Hasyima Ismail N, Amin Safwan A, Fairuz Fozi N, Megat F H, Muhd Farouk H, Kamaruddin S A, Ikhwanuddin M, Ambak M A
Institute of Tropical Aquaculture, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia.
Institute of Oceanography and Environment, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia.
Pak J Biol Sci. 2017;20(3):140-146. doi: 10.3923/pjbs.2017.140.146.
Orange mud crab Scylla olivacea is one of the most important fisheries resources. A new development in ageing technique of crustaceans has been introduced. The detection of growth band deposited in hard structure of gastric mill in the cardiac stomach are found retained after moulting process can be used as age indicator and growth estimation.
This study was carried out to determine the comparison between carapace width and growth band count of S. olivacea in Malaysia.
Samples were collected from Setiu Wetlands, Terengganu, Malaysia from February until August, 2016. Samples were categorized based on their morphological measurements. The mesocardiac and zygocardiac ossicles in the gastric mill of S. olivacea was dissected out and preserved in solutions and underwent a cross sectioning process. A total of 76 of wild S. olivacea ranging from 6.56 to 12.84 cm in carapace width were analysed. The growth band counts were examined for each individual and ranging from 1 to 3 band counts.
A positive linear relation was observed between CW and GBC with r2 = 0.5178, p<0.01. Overall, there was a strong, positive correlation between CW and GBC. Increase in CW were correlated with increases in GBC respectively for this species.
Therefore, the carapace width, growth band counts and body weight can be used to improve data on growth, recruitment, maturation and mortality. Thus, this study would able to improve new ageing technique and contribute greatly to improve the conservation and management of S. olivacea in Setiu Wetlands, Terengganu, Malaysia.
橄榄青蟹是最重要的渔业资源之一。甲壳类动物年龄鉴定技术有了新进展。发现在蜕皮过程后保留在贲门胃磨胃硬结构中沉积的生长带可作为年龄指标和生长估计。
本研究旨在确定马来西亚橄榄青蟹的头胸甲宽度与生长带计数之间的比较。
2016年2月至8月从马来西亚登嘉楼的Setiu湿地采集样本。样本根据其形态测量进行分类。解剖出橄榄青蟹胃磨中的中贲门和颧贲门小骨，保存在溶液中并进行切片处理。共分析了76只野生橄榄青蟹，头胸甲宽度在6.56至12.84厘米之间。检查了每只个体的生长带计数，范围为1至3条生长带。
观察到头胸甲宽度（CW）与生长带计数（GBC）之间呈正线性关系，r2 = 0.5178，p<0.01。总体而言，CW和GBC之间存在强正相关。该物种的CW增加分别与GBC增加相关。
因此，头胸甲宽度、生长带计数和体重可用于改善有关生长、补充、成熟和死亡率的数据。因此，本研究将能够改进新的年龄鉴定技术，并为改善马来西亚登嘉楼Setiu湿地橄榄青蟹的保护和管理做出巨大贡献。
