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Environmental Monitoring

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Articles 151 - 152 of 152

Full-Text Articles in Marine Biology

Ultrasonic Shark Tag Monitoring System Technical Report, Thomas Thorson, Gordon Esterberg, James Johnson Jun 1969

Ultrasonic Shark Tag Monitoring System Technical Report, Thomas Thorson, Gordon Esterberg, James Johnson

School of Biological Sciences: Faculty Publications

Table of Contents:
Introduction
Description of System
Ultrasonic Tag
Ultrasonic Tag Monitor
Hyrdophones
Receiver-Recorder Unit
Receiver
Recorder
Batteries
Operation
Figures
Distribution List
Documentation Control Data – R & D (DD Form 1473)


Fisheries Report Ii (2) - Preliminary Report On The Effectiveness Of Escape-Gaps In Crayfish-Pots, B. K. Bowen Jan 1963

Fisheries Report Ii (2) - Preliminary Report On The Effectiveness Of Escape-Gaps In Crayfish-Pots, B. K. Bowen

Fisheries Research Reports

The Western Australian commercial crayfish, Panulinrus cy,nus George, (1962)", is caught in depths ranging from a few feet to approximately 45 fathoms. In the shallow waters large numbers of crayfish measuring, less than the legal minimum length are brought to the surface in the standard commercial crayfish pots. The law requires that these undersize crayfish be returned to the sea, but there is always the temptation to retain them for illegal sale. In addition, the undersize crayfish which are returned to the sea are often damaged by handling. The probability is that their mortality rate is higher than those which …