Abstract
Abstract A study was conducted to determine if the threatened Guadalupe bass (Micropterus treculi) could adapt to fish hatchery production. Five hormone-injected fish (one female and four males) stocked in a 0.04-hectare spawning pond produced about 1,200 harvestable fingerlings. The fish were size-graded into three classes and stocked into indoor rectangular tanks. Fingerlings, 22-45 mm total length and 0.32-1.02 g, were trained to consume formulated feed in a simulated production environment. They received 1.0-1.5-mm-diameter semi-moist pellets at a rate greater than 48% of the stocked biomass per day throughout the 24-d training period. Training success for the three size classes was 96.4, 97.6, and 100.0%. Growth rates during and following training were similar to those of other Micropterus species. These results indicate that the Guadalupe bass will adapt to fish hatchery conditions and can be produced to supplement depleted native populations.
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