Aspects of the reproductive biology in mudskipper Periophthalmus waltoni koumans, 1941 in Hormozgan province

The present study was conducted on aspects of reproductive biology of Mudskipper, Periophthalmus waltoni from Hormozgan Province. 198 specimens were catch from March 2011 to February 2012. The mean (±SD) total length and weight for 108 female specimens were 102.08±22.18 mm, 7.79±5.04 g and for 98 male specimens were 96.19±17.86 mm, 6.42±3.97 g, respectively. The overall sex ratio 0.83 male to 1 female was observed but was not significantly different from the theoretical 1:1 (P>0.05). The mean (±SD) absolute fecundity was 2965.58± 1187.62 eggs. The egg diameter was 0.66- 0.042 mm; that it’s mean was 0.453 (±0.160). The HSI index reached their peaks in March for both sexes. The mean relative fecundity was 438.22±56.05 eggs. The Gonadosomatic index (GSI(were 8.09 for female and 0.7 for male. The Gonadosomatic Index (GSI) for females reached its peaks in March while for male reached its peak in January. The mean of condition factor of male and female were 0.49 and 0.61 respectively.