New Releases by H. William

Indiana Jones is off to China in search of a priceless jade dragon and the reader must help with choices for the adventure.

The relation of field polarity to fish guiding effectiveness was tested under controlled laboratory conditions by using a single-row electrode array sequentially energized so that: (1) positive polarity was always toward the upstream end, (2) positive polarity was always toward the downstream end, and (3) polarity alternated to cancel out polarity orientation. No difference in effectiveness was found demonstrating that fish guiding was due to avoidance rather than to electrotaxis. Variability, measured as variance, decreased as sample size increased but the mean effectiveness was similar for fish release lots of 15, 50, and 100 fish each.