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Sex identification and PIT-tagging: tools and prospects for studying intersexual differences in freshwater fishes.

Hulthén, Kaj LU ; Chapman, Ben LU ; Nilsson, Anders LU ; Hansson, Lars-Anders LU ; Skov, C; Baktoft, H; Brodersen, J and Brönmark, Christer LU (2014) In Journal of Fish Biology 84(2). p.503-512
Abstract
This study evaluated a technique to allow the long-term monitoring of individual fishes of known sex in the wild using sex confirmation in close proximity to the reproductive period combined with individual tagging. Hundreds of partially migratory roach Rutilus rutilus were tagged with passive integrated transponders (PIT) following sex determination in spring and various performance measures were compared with fish tagged outside the reproductive period in autumn. Short-term survival was >95% for R. rutilus sexed and tagged under natural field conditions. Total length (LT ) did not affect the probability of survival within the size range tagged (119-280 mm), nor were there differences in timing of migration the following season between... (More)
This study evaluated a technique to allow the long-term monitoring of individual fishes of known sex in the wild using sex confirmation in close proximity to the reproductive period combined with individual tagging. Hundreds of partially migratory roach Rutilus rutilus were tagged with passive integrated transponders (PIT) following sex determination in spring and various performance measures were compared with fish tagged outside the reproductive period in autumn. Short-term survival was >95% for R. rutilus sexed and tagged under natural field conditions. Total length (LT ) did not affect the probability of survival within the size range tagged (119-280 mm), nor were there differences in timing of migration the following season between individuals sexed and tagged in spring and individuals tagged in autumn (i.e. outside the reproductive period). Also, a similar per cent of R. rutilus sexed and tagged in spring and tagged in autumn migrated the following season (34·5 and 34·7%). Moreover, long-term recapture data revealed no significant differences in body condition between R. rutilus individuals sexed and tagged in spring, individuals tagged in autumn and unmanipulated individuals. The observed sex ratio of recaptured fish did not differ from the expected values of equal recapture rates between males and females. Hence, there is no observable evidence for an adverse effect of tagging close to the reproductive period and therefore this method is suitable for studying intersexual differences and other phenotypic traits temporarily expressed during reproduction at the individual level in fishes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Fish Biology
volume
84
issue
2
pages
503 - 512
publisher
Wiley-Blackwell
external identifiers
  • pmid:24490936
  • wos:000336083200016
  • scopus:84893344954
ISSN
0022-1112
DOI
10.1111/jfb.12300
project
CAnMove
BECC
language
English
LU publication?
yes
id
4d86e129-e5f1-48f5-bb4f-5cdbc8ac0015 (old id 4335769)
date added to LUP
2014-03-26 13:41:15
date last changed
2017-07-23 03:27:36
@article{4d86e129-e5f1-48f5-bb4f-5cdbc8ac0015,
  abstract     = {This study evaluated a technique to allow the long-term monitoring of individual fishes of known sex in the wild using sex confirmation in close proximity to the reproductive period combined with individual tagging. Hundreds of partially migratory roach Rutilus rutilus were tagged with passive integrated transponders (PIT) following sex determination in spring and various performance measures were compared with fish tagged outside the reproductive period in autumn. Short-term survival was >95% for R. rutilus sexed and tagged under natural field conditions. Total length (LT ) did not affect the probability of survival within the size range tagged (119-280 mm), nor were there differences in timing of migration the following season between individuals sexed and tagged in spring and individuals tagged in autumn (i.e. outside the reproductive period). Also, a similar per cent of R. rutilus sexed and tagged in spring and tagged in autumn migrated the following season (34·5 and 34·7%). Moreover, long-term recapture data revealed no significant differences in body condition between R. rutilus individuals sexed and tagged in spring, individuals tagged in autumn and unmanipulated individuals. The observed sex ratio of recaptured fish did not differ from the expected values of equal recapture rates between males and females. Hence, there is no observable evidence for an adverse effect of tagging close to the reproductive period and therefore this method is suitable for studying intersexual differences and other phenotypic traits temporarily expressed during reproduction at the individual level in fishes.},
  author       = {Hulthén, Kaj and Chapman, Ben and Nilsson, Anders and Hansson, Lars-Anders and Skov, C and Baktoft, H and Brodersen, J and Brönmark, Christer},
  issn         = {0022-1112},
  language     = {eng},
  number       = {2},
  pages        = {503--512},
  publisher    = {Wiley-Blackwell},
  series       = {Journal of Fish Biology},
  title        = {Sex identification and PIT-tagging: tools and prospects for studying intersexual differences in freshwater fishes.},
  url          = {http://dx.doi.org/10.1111/jfb.12300},
  volume       = {84},
  year         = {2014},
}