Abstract
The development was studied at constant temperatures with intervals less 'than 0.5 C on more than 1000 fertilized eggs from stocks of Etheostoma lepidum obtained from the Llano River at Junction, Texas. Hatching occurred between 3 (27 C) and 25 (12 C) days. Developmental rate seems to be made up of a series of straight lines, each controlled by its own enzyme system. The points of inflection for each developmental curve are similar or identical. Agitation decreases hatching time at cold temperatures but has less effect at warm temperatures. It seems likely that hatching can be delayed at cool temperatures to obtain maximal dispersion; however, at warm temperatures it seems more beneficial to hatch early so that the larvae can move to a cooler temperature.
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