The process of counting fish seed is still done manually by scooped the baby fish using a simple steam shovel (similar scoop). The manual counting requires a lot of power and frequently encountered problems or obstacles such as time in counting and the inaccuracy of the calculation result. To resolve this problem required a fast and precise calculation method. Thus, the method of calculating fingerlings were designed using the keys number (keypad). The counting of baby fish, compare the input the keys number (keypad) and photodiode sensors. Output will be displayed to the seven segment viewer. If the seven segment show the same number, then the DC motor will work to close the tap line and the sensor stops working. Based on test results, the number of fish that measured 30, 50 and 100 individu. Test result "Z" uses the value of error of 5%, then these tools can be accepted as a means of calculating fish seeds with 95% confidence level. The factors that affect the overall ability of the tool is fish population, fish uniformity, the sensors construction, the volume and water conditions. Keywords : keypad, baby fish, the “Z” of test
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