Walleye Responses to Barotrauma Relief Treatments for Catch-and-Release Angling: Short-Term Changes to Condition and Behavior

Abstract Barotrauma causes stress and impairment in fish and can cause mortality after catch and release. Relief of barotrauma symptoms is necessary to reduce mortality, but we currently know little about sublethal effects associated with relief methods. Here, we assess the condition and behavior of tournament-caught Walleye Sander vitreus with barotrauma by using three popular relief methods: 1) swim bladder venting, 2) deep-water release (descending), and 3) livewell reorientation with fin weights. In a short-term ex situ experiment, 50% of untreated fish with barotrauma did not recover sufficiently to be released after 20 h. Fin weighting immediately improved condition by enabling fish to regain correct orientation; however, only 53% of fin-weighted fish recovered sufficiently to be released. All vented fish were negatively buoyant, but 73% were releasable after the holding period. In a concurrent in situ study, acoustic telemetry showed that Walleye without barotrauma (controls) made variable postrelease movements (total distance: 5.1–27.6 km), descended fish behaved similarly to controls (4.7–28.6 km), and vented fish made the shortest movements (2.6–16.7 km). However, there were no statistically significant differences in distance metrics among groups. Control and descended fish used larger areas and volumes of the lake than vented fish. Descended fish also used significantly deeper depths than vented fish, and control fish were intermediate in the depth used. Telemetry did not indicate mortality of any fish in the in situ study. Our data suggest that without treatment, mortality of Walleye with barotrauma could be as high as 50%. Fin weighting is not an effective catch-and-release aid for Walleye with moderate-to-severe barotrauma, and swim bladder venting may alter short-term, postrelease movements and habitat use. The consequences of these short-term changes to Walleye behavior from a fisheries management perspective are unclear. Eliminating catch-and-release angling in deep water is the best means of managing barotrauma in Walleye. If deep-water angling cannot be avoided, we recommend noninvasive descending over venting.

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Effect of Environmental Pollutant Mixtures on Acid DNase Activity in Mussel Mytilus galloprovincialis: Ex Situ and In Situ Study

Bulletin of Environmental Contamination and Toxicology ◽

10.1007/s00128-017-2162-y ◽

2017 ◽

Vol 99 (4) ◽

pp. 433-437

Author(s):

Ines Kovačić ◽

Maja Fafanđel ◽

Lorena Perić ◽

Iris Batel

Keyword(s):

Mytilus Galloprovincialis ◽

Environmental Pollutant ◽

Ex Situ ◽

Dnase Activity ◽

In Situ Study ◽

Acid Dnase ◽

Pollutant Mixtures

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Tuning the Electrocatalytic Oxygen Reduction Reaction Activity and Stability of Octahedral Ptni Nanoparticles By Thermal Annealing: An Ex Situ and in Situ study

ECS Meeting Abstracts ◽

10.1149/ma2017-01/31/1435 ◽

2017 ◽

Keyword(s):

Oxygen Reduction Reaction ◽

Oxygen Reduction ◽

Thermal Annealing ◽

Reduction Reaction ◽

Ex Situ ◽

Oxygen Reduction Reaction Activity ◽

In Situ Study ◽

Electrocatalytic Oxygen Reduction

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Dead or alive—estimating post-release mortality of Atlantic cod in the recreational fishery

ICES Journal of Marine Science ◽

10.1093/icesjms/fst038 ◽

2013 ◽

Vol 70 (4) ◽

pp. 864-872 ◽

Cited By ~ 24

Author(s):

Marc Simon Weltersbach ◽

Harry V. Strehlow

Keyword(s):

Baltic Sea ◽

Gadus Morhua ◽

Sublethal Effects ◽

Atlantic Cod ◽

Control Fish ◽

Recreational Fisheries ◽

Release Rates ◽

Release Process ◽

Catch And Release ◽

Recreational Fishery

Abstract Weltersbach, M. S., and Strehlow, H. V. 2013. Dead or alive—estimating post-release mortality of Atlantic cod in the recreational fishery. – ICES Journal of Marine Science, 70: 864–872. Atlantic cod (Gadus morhua) is one of the most important commercial and recreational target species in European marine waters. Recent recreational fisheries surveys revealed that recreational cod catches and release rates are substantial compared to the commercial fishery, particularly in the western Baltic Sea. Despite high release rates, no literature exists exploring the post-release mortality of cod and potential sublethal effects after catch-and-release in recreational fisheries. This study investigates (i) the post-release mortality of undersized cod, (ii) potential factors affecting mortality, and (iii) consequences of the catch-and-release process on cod. During four experimental trials, western Baltic Sea cod were angled from a charter vessel and thereafter observed together with control fish in netpens for 10 d at holding temperatures between 6.2 and 19.8°C. Adjusted mortality rates for angled cod ranged from 0.0–27.3% (overall mean 11.2%). A logistic regression analysis revealed that bleeding and holding-water temperature were the only significant predictors of mortality. Slow hook injury healing (>10 d) and bacterial wound infections were observed in some surviving cod. The results will help to increase the accuracy of recreational cod removal estimates and thereby improve the management of western Baltic cod stock.

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Depth-dependent parental effects create invisible barriers to coral dispersal

Communications Biology ◽

10.1038/s42003-021-01727-9 ◽

2021 ◽

Vol 4 (1) ◽

Author(s):

Tom Shlesinger ◽

Yossi Loya

Keyword(s):

Deep Water ◽

Ex Situ ◽

Small Scale ◽

Parental Effects ◽

Dependent Manner ◽

Local Adaptations ◽

In Situ Experiments ◽

Physical Barriers ◽

Settlement Success

AbstractHistorically, marine populations were considered to be interconnected across large geographic regions due to the lack of apparent physical barriers to dispersal, coupled with a potentially widely dispersive pelagic larval stage. Recent studies, however, are providing increasing evidence of small-scale genetic segregation of populations across habitats and depths, separated in some cases by only a few dozen meters. Here, we performed a series of ex-situ and in-situ experiments using coral larvae of three brooding species from contrasting shallow- and deep-water reef habitats, and show that their settlement success, habitat choices, and subsequent survival are substantially influenced by parental effects in a habitat-dependent manner. Generally, larvae originating from deep-water corals, which experience less variable conditions, expressed more specific responses than shallow-water larvae, with a higher settlement success in simulated parental-habitat conditions. Survival of juvenile corals experimentally translocated to the sea was significantly lower when not at parental depths. We conclude that local adaptations and parental effects alongside larval selectivity and phenotype-environment mismatches combine to create invisible semipermeable barriers to coral dispersal and connectivity, leading to habitat-dependent population segregation.

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Movement and behavior of scarlet macaws (Ara macao) during the post-fledging dependence period: implications for in situ versus ex situ management

Biological Conservation ◽

10.1016/j.biocon.2003.09.018 ◽

2004 ◽

Vol 118 (3) ◽

pp. 411-420 ◽

Cited By ~ 18

Author(s):

Mark C Myers ◽

Christopher Vaughan

Keyword(s):

Ex Situ ◽

Ara Macao ◽

And Behavior ◽

Ex Situ Management

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In situ study of short-term variations of redox species chemistry in intertidal permeable sediments of the Arcachon lagoon

Hydrobiologia ◽

10.1007/s10750-012-1154-5 ◽

2012 ◽

Vol 699 (1) ◽

pp. 69-84 ◽

Cited By ~ 14

Author(s):

M. L. Delgard ◽

B. Deflandre ◽

E. Metzger ◽

D. Nuzzio ◽

S. Capo ◽

...

Keyword(s):

Short Term ◽

Redox Species ◽

Permeable Sediments ◽

In Situ Study ◽

Arcachon Lagoon

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Macroinvertebrates and fishes in the part of the Danube flowing through the Iron Gate national park and possibilities of their protection under in situ and ex situ conditions

Archives of Biological Sciences ◽

10.2298/abs0402053s ◽

2004 ◽

Vol 56 (1-2) ◽

pp. 53-57 ◽

Cited By ~ 6

Author(s):

Vladica Simic ◽

Snezana Simic

Keyword(s):

National Park ◽

Stress Factors ◽

Ex Situ ◽

Legal Regulations ◽

Medium Term ◽

Natural Conditions ◽

In Situ Study ◽

Iron Gate ◽

Comparison Of The Results

Comparison of the results of later investigations of the Danube in the part flowing through in the Iron Gate (Djerdap) National Park with those of research conducted earlier (20 to 40 years ago) shows that changes have occurred in regard to the presence and especially the abundance of certain hydrobionts on this sector of the river, a finding that applies to all groups examined. The paper discusses the potential and results of conservation measures realized through both legal regulations and medium-term plans for the advancement of fishing in this region. In addition to in situ study during the period from 1999 to 2003, a large number of species (especially of macroinvertebrates and fish) were also investigated under artificial conditions (in the Kragujevac Aquarium) in order to gain a better understanding of their ecological characteristics, especially their sensitivity to various environmental stress factors. The presented results indicate that weight of specimens and success of culturing under ex situ conditions are correlated with their sensitivity under natural conditions.

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Plasma Passivation Scheme for III–V Compound Semiconductor Surfaces

MRS Proceedings ◽

10.1557/proc-38-499 ◽

1984 ◽

Vol 38 ◽

Cited By ~ 6

Author(s):

J. B. Theeten ◽

S. Gourrier ◽

P. Friedel ◽

M. Taillepied ◽

D. Arnoult ◽

...

Keyword(s):

Auger Spectroscopy ◽

Ex Situ ◽

Leakage Currents ◽

In Situ Study ◽

Gaas Devices ◽

Deposition Yield ◽

Plasma Passivation ◽

Electrical Analysis ◽

Recombination Velocity

AbstractPassivation of III-V compounds, especially GaAs, is still a major problem. Surface mechanisms related to stoichiometry defects (free As formation, vacancies) play an important role in the detrimental effects observed on GaAs devices (interface traps, leakage currents, parasitic transients …).We first analyze the phenomena occuring at GaAs (100) surfaces exposed to several (H2,N2 ) multipolar plasmas, with the following methods : - in situ study of the surface morphology and roughness using ellipsometry and electron diffraction - chemical analysis using photoemission and Auger spectroscopy - electrical analysis in situ (Fermi level position deduced from photoemission, work function measurements) or ex situ (device characterization, C(V) analysis).Using H2 based plasma treatments, a complete cleaning (oxide and contamination removal) can be obtained at moderate (below 200 °C) temperatures. This process, associated with surface nitridation and dielectric deposition, yield improved surface properties (lower recombination velocity and reduction of devices parasitic effects).The case of Ga1−xInxAs (100) surfaces (with x varying from 0 to 0.53)is then discussed and a comparative study is given, indicating that native nitridation may also be a good solution,in this case.

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