Migratory behaviour of north-east Arctic cod, studied by use of data storage tags

2000 ◽  
Vol 48 (2) ◽  
pp. 127-140 ◽  
Author(s):  
Olav Rune Godø ◽  
Kathrine Michalsen
Keyword(s):  
Data Storage ◽  
Migratory Behaviour ◽  
Arctic Cod ◽  
North East ◽  
Use Of Data ◽  
Data Storage Tags

Spawning behavior in Atlantic cod: analysis by use of data storage tags

2014 ◽  
Vol 506 ◽  
pp. 279-290 ◽  
Author(s):  
TB Grabowski ◽  
V Thorsteinsson ◽  
G Marteinsdóttir
Keyword(s):  
Data Storage ◽  
Atlantic Cod ◽  
Spawning Behavior ◽  
Use Of Data ◽  
Data Storage Tags

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

2017 ◽  
Vol 74 (12) ◽  
pp. 2122-2130 ◽  
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.

Accuracy and precision in stock separation of north-east Arctic and Norwegian coastal cod by otoliths - comparing readings, image analyses and a genetic method

2005 ◽  
Vol 56 (5) ◽  
pp. 753 ◽  
Author(s):  
Erik Berg ◽  
Tuula H. Sarvas ◽  
Alf Harbitz ◽  
Svein Erik Fevolden ◽  
Arnt Børre Salberg
Keyword(s):  
Visual Inspection ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Complete Separation ◽  
Arctic Cod ◽  
Genetic Method ◽  
North East ◽  
Accuracy And Precision ◽  
Growth Zones ◽  
The Difference

The distinction between north-east Arctic cod and Norwegian coastal cod, two major groups of Atlantic cod (Gadus morhua L.), has for many years been based on different distance and shape similarities between the two first translucent growth zones in the otoliths, subjectively decided by visual inspection in a binocular. To analyse the certainty of this technique, four independent readers have classified 263 cod otoliths in total from five different geographical areas. For three of the readers, between 82% and 89% of the classification results coincided with independent results based on genetic analyses. Further, 38 cod otoliths, where the readers were certain of the classification (21 north-east Arctic cod and 17 coastal cod) were classified by several image analysis methods. A complete separation was obtained by using the ratio of the circumferences of the two zones, providing a typical ratio of approximately 2 for coastal and 1.5 for north-east Arctic cod. The otolith method for separating the two types of cod has been considered adequately accurate in assessing the two stocks of cod. However, the method is sensitive to subjective interpretation, and action needs to be taken to minimise the difference in interpretation among otolith readers.

Extrapolating predation mortalities back in time: an example from North-east Arctic cod cannibalism

2018 ◽  
Vol 14 (2) ◽  
pp. 203-216 ◽  
Author(s):  
Natalia A. Yaragina ◽  
Yury Kovalev ◽  
Anatoly Chetyrkin
Keyword(s):  
Arctic Cod ◽  
North East

Spare the Young Fish: Optimal Harvesting Policies for North-East Arctic Cod

2010 ◽  
Vol 47 (4) ◽  
pp. 455-475 ◽  
Author(s):  
Florian K. Diekert ◽  
Dag Ø. Hjermann ◽  
Eric Nævdal ◽  
Nils Christian Stenseth
Keyword(s):  
Optimal Harvesting ◽  
Young Fish ◽  
Arctic Cod ◽  
North East

Research of Data Server Application Software for NBI Mechanical Control on EAST

2012 ◽  
Vol 214 ◽  
pp. 538-542 ◽  
Author(s):  
Xiao Dan Zhang ◽  
Zhi Min Liu ◽  
Peng Sheng ◽  
Chun Dong Hu ◽  
Yuan Zhe Zhao
Keyword(s):  
Data Storage ◽  
C Language ◽  
Use Of Data ◽  
Remote Server ◽  
Data Value ◽  
Server Software ◽  
And Control ◽  
Measurement And Control ◽  
Server Application ◽  
Control Layer

For the sake of achieving to manage and query the experimental data scientifically, as well as relevant experiment information for Neutral Beam Injection (NBI) system, NBI Data Server software is developed for data exchanging between the remote server control layer and the field measurement and control layer, data storage and querying. Experimental results show that managing data scientifically can ensure data security and making best use of data will bring data value into full play. NBI Data Server software is programmed by C language, developed with Client/Server program model and multi-threading technology, runs on linux operating system. Experiments show that NBI data server software can work steadily and reliably.

Sign in / Sign up

Export Citation Format

Share Document