Document Detail

Smoltification induced by a 'skeleton' photoperiod in underyearling coho salmon (Oncorhynchus kisutch).
MedLine Citation:
PMID:  24226896     Owner:  NLM     Status:  In-Data-Review    
Underyearling coho salmon fry were subjected to three initial photoperiod treatments (6L∶18D, 10L∶14D, 14L∶10D) for two months and subsequently to three final treatments (16L∶8D, 9L∶6D∶1L∶8D, 10L∶14D) in a factorial design. Growth rates and seawater adaptability were monitored regularly. The groups that were exposed initially to 6L∶18D or 10L∶14D and then to 16L∶8D grew faster and had lower plasma sodium ion levels after seawater challenge tests than any of the other groups. Fish which were initially exposed to 6 L or 10 L daylength and then to a 9L∶6D∶1L∶8D skeleton photoperiod, showed a slightly lower growth rate and seawater adaptability than those given the corresponding complete 16L∶8D photoperiod. However fish maintained on skeleton photoperiods had significantly greater growth rates and seawater adaptability than those kept on the 10L∶14D photoperiod. This indicates that it is not the accumulated number of hours of exposure to light that initiates smolting, but rather the time during the day when light is experienced. Fish exposed initially to 14L∶10D showed little or no response to subsequent changes in photoperiod, suggesting that responsiveness to inductive photoperiods depends on the initial photoperiod treatment.
H Thorarensen; W C Clarke
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Fish physiology and biochemistry     Volume:  6     ISSN:  0920-1742     ISO Abbreviation:  Fish Physiol. Biochem.     Publication Date:  1989 Jan 
Date Detail:
Created Date:  2013-11-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100955049     Medline TA:  Fish Physiol Biochem     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  11-8     Citation Subset:  -    
Department of Biological Sciences, Simon Fraser University, V5A 1S6, Burnaby, B.C., Canada.
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