The gonadsomatic index (GSI) of mottled skate was the highest in April, GSI and HSI showed a reverse phase for its reproductive cycle. The fish had one pair of egg capsules, having 1 to 7 fertilized eggs, and spawned all the year round. When surveying the reproductive characteristics of females over 63 ㎝ in disc width, we found the spawning peak was between April to June, and the appearance ratio of egg capsules was the highest in May (32.1%). The eggs were hatched at 8℃, 13℃, 18℃, water temperature (12.8 to 24.2℃), and the best hatching temperature was 18℃. The number of fish hatched was 4 to 5 fish/egg capsules, and the hatching rate was 100%. The sex ratios of hatching larvae were 45.5% female and 54.5% male. Therefore this study will provide fundamental data and information for artificial reproduction of the mottled skate.

• Hyun-Su Jo(West Sea Fisheries Research Institute) Corresponding Author
• Gyeong-Suk Jeong(West Sea Fisheries Research Institute)
• Duk-Yong Kang(West Sea Fisheries Research Institute)
• Yeong-Rok Jo(West Sea Fisheries Research Institute)
• Hee-Woong Kang(West Sea Fisheries Research Institute)