This study was designated to reveal reproduction aspects of D. neapolitana that can support the domestication and cultivation of D. neapolitana. This research method is a survey method, and sampling was carried out three times at four points in the mangrove area of Jeruklegi Cilacap. The samples that have been taken are taken to the Animal Physiology Laboratory and stored in a bucket of 15 ppm brackish water and then aerated. The variables measured were the number of worm segments, worm body weight, the sex ratio of the worms, the development of male and female gametes and environmental factors. To see the relationship between parameters, correlation analysis, regression and t-test were used to determine the difference in the number of segments and body weight of male and female worms. The sex ratio value obtained was 1: 1. The body size of the female and male D. neapolitana worms was not significantly different. Observations on female worms showed the number of segments means 131.96 ± 28.19 pieces; body weight means 2.65 ± 1.15 g and egg diameter mean 219.656 ± 9.75 µm. Male worms had several segments represent 136.97 ± 24.51; body weight means 2.18 ± 1.11 g and the form of sperm was tetrad spermatid. While indetermined worms had several segments mean 115 ± 39.38 and body weight mean 2 ± 0.73 g. The results of the analysis of the relationship between body weight and maturation level of D. neapolitana obtained the value of r = 0.009, linear regression equation y = 219868 -0.080x; and the value of t count (-0.043)
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