Prespawning migratory behaviour and spawning success of sea-ranched Atlantic salmon, Salmo salar L., in the River Gudenaa, Denmark
The migratory behaviour of sea-ranched Atlantic salmon, Salmo salar L., was analysed by radio-telemetry in the River Gudenaa, Denmark. The main objectives were to: (1) estimate mortality of returning adults through the fjord; (2) observe rate of progression and migratory pattern in the fjord and riv...
Main Authors: | , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2000
|
Subjects: | |
Online Access: | https://orbit.dtu.dk/en/publications/dc662da7-9fe8-43c9-885d-00ac9387464a |
id |
ftdtupubl:oai:pure.atira.dk:publications/dc662da7-9fe8-43c9-885d-00ac9387464a |
---|---|
record_format |
openpolar |
spelling |
ftdtupubl:oai:pure.atira.dk:publications/dc662da7-9fe8-43c9-885d-00ac9387464a 2024-05-19T07:37:41+00:00 Prespawning migratory behaviour and spawning success of sea-ranched Atlantic salmon, Salmo salar L., in the River Gudenaa, Denmark Aarestrup, Kim Jepsen, Niels Rasmusssen, Gorm Økland, F. Thorstad, E.B. Holdensgaard, G. 2000 https://orbit.dtu.dk/en/publications/dc662da7-9fe8-43c9-885d-00ac9387464a eng eng https://orbit.dtu.dk/en/publications/dc662da7-9fe8-43c9-885d-00ac9387464a info:eu-repo/semantics/restrictedAccess Aarestrup , K , Jepsen , N , Rasmusssen , G , Økland , F , Thorstad , E B & Holdensgaard , G 2000 , ' Prespawning migratory behaviour and spawning success of sea-ranched Atlantic salmon, Salmo salar L., in the River Gudenaa, Denmark ' , Fisheries Management and Ecology , vol. 7 , no. 5 , pp. 387-400 . Habitat og klima article 2000 ftdtupubl 2024-05-01T00:13:55Z The migratory behaviour of sea-ranched Atlantic salmon, Salmo salar L., was analysed by radio-telemetry in the River Gudenaa, Denmark. The main objectives were to: (1) estimate mortality of returning adults through the fjord; (2) observe rate of progression and migratory pattern in the fjord and river; and (3) record whether spawning occurs in the river. Forty-two returning salmon (19 males and 23 females of total body length from 60-97 cm) reared and released as smolts, were caught and equipped with external radio transmitters in the outer estuary of the River Gudenaa in 1994 and 1995. Of the tagged salmon, 18 (43%) were caught in the estuary, four (10%) were not recorded after release and 20 (47%) entered the river. The mean rate of progression through the fjord was 7.6 km d(-1) (range 1.4-18.2) in 1994 and 5.4 km d(-1) (range 1.6-17.1) in 1995. Eleven salmon were alive at the onset of the spawning period. Eight were retrieved dead from the river during or after the spawning period; four with empty gonads assumed to be successful spawners, and four with intact gonads. In 1994, unsuccessful spawners (found dead with intact gonads) entered the river earlier and had a longer total migration distance in the river compared to successful. spawners. This suggests that spawning success of sea-ranched salmon is associated with time of river entry and river migration length Article in Journal/Newspaper Atlantic salmon Salmo salar Technical University of Denmark: DTU Orbit |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Habitat og klima |
spellingShingle |
Habitat og klima Aarestrup, Kim Jepsen, Niels Rasmusssen, Gorm Økland, F. Thorstad, E.B. Holdensgaard, G. Prespawning migratory behaviour and spawning success of sea-ranched Atlantic salmon, Salmo salar L., in the River Gudenaa, Denmark |
topic_facet |
Habitat og klima |
description |
The migratory behaviour of sea-ranched Atlantic salmon, Salmo salar L., was analysed by radio-telemetry in the River Gudenaa, Denmark. The main objectives were to: (1) estimate mortality of returning adults through the fjord; (2) observe rate of progression and migratory pattern in the fjord and river; and (3) record whether spawning occurs in the river. Forty-two returning salmon (19 males and 23 females of total body length from 60-97 cm) reared and released as smolts, were caught and equipped with external radio transmitters in the outer estuary of the River Gudenaa in 1994 and 1995. Of the tagged salmon, 18 (43%) were caught in the estuary, four (10%) were not recorded after release and 20 (47%) entered the river. The mean rate of progression through the fjord was 7.6 km d(-1) (range 1.4-18.2) in 1994 and 5.4 km d(-1) (range 1.6-17.1) in 1995. Eleven salmon were alive at the onset of the spawning period. Eight were retrieved dead from the river during or after the spawning period; four with empty gonads assumed to be successful spawners, and four with intact gonads. In 1994, unsuccessful spawners (found dead with intact gonads) entered the river earlier and had a longer total migration distance in the river compared to successful. spawners. This suggests that spawning success of sea-ranched salmon is associated with time of river entry and river migration length |
format |
Article in Journal/Newspaper |
author |
Aarestrup, Kim Jepsen, Niels Rasmusssen, Gorm Økland, F. Thorstad, E.B. Holdensgaard, G. |
author_facet |
Aarestrup, Kim Jepsen, Niels Rasmusssen, Gorm Økland, F. Thorstad, E.B. Holdensgaard, G. |
author_sort |
Aarestrup, Kim |
title |
Prespawning migratory behaviour and spawning success of sea-ranched Atlantic salmon, Salmo salar L., in the River Gudenaa, Denmark |
title_short |
Prespawning migratory behaviour and spawning success of sea-ranched Atlantic salmon, Salmo salar L., in the River Gudenaa, Denmark |
title_full |
Prespawning migratory behaviour and spawning success of sea-ranched Atlantic salmon, Salmo salar L., in the River Gudenaa, Denmark |
title_fullStr |
Prespawning migratory behaviour and spawning success of sea-ranched Atlantic salmon, Salmo salar L., in the River Gudenaa, Denmark |
title_full_unstemmed |
Prespawning migratory behaviour and spawning success of sea-ranched Atlantic salmon, Salmo salar L., in the River Gudenaa, Denmark |
title_sort |
prespawning migratory behaviour and spawning success of sea-ranched atlantic salmon, salmo salar l., in the river gudenaa, denmark |
publishDate |
2000 |
url |
https://orbit.dtu.dk/en/publications/dc662da7-9fe8-43c9-885d-00ac9387464a |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Aarestrup , K , Jepsen , N , Rasmusssen , G , Økland , F , Thorstad , E B & Holdensgaard , G 2000 , ' Prespawning migratory behaviour and spawning success of sea-ranched Atlantic salmon, Salmo salar L., in the River Gudenaa, Denmark ' , Fisheries Management and Ecology , vol. 7 , no. 5 , pp. 387-400 . |
op_relation |
https://orbit.dtu.dk/en/publications/dc662da7-9fe8-43c9-885d-00ac9387464a |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1799477029678088192 |