The probability of cod (Gadus morhua) and ling (Molva molva) to encounter gillnets based on in situ fish movements

The probability of cod (Gadus morhua) and ling (Molva molva) to encounter a fleet of four gillnets (110m) set within a fixed survey area of 600x600 m2 and soaked for a period of 12 h (1800-0600 hrs) is calculated on the basis of in situ observations of fish movement and random simulated start positi...

Full description

Bibliographic Details
Main Authors: Engås, Arill, Jørgensen, Terje
Format: Report
Language:English
Published: ICES 1997
Subjects:
cod
torsk
ling
lange
gill net
garn
fish behaviour
fiskeatferd
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ethology: 485
VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925
Garn
Gadus morhua
Online Access:http://hdl.handle.net/11250/105773
Description
Summary:The probability of cod (Gadus morhua) and ling (Molva molva) to encounter a fleet of four gillnets (110m) set within a fixed survey area of 600x600 m2 and soaked for a period of 12 h (1800-0600 hrs) is calculated on the basis of in situ observations of fish movement and random simulated start positions and setting directions of a fleet of gillnets. The movements of cod and ling, which were tagged by allowing them to voluntarily swallow bait-wrapped transmitters close to the sea bed, were studied by means of a stationary positioning system. The expected number of encounters per fish for the fleet of gillnets varied between 0.127 and 0.626 for cod and 0.077 and 0.614 for ling with a fish density of three fish per 0,1 (n.mile)^2 .

Similar Items