AN ULTRASONIC TELEMETRIC SYSTEM FOR AUTOMATIC POSITIONING OF INDIVIDUAL FISH USED TO TRACK ATLANTIC SALMON (SALMO-SALAR L) IN A SEA CAGE

被引：84

作者：

JUELL, JE

WESTERBERG, H

机构：

[1] INST FISHERY TECHNOL RES,N-5024 BERGEN,NORWAY

[2] UNIV GOTHENBURG,DEPT OCEANOG,S-40040 GOTHENBURG,SWEDEN

来源：

AQUACULTURAL ENGINEERING | 1993年 / 12卷 / 01期

关键词：

18;

D O I：

10.1016/0144-8609(93)90023-5

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

A telemetric system for automatic positioning of individual fish in the vertical or horizontal plane is described. The position of a transmitter in a fish is computed from the difference in arrival time of the ultrasonic signal to a fixed array of hydrophones. Sources of error in positioning are discussed. In a preliminary study, the resolution of the system in time and space was adequate to monitor the behaviour of adult salmon in a sea cage. At moderate stocking density the salmon was swimming continually in counter-clockwise circles and diel rhythms in swimming speed, depth and path-radius were observed. With only 30 fish in the cage this stereotype behaviour broke down. Few or no visits into the feeding area during some feedings indicated a variable feeding motivation.

引用

页码：1 / 18

页数：18