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<br />------------------- <br /> <br />SAN JUAN RIVER <br />COLORADO PIKEMINNOW POPULATION ESTIMATE <br />. PROBLEMS AND THINGS TO REMEMBER! <br /> <br />. The estimate models used assume a 00/0 mortality factor <br />- We know that this is not true in real life <br />- There was one confirmed mortality during our study <br /> <br />. Three individual Colorado pikeminnow were observed (via radio <br />telemetry) to actively avoid both electrofishing boats and trammel <br />nets <br />- It is my belief that repeated sampling (especially electrofishing) tends <br />to train this species to avoid capture <br />- When fish are very rare to begin with and they cannot be trapped <br />in off-channel habitats (backwaters, etc.), which the San Juan <br />lacks, they become very hard to sample, thus making accurate <br />population estimates difficu.lt to obtain <br />