Norske pigghåmerkinger 1958-61

The Norwegian taggings of spiny dogfish are considered for the period 1958-61. The main results are that: a) there exists a regular migration between the British Isles (summer) and the Norwegian coastal waters (winter) and vice versa. There are some notable exceptions to this simple rule. b) the tot...

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Bibliographic Details
Main Author: Aasen, Olav
Format: Article in Journal/Newspaper
Language:Norwegian Bokmål
Published: Havforskningsinstituttet 1962
Subjects:
spiny dogfish
pigghå
mortality
dødelighet
tagging
merking
migration patterns
vandringsmønster
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921
Online Access:http://hdl.handle.net/11250/113779
Description
Summary:The Norwegian taggings of spiny dogfish are considered for the period 1958-61. The main results are that: a) there exists a regular migration between the British Isles (summer) and the Norwegian coastal waters (winter) and vice versa. There are some notable exceptions to this simple rule. b) the total yearly mortality rate in the stock of spiny dogfish in the waters concerned are calculated to be 25 %. This is not considered a disturbing figure with respect to the level of the stock. c) the investigations of the spiny dogfish in the Norwegian fjords seem to show that these most likely will have to be considered as strays from the main oceanic stock.

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