Age class composition and growth of Atlantic cod (Gadus morhua) in the shallow water zone of Kongsfjorden, Svalbard
Although Atlantic cod has been observed in Svalbard waters since the 1880s, knowledge about the presence in the Arctic shallow water zone is limited. The regular catch of juvenile Atlantic cod in Kongsfjorden since 2008 is in line with an overall northward shift of boreal fish species toward the Arc...
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| Veröffentlicht in: | Polar biology 2023-01, Vol.46 (1), p.53-65 |
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| creator | Brand, Markus Spotowitz, Lisa Mark, Felix Christopher Berge, Jørgen Langhelle, Erlend Lindau Węsławski, Jan Marcin Godiksen, Jane Aanestad Fischer, Philipp |
| description | Although Atlantic cod has been observed in Svalbard waters since the 1880s, knowledge about the presence in the Arctic shallow water zone is limited. The regular catch of juvenile Atlantic cod in Kongsfjorden since 2008 is in line with an overall northward shift of boreal fish species toward the Arctic. This is the first study showing the age class composition, growth rates, and stomach content of Atlantic cod in the shallow water zone of Kongsfjorden, Svalbard. From 2012 to 2014 a total of 721 specimens were sampled in 3 to 12 m water depth. The primary age classes were identified as 0+, 1+, and 2+ using otolith age analysis. The different cohorts of these specimens show stable growth rates during the polar day and night. By stomach content analysis, we show that these specimens primarily feed on benthic food sources. These observations support the assumption that the shallow water zone of Kongsfjorden is likely to be a nursery ground for Atlantic cod. |
| doi_str_mv | 10.1007/s00300-022-03098-1 |
| format | Article |
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The regular catch of juvenile Atlantic cod in Kongsfjorden since 2008 is in line with an overall northward shift of boreal fish species toward the Arctic. This is the first study showing the age class composition, growth rates, and stomach content of Atlantic cod in the shallow water zone of Kongsfjorden, Svalbard. From 2012 to 2014 a total of 721 specimens were sampled in 3 to 12 m water depth. The primary age classes were identified as 0+, 1+, and 2+ using otolith age analysis. The different cohorts of these specimens show stable growth rates during the polar day and night. By stomach content analysis, we show that these specimens primarily feed on benthic food sources. These observations support the assumption that the shallow water zone of Kongsfjorden is likely to be a nursery ground for Atlantic cod.</description><identifier>ISSN: 0722-4060</identifier><identifier>ISSN: 1432-2056</identifier><identifier>EISSN: 1432-2056</identifier><identifier>DOI: 10.1007/s00300-022-03098-1</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer Berlin Heidelberg</publisher><subject>Age ; Analysis ; Benthos ; Biology ; Biomedical and Life Sciences ; Coasts ; Cod ; Cohorts ; Composition ; Content analysis ; Ecology ; Fish ; Fishes ; Food sources ; Growth ; Growth rate ; Juveniles ; Life Sciences ; Marine fishes ; Microbiology ; Nursery grounds ; Oceanography ; Original Paper ; Plant Sciences ; Shallow water ; Stomach ; Stomach content ; Water ; Water depth ; Whitefish ; Year class ; Zoology</subject><ispartof>Polar biology, 2023-01, Vol.46 (1), p.53-65</ispartof><rights>The Author(s) 2022</rights><rights>COPYRIGHT 2023 Springer</rights><rights>The Author(s) 2022. 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The regular catch of juvenile Atlantic cod in Kongsfjorden since 2008 is in line with an overall northward shift of boreal fish species toward the Arctic. This is the first study showing the age class composition, growth rates, and stomach content of Atlantic cod in the shallow water zone of Kongsfjorden, Svalbard. From 2012 to 2014 a total of 721 specimens were sampled in 3 to 12 m water depth. The primary age classes were identified as 0+, 1+, and 2+ using otolith age analysis. The different cohorts of these specimens show stable growth rates during the polar day and night. By stomach content analysis, we show that these specimens primarily feed on benthic food sources. These observations support the assumption that the shallow water zone of Kongsfjorden is likely to be a nursery ground for Atlantic cod.</description><subject>Age</subject><subject>Analysis</subject><subject>Benthos</subject><subject>Biology</subject><subject>Biomedical and Life Sciences</subject><subject>Coasts</subject><subject>Cod</subject><subject>Cohorts</subject><subject>Composition</subject><subject>Content analysis</subject><subject>Ecology</subject><subject>Fish</subject><subject>Fishes</subject><subject>Food sources</subject><subject>Growth</subject><subject>Growth rate</subject><subject>Juveniles</subject><subject>Life Sciences</subject><subject>Marine fishes</subject><subject>Microbiology</subject><subject>Nursery grounds</subject><subject>Oceanography</subject><subject>Original Paper</subject><subject>Plant Sciences</subject><subject>Shallow water</subject><subject>Stomach</subject><subject>Stomach content</subject><subject>Water</subject><subject>Water 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| fulltext | fulltext |
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| ispartof | Polar biology, 2023-01, Vol.46 (1), p.53-65 |
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| source | NORA - Norwegian Open Research Archives; SpringerLink Journals - AutoHoldings |
| subjects | Age Analysis Benthos Biology Biomedical and Life Sciences Coasts Cod Cohorts Composition Content analysis Ecology Fish Fishes Food sources Growth Growth rate Juveniles Life Sciences Marine fishes Microbiology Nursery grounds Oceanography Original Paper Plant Sciences Shallow water Stomach Stomach content Water Water depth Whitefish Year class Zoology |
| title | Age class composition and growth of Atlantic cod (Gadus morhua) in the shallow water zone of Kongsfjorden, Svalbard |
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