The squid Gonatus fabricii (Lichtenstein) : Investigations in the Norwegian Sea and western Barents Sea 1982-1983
Investigations on gonatus fabricii (gonatus) in the Norwegian Sea and western Barents Sea continued during June-September 1982 and 1983. Materials were collected with pelagic trawls and from stomach contents of blue ling and Greenland halibut. Dorsal mantle lengths (DML) were mainly 20-50 mm, extrem...
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ftimr:oai:imr.brage.unit.no:11250/102064 2023-05-15T15:38:53+02:00 The squid Gonatus fabricii (Lichtenstein) : Investigations in the Norwegian Sea and western Barents Sea 1982-1983 Wiborg, Kristian Fredrik Gjøsæter, Jakob Beck, Inger Marie 1984 application/pdf http://hdl.handle.net/11250/102064 eng eng ICES ICES CM documents;1984/K:19 This report is not to be quoted without prior consultation with the General Secretary. http://hdl.handle.net/11250/102064 14 s. squid blekksprut VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Working paper 1984 ftimr 2021-09-23T20:15:20Z Investigations on gonatus fabricii (gonatus) in the Norwegian Sea and western Barents Sea continued during June-September 1982 and 1983. Materials were collected with pelagic trawls and from stomach contents of blue ling and Greenland halibut. Dorsal mantle lengths (DML) were mainly 20-50 mm, extremes 10 mm and 100 mm. Larger gonatus, DML 80-200 mm, were taken in deep pelagic and bottom hauls at 200-400 m. Gonatus with DML 95-255 mm were the main contents in stomachs of blue ling and Greenland halibut fished in April-June on the continental slope off western Norway. Age and growth were estimated from counts of primary growth rings in the statoliths. In the juveniles, linear relations were found between DML and number of growth rings, but with varying slopes of the regression lines, and correlation coefficients, r, varying from 0.47 to 0.67. In larger gonatus, the regression curve had a sigmoid shape. The assumption that larger gonatus, having. left the surface layers, grow considerably faster than the juveniles, seems to be confirmed. The relationship between total statolith length .(TLS) and DML, both in mm, was calculated for various length groups with the following results: DML 10-250 mm: TLS = 0.131 DML 0.47, n = 201, r²=0.93 DML 10- 69 mm: TLS = 0.104 DML 0.53, n = 163, r²=0.93 DML 70-250 mm: TLS = 0.328 DML 0.26, n = 38, r²=0.74 There is a considerable change in the relationship for DML longer than 70 mm, indicating a slower growth of the stato1iths. The main spawning period seems to be from December to April, on, or near the bottom in 300-700 m depth or more on the continental slopes of the Norwegian Sea, from the west coast of Norway to West-Spitsbergen, and westwards to Iceland and Jan Mayen. The food of juvenile gonatus was dominated by amphipods, Parathemisto sp., but copepods, chaetognaths, euphausiids, pteropods and Pasiphaea sp. were also identified. Larger gonatus also take fry of redfish and pearlside, and smaller gonatus. Report Barents Sea DML Greenland Iceland Jan Mayen Norwegian Sea Copepods Spitsbergen Institute for Marine Research: Brage IMR Barents Sea Greenland Jan Mayen Norway Norwegian Sea |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
squid blekksprut VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 |
spellingShingle |
squid blekksprut VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Wiborg, Kristian Fredrik Gjøsæter, Jakob Beck, Inger Marie The squid Gonatus fabricii (Lichtenstein) : Investigations in the Norwegian Sea and western Barents Sea 1982-1983 |
topic_facet |
squid blekksprut VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 |
description |
Investigations on gonatus fabricii (gonatus) in the Norwegian Sea and western Barents Sea continued during June-September 1982 and 1983. Materials were collected with pelagic trawls and from stomach contents of blue ling and Greenland halibut. Dorsal mantle lengths (DML) were mainly 20-50 mm, extremes 10 mm and 100 mm. Larger gonatus, DML 80-200 mm, were taken in deep pelagic and bottom hauls at 200-400 m. Gonatus with DML 95-255 mm were the main contents in stomachs of blue ling and Greenland halibut fished in April-June on the continental slope off western Norway. Age and growth were estimated from counts of primary growth rings in the statoliths. In the juveniles, linear relations were found between DML and number of growth rings, but with varying slopes of the regression lines, and correlation coefficients, r, varying from 0.47 to 0.67. In larger gonatus, the regression curve had a sigmoid shape. The assumption that larger gonatus, having. left the surface layers, grow considerably faster than the juveniles, seems to be confirmed. The relationship between total statolith length .(TLS) and DML, both in mm, was calculated for various length groups with the following results: DML 10-250 mm: TLS = 0.131 DML 0.47, n = 201, r²=0.93 DML 10- 69 mm: TLS = 0.104 DML 0.53, n = 163, r²=0.93 DML 70-250 mm: TLS = 0.328 DML 0.26, n = 38, r²=0.74 There is a considerable change in the relationship for DML longer than 70 mm, indicating a slower growth of the stato1iths. The main spawning period seems to be from December to April, on, or near the bottom in 300-700 m depth or more on the continental slopes of the Norwegian Sea, from the west coast of Norway to West-Spitsbergen, and westwards to Iceland and Jan Mayen. The food of juvenile gonatus was dominated by amphipods, Parathemisto sp., but copepods, chaetognaths, euphausiids, pteropods and Pasiphaea sp. were also identified. Larger gonatus also take fry of redfish and pearlside, and smaller gonatus. |
format |
Report |
author |
Wiborg, Kristian Fredrik Gjøsæter, Jakob Beck, Inger Marie |
author_facet |
Wiborg, Kristian Fredrik Gjøsæter, Jakob Beck, Inger Marie |
author_sort |
Wiborg, Kristian Fredrik |
title |
The squid Gonatus fabricii (Lichtenstein) : Investigations in the Norwegian Sea and western Barents Sea 1982-1983 |
title_short |
The squid Gonatus fabricii (Lichtenstein) : Investigations in the Norwegian Sea and western Barents Sea 1982-1983 |
title_full |
The squid Gonatus fabricii (Lichtenstein) : Investigations in the Norwegian Sea and western Barents Sea 1982-1983 |
title_fullStr |
The squid Gonatus fabricii (Lichtenstein) : Investigations in the Norwegian Sea and western Barents Sea 1982-1983 |
title_full_unstemmed |
The squid Gonatus fabricii (Lichtenstein) : Investigations in the Norwegian Sea and western Barents Sea 1982-1983 |
title_sort |
squid gonatus fabricii (lichtenstein) : investigations in the norwegian sea and western barents sea 1982-1983 |
publisher |
ICES |
publishDate |
1984 |
url |
http://hdl.handle.net/11250/102064 |
geographic |
Barents Sea Greenland Jan Mayen Norway Norwegian Sea |
geographic_facet |
Barents Sea Greenland Jan Mayen Norway Norwegian Sea |
genre |
Barents Sea DML Greenland Iceland Jan Mayen Norwegian Sea Copepods Spitsbergen |
genre_facet |
Barents Sea DML Greenland Iceland Jan Mayen Norwegian Sea Copepods Spitsbergen |
op_source |
14 s. |
op_relation |
ICES CM documents;1984/K:19 This report is not to be quoted without prior consultation with the General Secretary. http://hdl.handle.net/11250/102064 |
_version_ |
1766370290831458304 |