Abstract
AbstractA commercially feasible indoor hatching system for fathead minnow Pimephales promelas requires an efficient egg collection process that maximizes egg numbers while minimizing spawning substrate. Four ratios of substrate area to the number of male fathead minnow were compared by stocking approximately 40 males and 80 females into each of sixteen 3.3‐m2 outdoor pools to determine the volume of eggs that could be collected every 2–3 d. No differences in mean egg volume were found among the three lowest ratios of substrate area to the number of males (85, 170, and 255 cm2), and egg volume did not differ between the lowest (85 cm2) and highest (340 cm2) ratios, indicating that 85 cm2 of spawning substrate per male was sufficient. On average, less than one‐third of the males were nesting at any one time. These results strongly suggest that lower spawning substrate area : male ratios should be tested to further refine this new hatchery method.
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