• norsk
    • English
  • English 
    • norsk
    • English
  • Login
View Item 
  •   Home
  • Havforskningsinstituttet
  • Published in cooperation with others
  • ICES CM documents authored by IMR scientists (1949-2011)
  • View Item
  •   Home
  • Havforskningsinstituttet
  • Published in cooperation with others
  • ICES CM documents authored by IMR scientists (1949-2011)
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Vulnerability to predation of small cod (Gadus morhua) that escape from a trawl

Løkkeborg, Svein; Soldal, Aud Vold
Working paper
Thumbnail
View/Open
CM_1995_B_15.pdf (976.8Kb)
URI
http://hdl.handle.net/11250/105419
Date
1995
Metadata
Show full item record
Collections
  • ICES CM documents authored by IMR scientists (1949-2011) [3138]
Original version
This report is not to be cited without prior reference to the authors  
Abstract
Studies of the vulnerability to gear damage of fish that have been caught in a trawl but have

escaped through the codend meshes have focussed on determining survival rates. This study

examines the risk of predation in small cod (Gadus morhua) (18.2 cm mean total length)

escaping a small-scale trawl. Trawling was simulated in a circular tank by towing a small

mock-up of a trawl (70 mm codend meshes) for 30 minutes. Escaped fish were retained in

a small-meshed net (16 mm) covering the codend. After each towing period, three or four of

these fish and the same number of fish from a control group were immediately transferred to

a tank holding five large. cod (56.3 cm mean total length). Predation by the large cod was

recorded for 30 min or until 50% of the small cod had been taken. In a total of nine

experiments, equal numbers of escaping fish and fish from the control group were eaten by

the large cod. This indicates that small cod escaping from a trawl do not have increased risk

of predation under these experimental conditions. However, the stressed fish were not

physically exhausted and the predation experiment was conducted under conditions where the

predator could easily capture both stressed and control fish.
Publisher
ICES
Series
ICES CM Documents;1995/B:15

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit
 

 

Browse

ArchiveCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsDocument TypesJournalsThis CollectionBy Issue DateAuthorsTitlesSubjectsDocument TypesJournals

My Account

Login

Statistics

View Usage Statistics

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit