Prevalence of spinal abnormalities in Chinook salmon smolt and influence of early rearing temperature and growth rates
Abstract Spinal abnormalities can be detected at harvest in around 40% of farmed Chinook salmon in New Zealand. However, whether these abnormalities are present in smolt is unknown. Radiographs of 3,736 smolt were taken immediately prior to transfer to sea water and evaluated for fusions, compressio...
Published in: | Journal of Fish Diseases |
---|---|
Main Authors: | , , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2018
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/jfd.12804 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfd.12804 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfd.12804 |
id |
crwiley:10.1111/jfd.12804 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/jfd.12804 2024-09-09T19:30:45+00:00 Prevalence of spinal abnormalities in Chinook salmon smolt and influence of early rearing temperature and growth rates Munday, J S Perrott, M R Symonds, J E Walker, S P Preece, M A Davie, P S Ministry of Primary Industries 2018 http://dx.doi.org/10.1111/jfd.12804 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfd.12804 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfd.12804 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Diseases volume 41, issue 7, page 1111-1116 ISSN 0140-7775 1365-2761 journal-article 2018 crwiley https://doi.org/10.1111/jfd.12804 2024-06-27T04:21:36Z Abstract Spinal abnormalities can be detected at harvest in around 40% of farmed Chinook salmon in New Zealand. However, whether these abnormalities are present in smolt is unknown. Radiographs of 3,736 smolt were taken immediately prior to transfer to sea water and evaluated for fusions, compressions, vertical shifts, and lordosis, kyphosis and/or scoliosis (LKS). The survey included smolt from two different chilling strategies that had been graded into slow‐ or fast‐growing fish. Overall, 4.34% of Chinook salmon smolt had at least one spinal abnormality, similar to the rates of reported in Atlantic salmon smolt. The rate of abnormality was significantly higher in faster‐growing fish. Fusions were most common with 2.68% of smolt affected. Smolt subjected to longer chilling times had lower rates of fusions. Compressions and vertical shifts were both observed in 1.31% of smolt. Although LKS is the most common abnormality of harvested fish, LKS was detected in just five smolt. The results suggest that some fusions in harvest fish have developed at the time of seawater transfer while LKS develops late in the production cycle. Overall, spinal abnormalities are uncommon in Chinook salmon smolt and may be influenced by chilling times and growth rates. Article in Journal/Newspaper Atlantic salmon Wiley Online Library New Zealand Journal of Fish Diseases 41 7 1111 1116 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Spinal abnormalities can be detected at harvest in around 40% of farmed Chinook salmon in New Zealand. However, whether these abnormalities are present in smolt is unknown. Radiographs of 3,736 smolt were taken immediately prior to transfer to sea water and evaluated for fusions, compressions, vertical shifts, and lordosis, kyphosis and/or scoliosis (LKS). The survey included smolt from two different chilling strategies that had been graded into slow‐ or fast‐growing fish. Overall, 4.34% of Chinook salmon smolt had at least one spinal abnormality, similar to the rates of reported in Atlantic salmon smolt. The rate of abnormality was significantly higher in faster‐growing fish. Fusions were most common with 2.68% of smolt affected. Smolt subjected to longer chilling times had lower rates of fusions. Compressions and vertical shifts were both observed in 1.31% of smolt. Although LKS is the most common abnormality of harvested fish, LKS was detected in just five smolt. The results suggest that some fusions in harvest fish have developed at the time of seawater transfer while LKS develops late in the production cycle. Overall, spinal abnormalities are uncommon in Chinook salmon smolt and may be influenced by chilling times and growth rates. |
author2 |
Ministry of Primary Industries |
format |
Article in Journal/Newspaper |
author |
Munday, J S Perrott, M R Symonds, J E Walker, S P Preece, M A Davie, P S |
spellingShingle |
Munday, J S Perrott, M R Symonds, J E Walker, S P Preece, M A Davie, P S Prevalence of spinal abnormalities in Chinook salmon smolt and influence of early rearing temperature and growth rates |
author_facet |
Munday, J S Perrott, M R Symonds, J E Walker, S P Preece, M A Davie, P S |
author_sort |
Munday, J S |
title |
Prevalence of spinal abnormalities in Chinook salmon smolt and influence of early rearing temperature and growth rates |
title_short |
Prevalence of spinal abnormalities in Chinook salmon smolt and influence of early rearing temperature and growth rates |
title_full |
Prevalence of spinal abnormalities in Chinook salmon smolt and influence of early rearing temperature and growth rates |
title_fullStr |
Prevalence of spinal abnormalities in Chinook salmon smolt and influence of early rearing temperature and growth rates |
title_full_unstemmed |
Prevalence of spinal abnormalities in Chinook salmon smolt and influence of early rearing temperature and growth rates |
title_sort |
prevalence of spinal abnormalities in chinook salmon smolt and influence of early rearing temperature and growth rates |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1111/jfd.12804 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfd.12804 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfd.12804 |
geographic |
New Zealand |
geographic_facet |
New Zealand |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Journal of Fish Diseases volume 41, issue 7, page 1111-1116 ISSN 0140-7775 1365-2761 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/jfd.12804 |
container_title |
Journal of Fish Diseases |
container_volume |
41 |
container_issue |
7 |
container_start_page |
1111 |
op_container_end_page |
1116 |
_version_ |
1809899732869316608 |