DART PIT Tag Life Stage Filter

The DART Life Stage Filter is currently under review; we expect to update and implement version 2.0 by end of 2025.

DART categorizes PIT Tag observations into three stages: Adult, Juvenile, and Unknown. A life-stage of Adult, Juvenile, or Unknown is assigned to each salmonid PIT Tag detection using PTAGIS data specifications of migration year, release year, release length, observation year, release site, capture method, tagging comments, detection sequences, travel time, detection location and other criteria to determine the stage of the PIT-tagged fish at the time of the detection. The PTAGIS observation data set is an extremely useful resource for monitoring and analyzing the life history and migration patterns of Columbia Basin salmonids. Attaching a life-stage designation (Adult, Juvenile, Unknown) to a PIT tag detection increases the utility of the dataset and allows additional analyses including conversion rates and stray patterns. The DART life stage filter combines the tagging, interrogation, and recapture datasets to determine the life stage at tagging and each subsequent observation. The DART definition of adult is a sexually mature, upstream migrant including precocious, mini-jack, and jack fish.