Tiny radio frequency identification, or R.F.I.D., tags similar to VeriChip have been embedded in livestock and pets by the millions in recent years as a more secure form of identification than external tags.
No external tags, beacons or cameras are required.
Octopuses are flexible enough to pull out many types of external tag, rendering useless many of the means used to track other cephalopods such as squids [5].
External tags can fall out on their own [6], and those that involve electronics are limited by cost, geographic range and battery power [7], [8].
While external tags frequently use satellite links for data recovery, this is not currently a technically viable option for reasonably sized, fully implanted devices.
MOST+ includes 4 parameters (intensity, kurtosis, asymmetry and clustering) concerning external tag information, 3 (intensity, kurtosis and asymmetry) during ranking phase and the remaining one in the clustering phase.
Sharks remained docile in this position while they were measured, sexed and tagged with an external identification tag (HallprintTM stainless steel dart 'wire through' tags).
Sharks were captured by hook and line fishing, measured, tagged with an external ID tag and surgically implanted with a Vemco RCODE V16 transmitter.
Each captured fish was tagged with an individually-coded, external disk tag (3 cm diameter), a procedure that does not have noticeable effects on survival or breeding behavior [19], [35].
The revenue came primarily from businesses that make external radio tags for keeping track of babies in hospitals and elderly patients in nursing homes — businesses with plenty of competition.
