Predation of pop-up satellite archival tagged albacore (Thunnus alalunga)

Cosgrove, Ronán; Arregui, Igor; Arrizabalaga, Haritz; Goñi, Nicolás; Neilson, John D.

doi:10.1016/j.fishres.2014.09.003

Cited by 16 publications

(18 citation statements)

References 36 publications

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“…Although Cosgrove et al . () demonstrated predation of PSAT tags deployed on albacore ( Thunnus alalunga ), presumably by sharks, the risk of predation ‘bites’ appears to be low in Atlantic bluefin tuna (Lutcavage et al ., ). However, it might be possible that tags are bitten off by other bluefin tuna when feeding in schools.…”

Section: Discussionmentioning

confidence: 99%

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Tracking bluefin tuna reproductive migration into the Mediterranean Sea with electronic pop‐up satellite archival tags using two tagging procedures

Abascal

Medina²,

Serna

et al. 2015

Fisheries Oceanography

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Thirteen adult bluefin tuna were tracked with electronic pop‐up satellite tags during their reproductive migration towards Mediterranean spawning grounds as they entered the Strait of Gibraltar. Fish were caught in tuna traps and tagged either underwater, with the aid of a modified spear gun, or on the deck of the boat. Fish tagged on board initially showed a shallower behavior than those tagged in the water. The pattern of horizontal movements was also different between both groups. Shortly after tagging, the eight fish tagged in the water entered the Mediterranean Sea. Six of these fish reached the spawning ground located southwest of the Balearic archipelago before heading back for the Atlantic, whereas the other two traveled farther east, reaching its easternmost longitudes between Formentera and Sardinia and the South Tyrrhenian Sea, respectively. In contrast, two out of the five fish tagged on board never entered the Mediterranean Sea, and another one did enter the Mediterranean when the reproductive season was already over. These results suggest an impact of the tagging procedure on the post‐release behavior of bluefin tuna. Excluding the tags that popped‐off east of the Strait of Gibraltar, bluefin tuna stayed in the Mediterranean Sea for 22–28 days. Analysis of the median depth indicated a shallow behavior during both day and nighttime throughout the return phase of the fish from the Mediterranean Sea to the Atlantic Ocean with the exception of the area around the Strait of Gibraltar, where they showed a deeper behavior that coincided with a marked vertical gradient in the currents.

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Section: Discussionmentioning

confidence: 99%

“…There may be diverse potential causes for signal failures, such as default in the saltwater switch, aerial breakage, predation and scavenging, fishing, etc. (e.g., Kerstetter et al, 2004;Hays et al, 2007;Fromentin and Lopuszanski, 2014;Cosgrove et al, 2015). The remaining 20 tags detached all before their preset date.…”

Section: Tag Reporting and Retentionmentioning

confidence: 99%

Tracking bluefin tuna reproductive migration into the Mediterranean Sea with electronic pop‐up satellite archival tags using two tagging procedures

Abascal

Medina²,

Serna

et al. 2015

Fisheries Oceanography

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“…Therefore, the ability to detect incidences of predation in tracked animals has implications for accurate post-release survivorship estimates and is of direct conservation interest to resource managers [20]. Moreover, predation events are not necessarily associated with capture effects, and thus identifying instances of consumption helps delineate potential predator-prey interactions [22][23][24][25][26][27][28]. Consequently, identification of BI consumption, potentially indicating animal predation, is important to both the efficacy of ecological studies and development of contemporary management approaches.…”

Section: Open Accessmentioning

confidence: 99%

“…Instances of BI consumption are commonly determined by a qualitative examination of instrumentrecorded data and, depending on the BI, evidenced by changes in behavioral patterns or tailbeat frequencies, elevated temperatures, temperature delays with respect to the depth profile, and negligible light levels [1,22,[24][25][26][27][28][29][30][31][32]. Tag consumption may be obvious in some cases, such as when zero-valued light levels in epipelagic waters concurrent with elevated temperatures clearly indicate BI consumption by an endotherm [22].…”

Section: Open Accessmentioning

confidence: 99%

“…In these cases, BI-recorded data could represent the instrument consumer rather than the target species, resulting in the inaccurate interpretation. Despite the prevalence of BI consumption events identified in the literature [1,22,[24][25][26][27][28][29][30], a standardized, quantitative approach for the assessment of consumption has not been presented. Therefore, a tractable mathematical approach to identify BI consumption across multiple habitats and a suite of predators (consumers) is warranted as a means of validating data prior to biological interpretation.…”

Section: Open Accessmentioning

confidence: 99%

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Was my science project eaten? A novel approach to validate consumption of marine biologging instruments

Tolentino

Howey

et al. 2017

Anim Biotelemetry

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Background: Biologging and tracking instruments provide valuable, remote surveillance on otherwise unobservable marine animals. Instruments can be consumed (ingested) by predators while collecting data, and if not identified, the retrieved dataset could be assigned to the incorrect individual and/or species. Consumption events of instruments, such as pop-up satellite archival tags and data loggers that record ambient light, are typically identified by negligible light levels and visual assessment of data records. However, when light-level data are not available (e.g., environments below the euphotic zone, instrument model), instrument consumption is not easily discernible. Instruments that record concurrent, time-series temperature and depth data provide detailed information on the ambient temperature in the water column. However, if the instrument is consumed, the temperature profile may dissociate from the depth profile, providing evidence and a means for detecting consumption. Results:To quantify the dissociation between time-series depth and temperature profiles, we applied the crosscorrelation function to evaluate the time delay and uncoupling between time-series depth and temperature profiles, suggestive of instrument consumption. Given that instruments may be consumed midway through the deployment duration, we extended the cross-correlation function to systematically slide across time-series profiles, sequentially considering subsets of data, to infer time of consumption. This method was applied to datasets from both deep-water (disphotic and aphotic) and epipelagic (euphotic) environments to evaluate instrument consumption. Results were dependent on ambient environment, data sampling rate, predator physiology, and function parameters.Conclusions: Utilization of the cross-correlation function objectively indicates potential instrument consumption events without the bias induced by subjective methods such as visual assessment of tag-recorded data, and does not require the simultaneous collection of light-level data. This methodology aids in the appropriate biological interpretation of tag-recorded data, ensures that data are not attributed to the incorrect species, and can be used to authenticate data during the validation process. Additionally, it is particularly useful for contrasting datasets from comparable studies (i.e., same location and species) and is applicable across taxa and electronic biologging instrument variations.

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Determining Discard Mortality of Monkfish in a Sea Scallop Dredge Fishery

Weissman

Knotek

Mandelman

et al. 2021

N American J Fish Manag

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Discard mortality studies are considered a primary research priority, particularly for species and fisheries where discard rates are high. Monkfish (the commercial name for Goosefish) Lophius americanus supports the most lucrative finfish fishery in New England, and it is also the second highest bycatch species by weight in the sea scallop dredge fishery. Despite its commercial importance, no data exist with respect to monkfish discard mortality estimates for any gear type. The goals of this study were to evaluate the discard mortality process for monkfish captured in sea scallop dredge gear, estimate mortality rate, and develop best handling/management practices to mitigate the impact of monkfish bycatch in the sea scallop dredge fishery. Discard mortality was estimated during a field study conducted between June and October 2017 on board sea scallop commercial fishing vessels on Georges Bank in the Northwest Atlantic. Pop‐up satellite tags were affixed to 60 monkfish to track survival from 14 to 28 d postcapture. From these monitored individuals, high predation rates were observed (n = 18 out of 26 mortalities), and the bulk of mortalities (n = 21) occurred within the first 24 h of discarding. However, in light of having no clear method for disentangling capture‐related and tag‐induced predation, predation was noted exclusively as one or the other to account for uncertainty and provide an upper and lower bound of mortality. This approach suggested that the discard mortality rate was between 17.9% and 54.1% for monkfish discarded by scallop dredges and that elevated air temperatures (above thermal preferences) may contribute to increased mortality. Based on these results, it appears that monkfish discard mortality is lower than previous assumptions of 100%, and potential best‐practice management suggestions moving forward may include minimizing fishing in areas of high monkfish abundance or scheduling rotating time/area closures during periods when air temperature exceeds monkfish thermal tolerance of 13°C.

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Predation of pop-up satellite archival tagged albacore (Thunnus alalunga)

Cited by 16 publications

References 36 publications

Tracking bluefin tuna reproductive migration into the Mediterranean Sea with electronic pop‐up satellite archival tags using two tagging procedures

Tracking bluefin tuna reproductive migration into the Mediterranean Sea with electronic pop‐up satellite archival tags using two tagging procedures

Was my science project eaten? A novel approach to validate consumption of marine biologging instruments

Determining Discard Mortality of Monkfish in a Sea Scallop Dredge Fishery

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