Amin-Safwan A, Muhd-Farouk H, Nadirah M, Ikhwanuddin M
Institute of Tropical Aquaculture, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia.
School of Fisheries and Aquaculture Science, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia.
Pak J Biol Sci. 2016;19(5):219-226. doi: 10.3923/pjbs.2016.219.226.
Mud crab from the genus Scylla are considered as one of the most demanded seafood items nowadays as their flesh has high quality, tasty and higher growth rate thus support and boosted expansion in aquaculture sector especially in Malaysia. Present study was designed to focus on the effect of water salinity on the ovarian maturation of orange mud crab, Scylla olivacea based on morphological characteristics.
Samples were collected from Setiu wetlands, Terengganu, Malaysia from July-September, 2015. Ovarian maturation of S. olivacea was classified into four stages based on previous study which were: Immature (Stage 1), early mature (Stage 2), late mature (Stage 3) and fully mature (Stage 4).
Morphologically as the ovary develop the colouration start to change from translucent or whitish in colour and sometimes creamy to pale yellow, follow by light orange and lastly reddish orange. Stage 1 ovary was translucent and whitish in colour, stage 2 ovary was pale yellow in colour, stage 3 was light orange and stage 4 ovary was reddish orange in colour. Gonad Somatic Index (GSI) of S. olivacea remained low at stage 1 and 2 and began to increase started at stage 3. This present study involved three different salinities treatments, which treatment 1 (10 ppt), treatment 2 (20 ppt) and treatment 3 (30 ppt). Treatment 2 produce the highest number of stage 4 ovarian maturation based on colouration and the highest GSI recorded, follow by treatment 1 and lastly treatment 3.
This present study proved that salinity does affected the ovarian maturation of S. olivacea in captivity and provides important information regarding the effect of water salinity on ovarian maturation for further studies on reproductive biology of this species.
锯缘青蟹属的青蟹因其肉质优质、味道鲜美且生长速度较快，被视为当今最受欢迎的海鲜之一，这尤其推动了马来西亚水产养殖业的发展与扩张。本研究旨在基于形态特征，聚焦盐度对榄绿青蟹卵巢成熟的影响。
2015年7月至9月从马来西亚登嘉楼州的仕林湿地采集样本。根据先前的研究，将榄绿青蟹的卵巢成熟分为四个阶段，即：未成熟（第1阶段）、早熟（第2阶段）、晚熟（第3阶段）和完全成熟（第4阶段）。
从形态学上看，随着卵巢发育，其颜色开始从半透明或白色，有时呈乳黄色变为浅黄色，接着是浅橙色，最后是红橙色。第1阶段的卵巢呈半透明白色，第2阶段的卵巢为浅黄色，第3阶段为浅橙色，第4阶段的卵巢为红橙色。榄绿青蟹的性腺体指数（GSI）在第1和第2阶段保持较低水平，从第3阶段开始上升。本研究涉及三种不同的盐度处理，处理1（10 ppt）、处理2（20 ppt）和处理3（30 ppt）。基于颜色和记录的最高GSI，处理2产生的第4阶段卵巢成熟数量最多，其次是处理1，最后是处理3。
本研究证明盐度确实会影响圈养榄绿青蟹的卵巢成熟，并为进一步研究该物种的生殖生物学提供了关于水盐度对卵巢成熟影响的重要信息。
