Recordings of mature Gonatus fabricii (Lichtenstein) off the Norwegian coast
Two mature female and three mature males were sampled by trawling with a pelagic trawl at depths of more than 800 m off northem Norway. A third female were sampled with bottom trawl at 970 m off mid Norway. The females had a flabby, swollen appearance and degenerated tentacles and from 5 to 12 matur...
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ftimr:oai:imr.brage.unit.no:11250/105633 2023-05-15T16:01:47+02:00 Recordings of mature Gonatus fabricii (Lichtenstein) off the Norwegian coast Bjørke, Herman Hansen, Karsten 1996 application/pdf http://hdl.handle.net/11250/105633 eng eng ICES ICES CM Documents;1996/K:17 This report is not to be cited without prior reference to the authors http://hdl.handle.net/11250/105633 12 s. squid akkar spawning gyting maturation modning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 Working paper 1996 ftimr 2021-09-23T20:15:26Z Two mature female and three mature males were sampled by trawling with a pelagic trawl at depths of more than 800 m off northem Norway. A third female were sampled with bottom trawl at 970 m off mid Norway. The females had a flabby, swollen appearance and degenerated tentacles and from 5 to 12 mature eggs on the ovary. The mature eggs had a largest diameter varying from 4 to 6 mm. The females were all larger than the mature males and the smallest had a DML of 260 mm. The females seems to mature at lengths between 200 and 250 mm. The mature males had spermatophores, 7 to 9 mm long, in the spermatophoric sac and in the penis, showing that they had not copulated. The smallest male had a DML of 190 mm. The males seems to mature at smaller length than the females. Assuming the same growth rate as observed at West Greenland, Gonatus fabricii seems to mature at an age of 2 to 2,5 years. Other recordings of larger mature males could indicate a second mating at an age of three years. The recordings of mature females at bottom indicate spawning at bottom. Recordings of mature females from summer to end of November indicate that spawning takes at least place during this period. The recordings of mature females at bottom indicate spawning at bottom. Recordings of mature females with emty spermatophores more than 500 m above bottom arise questions of a second mating or pelagic spawning. Report DML Greenland Institute for Marine Research: Brage IMR Greenland Norway |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
squid akkar spawning gyting maturation modning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 |
spellingShingle |
squid akkar spawning gyting maturation modning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 Bjørke, Herman Hansen, Karsten Recordings of mature Gonatus fabricii (Lichtenstein) off the Norwegian coast |
topic_facet |
squid akkar spawning gyting maturation modning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 |
description |
Two mature female and three mature males were sampled by trawling with a pelagic trawl at depths of more than 800 m off northem Norway. A third female were sampled with bottom trawl at 970 m off mid Norway. The females had a flabby, swollen appearance and degenerated tentacles and from 5 to 12 mature eggs on the ovary. The mature eggs had a largest diameter varying from 4 to 6 mm. The females were all larger than the mature males and the smallest had a DML of 260 mm. The females seems to mature at lengths between 200 and 250 mm. The mature males had spermatophores, 7 to 9 mm long, in the spermatophoric sac and in the penis, showing that they had not copulated. The smallest male had a DML of 190 mm. The males seems to mature at smaller length than the females. Assuming the same growth rate as observed at West Greenland, Gonatus fabricii seems to mature at an age of 2 to 2,5 years. Other recordings of larger mature males could indicate a second mating at an age of three years. The recordings of mature females at bottom indicate spawning at bottom. Recordings of mature females from summer to end of November indicate that spawning takes at least place during this period. The recordings of mature females at bottom indicate spawning at bottom. Recordings of mature females with emty spermatophores more than 500 m above bottom arise questions of a second mating or pelagic spawning. |
format |
Report |
author |
Bjørke, Herman Hansen, Karsten |
author_facet |
Bjørke, Herman Hansen, Karsten |
author_sort |
Bjørke, Herman |
title |
Recordings of mature Gonatus fabricii (Lichtenstein) off the Norwegian coast |
title_short |
Recordings of mature Gonatus fabricii (Lichtenstein) off the Norwegian coast |
title_full |
Recordings of mature Gonatus fabricii (Lichtenstein) off the Norwegian coast |
title_fullStr |
Recordings of mature Gonatus fabricii (Lichtenstein) off the Norwegian coast |
title_full_unstemmed |
Recordings of mature Gonatus fabricii (Lichtenstein) off the Norwegian coast |
title_sort |
recordings of mature gonatus fabricii (lichtenstein) off the norwegian coast |
publisher |
ICES |
publishDate |
1996 |
url |
http://hdl.handle.net/11250/105633 |
geographic |
Greenland Norway |
geographic_facet |
Greenland Norway |
genre |
DML Greenland |
genre_facet |
DML Greenland |
op_source |
12 s. |
op_relation |
ICES CM Documents;1996/K:17 This report is not to be cited without prior reference to the authors http://hdl.handle.net/11250/105633 |
_version_ |
1766397511127269376 |