparable to the school and large school size classes (91-< 150 cm CFL), caught while trolling artificial lures or drifting with natural baits with 15-37 kg tackle (fight times ranged from 3 to 118 min), estimating a post-release mortality rate of 19%. Only five of the 59 fish tagged were caught with treble hooks, but two of those fish died, suggesting that the use of treble hooks increases post-release mortality (though the small sample size precluded statistical testing).…”

Section: Introductionmentioning

confidence: 99%

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Performance of a low-cost, solar-powered pop-up satellite archival tag for assessing post-release mortality of Atlantic bluefin tuna (Thunnus thynnus) caught in the US east coast light-tackle recreational fishery

2017

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Background: Pop-up satellite archival tags (PSATs) are a valuable tool for estimating mortality of pelagic fishes released from commercial and recreational fishing gears. However, the high cost of PSATs limits sample sizes, resulting in low-precision post-release mortality estimates with little management applicability. We evaluate the performance of a lower-cost PSAT designed to enable large-scale post-release mortality studies. The tag uses solar rather than battery power, does not include a depth sensor, and transmits daily summaries of light and temperature data rather than high-resolution habitat profiles, contributing to a substantially lower per-unit price. We assessed the tag's ability to detect mortality while also estimating the post-release mortality of juvenile (119-< 185 cm) Atlantic bluefin tuna (Thunnus thynnus) caught using light-tackle angling methods along the US east coast. Results: Using high-resolution data from previously deployed PSATs and environmental information from the general tagging location, we established parameters to infer mortality for Atlantic bluefin tuna using only daily summary data. We then deployed 22 PSATs, programmed to pop off after 31 days (thus providing 30 full daily summaries), on Atlantic bluefin tuna caught using light tackle off the coasts of Massachusetts and North Carolina, USA, in 2015 and 2016. Data were recovered for 15 tags with deployments ranging from 7 days (premature shedding) to 95 days (failed pop-off) and indicated that tagged fish spent sufficient time near the surface to keep the solar-powered tags fully charged. Fourteen fish demonstrated strong temporal changes in temperature indicating vertical movement in the water column, consistent with survival. One fish was predated upon after 17 days, likely by a shortfin mako, and was considered a natural mortality, resulting in a post-release mortality estimate of 0%. Conclusions: While low reporting rates complicated inferences about post-release mortality, the concept of using species-specific mortality parameters coupled with a reduced dataset shows promise as a cost-effective tool for detecting post-release mortality using PSATs. In addition, findings suggest that catch-and-release angling is a viable conservation strategy for juvenile Atlantic bluefin tuna caught in the US east coast light-tackle fishery.

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Section: Table 1 Catch and Tag Information For Released Atlantic Bluementioning

confidence: 52%

Section: Tag Deploymentmentioning

confidence: 99%

Section: Tag Deploymentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance of a low-cost, solar-powered pop-up satellite archival tag for assessing post-release mortality of Atlantic bluefin tuna (Thunnus thynnus) caught in the US east coast light-tackle recreational fishery

2017

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“…For all fish from which tags detached prematurely, an assessment of post-release survival was undertaken. If mortality occurred within 10 days' post-release, it was determined to have been induced by the capture event (Tracey et al, 2016). Examinations of depth, light and temperature profiles in the days following release were undertaken to estimate the fate of all tagged fish.…”

Section: Geolocation Estimationmentioning

confidence: 99%

The global biology, ecology and phylogenetic status of black marlin (Istiompax indica)

Williams¹

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The black marlin [Istiompax indica (Morrow, 1968)] is one of the largest teleost fish and has a continuous distribution throughout tropical waters of the Indo-Pacific. Throughout its range, I. indica has been documented to undertake wide-ranging, transoceanic and transequatorial movements. In coastal waters and on the high seas I. indica may be targeted by commercial and artisanal fisheries, but the majority of the world's landings are as a by-product species of tuna longline and purse seine fisheries. Due to its large size and 'fighting qualities', I. indica is also valued as a prized sport or game fish in recreational fisheries. While considerable effort to understand the level of exploitation of high value species such as the tunas has occurred, the stock status for many other species caught on the high seas such as many sharks, dolphinfish and istiophorid billfishes remain unassessed. This lack of attention is reflected by I. indica being listed as 'Data Deficient' on the International Union for Conservation of Nature Red List. The lack of attention and data available on I. indica extends to biological, ecological, taxonomic and fisheries catch records, which in turn hinders stock assessments and management. This thesis aims to improve the biological and ecological knowledge of I. indica, thereby providing a stronger foundation for assessments and management of stocks globally. PUBLICATIONS DURING CANDIDATURE Peer-reviewed papers and book chaptersA Cohen, D. Spooner and SM. Williams (In Press). Examining the importance of marine transport and transport infrastructure and the initiatives adopted for managing potential impacts whilst enhancing transport services. Moreton Bay and Catchment.

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Fish Welfare in Recreational Fishing

et al. 2020

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Capture-induced physiological stress and postrelease mortality for Southern bluefin tuna (Thunnus maccoyii) from a recreational fishery

Cited by 26 publications

References 37 publications

Performance of a low-cost, solar-powered pop-up satellite archival tag for assessing post-release mortality of Atlantic bluefin tuna (Thunnus thynnus) caught in the US east coast light-tackle recreational fishery

Performance of a low-cost, solar-powered pop-up satellite archival tag for assessing post-release mortality of Atlantic bluefin tuna (Thunnus thynnus) caught in the US east coast light-tackle recreational fishery

The global biology, ecology and phylogenetic status of black marlin (Istiompax indica)

Fish Welfare in Recreational Fishing

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