Fish tracking label for predation detection

摘要

Label (104, 200, 300, 400, 500, 600, 700, 800, 902, 1002, 1102, 1230, 1304) for monitoring an aquatic animal comprising: a sensor (204, 304, 404, 504a-b , 608a-b, 810, 1014, 1104, 1234) to detect a characteristic of the tag; a pH sensitive material (210a, 310, 410a, 506a, 610a, 710a, 808a) exposed to an external environment of the label, the pH sensitive material degrading in the presence of an acidic environment, causing degradation of the pH sensitive material a detectable change in a characteristic of the label detected by the sensor; and a transducer (1010, 1218) to transmit an ultrasonic signal on the basis of at least the detection of the characteristic of the tag by the sensor.