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Tracking cod Gadus morhua L. in a Scottish sea loch
Author(s) -
Hawkins A. D.,
MacLennan D. N.,
Urquhart G. G.,
Robb C.
Publication year - 1974
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1974.tb04541.x
Subject(s) - gadus , biology , fishery , nocturnal , diel vertical migration , oceanography , transmitter , fish <actinopterygii> , omnidirectional antenna , acoustics , marine engineering , ecology , geology , telecommunications , engineering , channel (broadcasting) , physics , antenna (radio)
Equipment has been developed and used to follow the movements of free‐swimming individual fish in the sea. A pulsed ultrasonic transmitter inserted into the stomach is tracked by measuring differences in the time of arrival of the acoustic pulses at an array of omnidirectional hydrophones. The method was used to plot the movements of cod in an enclosed sea‐loch. After an initial phase of active movement the cod became less mobile and adopted a nocturnal cycle of activity.