Post-release survival and feeding in reared turbot
As part of the Danish restocking program, an experiment was carried out with four groups of turbot Psetta maxima released on two different occasions at the same location in Arhus Bay, Denmark. One objective was to analyse the duration of post-release mortality and the magnitude of this mortality. In...
Published in: | Journal of Sea Research |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2007
|
Subjects: | |
Online Access: | https://orbit.dtu.dk/en/publications/2b114346-412f-4708-8a5f-a47440baf779 https://doi.org/10.1016/j.seares.2006.08.010 |
id |
ftdtupubl:oai:pure.atira.dk:publications/2b114346-412f-4708-8a5f-a47440baf779 |
---|---|
record_format |
openpolar |
spelling |
ftdtupubl:oai:pure.atira.dk:publications/2b114346-412f-4708-8a5f-a47440baf779 2024-03-31T07:55:39+00:00 Post-release survival and feeding in reared turbot Sparrevohn, Claus Reedtz Støttrup, Josianne 2007 https://orbit.dtu.dk/en/publications/2b114346-412f-4708-8a5f-a47440baf779 https://doi.org/10.1016/j.seares.2006.08.010 eng eng https://orbit.dtu.dk/en/publications/2b114346-412f-4708-8a5f-a47440baf779 info:eu-repo/semantics/restrictedAccess Sparrevohn , C R & Støttrup , J 2007 , ' Post-release survival and feeding in reared turbot ' , Journal of Sea Research , vol. 57 , no. 2-3 , pp. 151-161 . https://doi.org/10.1016/j.seares.2006.08.010 Rekreativt fiskeri article 2007 ftdtupubl https://doi.org/10.1016/j.seares.2006.08.010 2024-03-06T00:48:15Z As part of the Danish restocking program, an experiment was carried out with four groups of turbot Psetta maxima released on two different occasions at the same location in Arhus Bay, Denmark. One objective was to analyse the duration of post-release mortality and the magnitude of this mortality. In 2003 a group called Large turbot (17.1[no-break space]cm total length (LT)) and a group called Intermediate (LT = 11.8[no-break space]cm) were released, and in 2004 two similar-sized groups called Naive and Conditioned (LT = 9.8[no-break space]cm) were released. The Conditioned differed from the Naive turbot by being transferred to enclosures at the release location six days prior to the actual release. This experiment was performed to investigate whether such a conditioning period had a positive effect on the survival and hence the success of the stocking. All the groups released were monitored daily until day 8, using a juvenile flatfish-trawl to recapture the fish. The catches were analyzed on the basis of a normal distribution approximation method, founded in diffusion theory, from which daily abundance of the released fish and hence post-release mortality could be estimated. The group of Large turbot suffered negligible post-release mortality, but for the Conditioned, Naive and Intermediate groups the loss varied between 34 and 66% d- 1. The mortality for the Conditioned group was found to be half that of the Naive turbot released simultaneously. The period of high post-release mortality was estimated to be restricted to three days after release. The only active predators observed in the area were birds. Besides estimating mortality the diffusion model provides an estimate on the catchability of the released turbot when fished with a juvenile flatfish-trawl. Catchabilities varied between 38 and 52% for all releases except for the 17[no-break space]cm sized turbot released, where catchability was only 12%. The feeding performance of the released fish was also analysed and compared with that of wild fish caught at ... Article in Journal/Newspaper Turbot Technical University of Denmark: DTU Orbit Journal of Sea Research 57 2-3 151 161 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Rekreativt fiskeri |
spellingShingle |
Rekreativt fiskeri Sparrevohn, Claus Reedtz Støttrup, Josianne Post-release survival and feeding in reared turbot |
topic_facet |
Rekreativt fiskeri |
description |
As part of the Danish restocking program, an experiment was carried out with four groups of turbot Psetta maxima released on two different occasions at the same location in Arhus Bay, Denmark. One objective was to analyse the duration of post-release mortality and the magnitude of this mortality. In 2003 a group called Large turbot (17.1[no-break space]cm total length (LT)) and a group called Intermediate (LT = 11.8[no-break space]cm) were released, and in 2004 two similar-sized groups called Naive and Conditioned (LT = 9.8[no-break space]cm) were released. The Conditioned differed from the Naive turbot by being transferred to enclosures at the release location six days prior to the actual release. This experiment was performed to investigate whether such a conditioning period had a positive effect on the survival and hence the success of the stocking. All the groups released were monitored daily until day 8, using a juvenile flatfish-trawl to recapture the fish. The catches were analyzed on the basis of a normal distribution approximation method, founded in diffusion theory, from which daily abundance of the released fish and hence post-release mortality could be estimated. The group of Large turbot suffered negligible post-release mortality, but for the Conditioned, Naive and Intermediate groups the loss varied between 34 and 66% d- 1. The mortality for the Conditioned group was found to be half that of the Naive turbot released simultaneously. The period of high post-release mortality was estimated to be restricted to three days after release. The only active predators observed in the area were birds. Besides estimating mortality the diffusion model provides an estimate on the catchability of the released turbot when fished with a juvenile flatfish-trawl. Catchabilities varied between 38 and 52% for all releases except for the 17[no-break space]cm sized turbot released, where catchability was only 12%. The feeding performance of the released fish was also analysed and compared with that of wild fish caught at ... |
format |
Article in Journal/Newspaper |
author |
Sparrevohn, Claus Reedtz Støttrup, Josianne |
author_facet |
Sparrevohn, Claus Reedtz Støttrup, Josianne |
author_sort |
Sparrevohn, Claus Reedtz |
title |
Post-release survival and feeding in reared turbot |
title_short |
Post-release survival and feeding in reared turbot |
title_full |
Post-release survival and feeding in reared turbot |
title_fullStr |
Post-release survival and feeding in reared turbot |
title_full_unstemmed |
Post-release survival and feeding in reared turbot |
title_sort |
post-release survival and feeding in reared turbot |
publishDate |
2007 |
url |
https://orbit.dtu.dk/en/publications/2b114346-412f-4708-8a5f-a47440baf779 https://doi.org/10.1016/j.seares.2006.08.010 |
genre |
Turbot |
genre_facet |
Turbot |
op_source |
Sparrevohn , C R & Støttrup , J 2007 , ' Post-release survival and feeding in reared turbot ' , Journal of Sea Research , vol. 57 , no. 2-3 , pp. 151-161 . https://doi.org/10.1016/j.seares.2006.08.010 |
op_relation |
https://orbit.dtu.dk/en/publications/2b114346-412f-4708-8a5f-a47440baf779 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.seares.2006.08.010 |
container_title |
Journal of Sea Research |
container_volume |
57 |
container_issue |
2-3 |
container_start_page |
151 |
op_container_end_page |
161 |
_version_ |
1795037824718733312 |