Otolittreferansesamling for lodde (Mallotus villosus) i Barentshavet
In 2007 a project was initiated at the Institute of Marine Research, Bergen, with the aim to further develop the methods for age determination of fish by their otoliths, as well as to assure the quality of routine age determination work. One of the goals in that project was to develop a reference co...
Main Authors: | , |
---|---|
Format: | Report |
Language: | Norwegian Bokmål |
Published: |
Havforskningsinstituttet
2011
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/113639 |
id |
ftimr:oai:imr.brage.unit.no:11250/113639 |
---|---|
record_format |
openpolar |
spelling |
ftimr:oai:imr.brage.unit.no:11250/113639 2023-05-15T15:39:00+02:00 Otolittreferansesamling for lodde (Mallotus villosus) i Barentshavet Reference collection of Barents Sea capelin (Mallotus villosus) otoliths Røttingen, Bente Alvarez, Jaime 2011-06 application/pdf http://hdl.handle.net/11250/113639 nob nob Havforskningsinstituttet Fisken og havet;5-2011 urn:issn:0071-5638 http://hdl.handle.net/11250/113639 18 s. otoliths otolitter VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Research report 2011 ftimr 2021-09-23T20:15:08Z In 2007 a project was initiated at the Institute of Marine Research, Bergen, with the aim to further develop the methods for age determination of fish by their otoliths, as well as to assure the quality of routine age determination work. One of the goals in that project was to develop a reference collection for each species. These collections would be used as a guide for new age readers, but also for checking the precision of the routine age reading. Bente Røttingen and Jaime Alvarez started to plan a reference collection of capelin otoliths in 2008, and selected otoliths from 1981, when the historic material contained otoliths from all months throughout the year. The otoliths were selected based on the criterion that they should be easy to interpret. Since the age reading of capelin by yearly rings in the otoliths never have been validated, the age given is agreed age by experienced readers. It is concluded that even with the equipment available at present, interpretation of digital pictures cannot replace the direct reading through the binocular. However, the reference collection is a valuable tool for establishing a standard for how capelin otoliths are presently interpreted at the Institute of Marine Research. Report Barents Sea Barentshav* Institute for Marine Research: Brage IMR Barents Sea Bergen Alvarez ENVELOPE(-64.483,-64.483,-65.633,-65.633) |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
Norwegian Bokmål |
topic |
otoliths otolitter VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 |
spellingShingle |
otoliths otolitter VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Røttingen, Bente Alvarez, Jaime Otolittreferansesamling for lodde (Mallotus villosus) i Barentshavet |
topic_facet |
otoliths otolitter VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 |
description |
In 2007 a project was initiated at the Institute of Marine Research, Bergen, with the aim to further develop the methods for age determination of fish by their otoliths, as well as to assure the quality of routine age determination work. One of the goals in that project was to develop a reference collection for each species. These collections would be used as a guide for new age readers, but also for checking the precision of the routine age reading. Bente Røttingen and Jaime Alvarez started to plan a reference collection of capelin otoliths in 2008, and selected otoliths from 1981, when the historic material contained otoliths from all months throughout the year. The otoliths were selected based on the criterion that they should be easy to interpret. Since the age reading of capelin by yearly rings in the otoliths never have been validated, the age given is agreed age by experienced readers. It is concluded that even with the equipment available at present, interpretation of digital pictures cannot replace the direct reading through the binocular. However, the reference collection is a valuable tool for establishing a standard for how capelin otoliths are presently interpreted at the Institute of Marine Research. |
format |
Report |
author |
Røttingen, Bente Alvarez, Jaime |
author_facet |
Røttingen, Bente Alvarez, Jaime |
author_sort |
Røttingen, Bente |
title |
Otolittreferansesamling for lodde (Mallotus villosus) i Barentshavet |
title_short |
Otolittreferansesamling for lodde (Mallotus villosus) i Barentshavet |
title_full |
Otolittreferansesamling for lodde (Mallotus villosus) i Barentshavet |
title_fullStr |
Otolittreferansesamling for lodde (Mallotus villosus) i Barentshavet |
title_full_unstemmed |
Otolittreferansesamling for lodde (Mallotus villosus) i Barentshavet |
title_sort |
otolittreferansesamling for lodde (mallotus villosus) i barentshavet |
publisher |
Havforskningsinstituttet |
publishDate |
2011 |
url |
http://hdl.handle.net/11250/113639 |
long_lat |
ENVELOPE(-64.483,-64.483,-65.633,-65.633) |
geographic |
Barents Sea Bergen Alvarez |
geographic_facet |
Barents Sea Bergen Alvarez |
genre |
Barents Sea Barentshav* |
genre_facet |
Barents Sea Barentshav* |
op_source |
18 s. |
op_relation |
Fisken og havet;5-2011 urn:issn:0071-5638 http://hdl.handle.net/11250/113639 |
_version_ |
1766370463579111424 |