Life under pressure: insights from electronic data-storage tags into cod swimbladder function

Abstract van der Kooij, J., Righton, D., Strand, E., Michalsen, K., Thorsteinsson, V., Svedäng, H., Neat, F. C., and Neuenfeldt, S. 2007. Life under pressure: insights from electronic data-storage tags into cod swimbladder function. – ICES Journal of Marine Science. 64: 1293–1301. The behavioural response of cod (Gadus morhua) to sudden pressure reductions was investigated in a large electronic-tagging experiment using data collected from 141 cod tagged in five different areas of the Northeast Atlantic. More than 40% of cod exhibited a characteristic equilibration behaviour after a rapid pressure reduction caused either by capture before tagging, or by pressure reduction during a rapid ascent from the seabed, or when migrating to deeper water. The equilibration allowed the cod to regain demersal residence. The rate of descent averaged 10 m d−1 (ranging from 2 to 23 m d−1) over periods of less than a day to 1 month. Descent rates for cod on the Icelandic shelf were inversely related to fish length, i.e. smaller fish descended more rapidly, findings consistent with results achieved in the past under laboratory conditions. Modelling of swimbladder volume during equilibration suggested that cod were negatively buoyant for most of the time. The results imply that swimbladder functionality is retained after the probable barotrauma that would follow a large and rapid ascent, and that rates of gas exchange into the swimbladder may be naturally variable. These findings have implications for assumptions on discard mortality, the interpretation of cod behaviour, and its impact on biomass estimates obtained from acoustic surveys.

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Using data storage tags to link otolith macro- structure in Baltic cod Gadus morhua with environmental conditions

Marine Ecology Progress Series ◽

10.3354/meps07876 ◽

2009 ◽

Vol 378 ◽

pp. 161-170 ◽

Cited By ~ 20

Author(s):

K Hüssy ◽

B Nielsen ◽

H Mosegaard ◽

LW Clausen

Keyword(s):

Data Storage ◽

Environmental Conditions ◽

Gadus Morhua ◽

Data Storage Tags ◽

Using Data ◽

Baltic Cod

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Reconstructing migrations of individual cod (Gadus morhua L.) in the Baltic Sea by using electronic data storage tags

Fisheries Oceanography ◽

10.1111/j.1365-2419.2007.00458.x ◽

2007 ◽

Vol 16 (6) ◽

pp. 526-535 ◽

Cited By ~ 31

Author(s):

STEFAN NEUENFELDT ◽

HANS-HARALD HINRICHSEN ◽

ANDERS NIELSEN ◽

KEN H. ANDERSEN

Keyword(s):

Baltic Sea ◽

Data Storage ◽

Gadus Morhua ◽

The Baltic Sea ◽

Electronic Data ◽

Data Storage Tags ◽

The Baltic

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The dispersal patterns and behaviour of North Sea cod (Gadus morhua) studied using electronic data storage tags

Aquatic Telemetry ◽

10.1007/978-94-017-0771-8_23 ◽

2002 ◽

pp. 201-208 ◽

Cited By ~ 1

Author(s):

K. Turner ◽

D. Righton ◽

J. D. Metcalfe

Keyword(s):

Data Storage ◽

North Sea ◽

Gadus Morhua ◽

Dispersal Patterns ◽

Electronic Data ◽

Data Storage Tags

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Evidence for alternative migratory behaviours in the northern Gulf of St Lawrence population of Atlantic cod (Gadus morhua L.)

ICES Journal of Marine Science ◽

10.1093/icesjms/fst068 ◽

2013 ◽

Vol 70 (4) ◽

pp. 793-804 ◽

Cited By ~ 20

Author(s):

Arnault Le Bris ◽

Alain Fréchet ◽

Peter S. Galbraith ◽

Joseph S. Wroblewski

Keyword(s):

Data Storage ◽

Gadus Morhua ◽

Atlantic Cod ◽

Fork Length ◽

Daily Maximum ◽

Migration Routes ◽

Data Storage Tags ◽

Spawning Behaviour ◽

Using Data ◽

Migration Propensity

Abstract Le Bris, A., Fréchet, A., Galbraith, P. S., and Wroblewski, J. S. 2013. Evidence for alternative migratory behaviours in the northern Gulf of St Lawrence population of Atlantic cod (Gadus morhua L.). – ICES Journal of Marine Science, 70: 793–804. Inter-individual variation in migration propensity affects population dynamics and connectivity. The diversity of migratory behaviours of Atlantic cod (fork length >40 cm) in the northern Gulf of St Lawrence was studied using data-storage tags that record depth and temperature. Movement patterns of Atlantic cod equipped with data-storage tags were reconstructed using a geolocation model based on daily maximum depth and bottom temperature. Reconstructed migration routes revealed the previously undocumented coexistence of resident and migratory individuals in the population. Migratory cod overwintered in relatively deep (300–500 m) and warm (5°C) waters, while residents displayed a prolonged period of immobility in shallow (<100 m) and near-freezing (–1.5°C) coastal waters of western Newfoundland. In the spring, migratory cod displayed extensive diel vertical migration suggestive of spawning behaviour. The presence of alternative migratory behaviours should be considered in the spatiotemporal management of the collapsed population.

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Observations of natural behaviour of yellowtail flounder derived from data storage tags

ICES Journal of Marine Science ◽

10.1016/j.icesjms.2004.07.005 ◽

2004 ◽

Vol 61 (7) ◽

pp. 1151-1156 ◽

Cited By ~ 9

Author(s):

Stephen J. Walsh ◽

M. Joanne Morgan

Keyword(s):

Data Storage ◽

Seasonal Variations ◽

Time Of Day ◽

Electronic Data ◽

Yellowtail Flounder ◽

Limanda Ferruginea ◽

Natural Behaviour ◽

Data Storage Tags ◽

First Time ◽

Temperature Time

Abstract Electronic data storage tags (DSTs) were used to monitor natural behaviour of adult yellowtail flounder (Limanda ferruginea) in relation to depth, temperature, time of day, and season. Over a 2-year period, a total of 543 fish tagged with DSTs were released during June of each year. Results from 29 tags revealed that yellowtail flounder exhibit diel and seasonal variations in depth and temperature. The results also show, for the first time in this species, that during various times of the year yellowtail flounder make extensive off-bottom movements at night and can remain off bottom for several hours.

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Migration patterns of the Faroe Plateau cod ( Gadus morhua , L.) revealed by data storage tags

Fisheries Research ◽

10.1016/j.fishres.2017.06.014 ◽

2017 ◽

Vol 195 ◽

pp. 37-45 ◽

Cited By ~ 2

Author(s):

Katharina Maj Ottosen ◽

Martin Wæver Pedersen ◽

Sólvá Káradottir Eliasen ◽

Petur Steingrund ◽

Eyðfinn Magnussen ◽

...

Keyword(s):

Data Storage ◽

Gadus Morhua ◽

Migration Patterns ◽

Data Storage Tags

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Connectivity among offshore feeding areas and nearshore spawning grounds; implications for management of migratory fish

ICES Journal of Marine Science ◽

10.1093/icesjms/fsx103 ◽

2017 ◽

Vol 75 (1) ◽

pp. 148-157 ◽

Cited By ~ 3

Author(s):

Jón Sólmundsson ◽

Ingibjörg G Jónsdóttir ◽

Stefán Á Ragnarsson ◽

Björn Björnsson

Keyword(s):

Data Storage ◽

Gadus Morhua ◽

Migratory Fish ◽

Long Distance ◽

Migration Patterns ◽

Spatial Management ◽

Data Storage Tags ◽

Low Levels ◽

Mature Fish ◽

Migration Pathways

Abstract Knowing movement and structure of fish populations is a prerequisite for effective spatial fisheries management. The study evaluates migration patterns and connectivity of two groups of cod (Gadus morhua) associated with offshore feeding and nursery grounds. This was achieved by investigating (i) migration pathways of cod tagged at the feeding areas, (ii) immigration of cod to the areas based on mark-recapture data covering a period of two decades, and (iii) depth and temperature data from data storage tags (DSTs). Despite undertaking long-distance migrations after attaining sexual maturity, the cod aggregations in the two study areas appear to be largely separated from each other. This conclusion is supported by DSTs, indicating that mature fish associated with the two areas occupy different thermal-bathymetric niches. Low levels of connectivity suggest that effective spatial management in the two study areas would preserve fish of different origin. For the highly migratory adults, however, spatial management would need to focus on migration pathways and the areas where the fish are particularly vulnerable to fishing.

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Otolith shape differences between ecotypes of Icelandic cod (Gadus morhua) with known migratory behaviour inferred from data storage tags

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2016-0307 ◽

2017 ◽

Vol 74 (12) ◽

pp. 2122-2130 ◽

Cited By ~ 3

Author(s):

Hlynur Bardarson ◽

Bruce. J. McAdam ◽

Vilhjalmur Thorsteinsson ◽

Einar Hjorleifsson ◽

Gudrun Marteinsdottir

Keyword(s):

Data Storage ◽

Gadus Morhua ◽

Fourier Transforms ◽

Function Analysis ◽

Variable Temperature ◽

Otolith Shape ◽

Use Of Data ◽

Data Storage Tags ◽

Migratory Strategies ◽

Definition Of

Otolith shape can be used to identify ecotypes of the Icelandic cod (Gadus morhua) stock. The use of data storage tags has increased our knowledge of the stock structure of Icelandic cod. The profiles of tagged cod reveal different migratory strategies. This has led to the definition of two ecotypes within the cod stock. Frontal ecotypes reside in deep waters during feeding season and express a highly variable temperature profile associated with thermal fronts, while coastal ecotypes stay in shallow waters all year round. In this study, the data storage tag profiles were analysed with cluster analysis, which revealed the existence of an intermediate behaviour that expresses a variable depth profile and feeding migration that is both shorter in time and not as deep. The main objective was to develop a morphological key based on otoliths to distinguish the ecotypes. The shape of the otoliths was extracted with shape measurements and fast Fourier transforms. A discriminant function analysis indicated a difference in morphology between the ecotypes, resulting in successful classification.

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Using Electronic Data Interchange (EDI) to Improve the Efficiency of Accounting Transactions

The Accounting Review ◽

10.2308/accr.2002.77.4.703 ◽

2002 ◽

Vol 77 (4) ◽

pp. 703-729 ◽

Cited By ~ 27

Author(s):

Shannon W. Anderson ◽

William N. Lanen

Keyword(s):

Information Technology ◽

Processing Time ◽

Electronic Data Interchange ◽

Order Scheduling ◽

Negative Effects ◽

Electronic Data ◽

Order Processing ◽

Data Interchange ◽

Using Data ◽

Office Furniture

Electronic data interchange (EDI) is an information technology that standardizes the exchange of information between transacting parties. Using data from a major U.S. office furniture manufacturer that adopted EDI primarily to improve the efficiency of accounting transactions, we evaluate whether EDI reduces order-processing time (the time from sales order receipt to sales order scheduling) and whether this improvement is greater for more complex orders. Our measure of complexity reflects both the mix of different products the dealer orders as well as features and options the dealer selects for each product in the order. We find that EDI is associated with faster order processing, independent of complexity, and that EDI mitigates most of the negative effects of complexity on processing time. We also find that dealers learn to submit error-free orders to the manufacturer, and that previous errors provide feedback that helps dealers submit more accurate orders. However, we find only mixed evidence that order complexity impedes learning.

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