Word: gambusia
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Dates: during 1940-1949
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...Mollies in his aquarium, transferring the stock to La Jolla by airplane in thermos bottles. Never did he find a male, and none of the females produced by heterogeneous mating with alien fish showed any traits inherited from their fathers. Even when he mated a Molly with a male Gambusia (by artificial insemination), her offspring were female. Dr. Hubbs even tried to create artificial male Mollies-with no luck. By putting male hormones in their water, he made some Mollies brighter colored. But they remained Amazon, and did not attempt to be fathers...