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Table 1 Summary of results from a laboratory study of retention and expulsion of oviduct transmitters in female lake trout

From: Use of oviduct-inserted acoustic transmitters and positional telemetry to estimate timing and location of spawning: a feasibility study in lake trout, Salvelinus namaycush

Stage Inserted Implanted
Initial sample size (N) 22 22
Retained oviduct transmitter until end of spawning period 18 (82%) 21 (95%)
Became ovulatory (ripened) 17 (94%) 18 (86%)
Percent of ripe trout that expelled transmitter with eggs 15 (88%) 16 (89%)
Percent of total trout that expelled transmitter with eggs 68% 73%
  1. Oviduct transmitters were either ‘inserted’ into the body cavity via the oviduct or ‘implanted’ surgically just anterior to the genital pore. Values are the number of lake trout that reached each stage and percentages in parentheses are based on the number of lake trout that made it to the previous stage.