Aljahdali Mohammed Othman, Molla Mohammad Habibur Rahman
Department of Biological Sciences, Faculty of Science, King Abdulaziz University, P.O. 8 Box 80203, Jeddah 21598, Saudi Arabia.
Saudi J Biol Sci. 2022 Sep;29(9):103395. doi: 10.1016/j.sjbs.2022.103395. Epub 2022 Jul 25.
Sea Urchin is not only the crucial keystone species for the coral reef restoration but also it has antimicrobial and anti-cancer activities. This study undertaken to focus on length weight relationship, size fecundity distribution and the estimation of fecundity from the long-spined Sea Urchin, at the coastal water of the middle Red Sea, Saudi Arabia. A total of 633 specimen of has been collected from the coastal water of Obhur Creak during the sampling time. In each species, total length (TL) measured as a TW = 11.908 × 0.9995 (R = 0.8975) through the linear regression graph and digital slide callipers and, individual body weight estimated by the digital balance. The natural and fishing mortality 2.02/yr and 0.19/yr respectively has documented from study area. The Asymptotic length value (L∞) (cm) were estimated 7.35 where the growth coefficient (K) was 0.67 from the monthly length-frequency numeric data by using FAO FISAT II software for generating and estimating the population parameters and age. However, the recruitment pattern was observed to be increased gradually with the maximum recruitment peak between the months of September and October 2021. Therefore, the estimation of fecundity varied from 49,226 ova (total length 3.1 cm) to 466,133 ova (total length 6.8). As a result, analysis of the relationship between the absolute fecundity (F) and total length (TL), and between the fecundity and drained body weight (DW), revealed a linear regression model with a positive and significant relationship at p < 0.05. This is the first approach to study the detailed population dynamic of the ecologically and economically important tropical long spine sea urchin () endemic to the region. However, the result so far obtained from this research would greatly be useful towards the understanding of the detailed population structure and growth patterns that will undoubtedly help us to develop captive breeding, seed production, culture protocols, conservation strategies and isolation bioactive compounds of this high-valued species incommensurate with national and international perspectives.
海胆不仅是珊瑚礁恢复的关键基石物种，还具有抗菌和抗癌活性。本研究聚焦于沙特阿拉伯红海中部沿海水域长刺海胆的体长与体重关系、大小繁殖力分布以及繁殖力估计。在采样期间，共从奥胡尔溪的沿海水域采集了633个标本。在每个物种中，通过线性回归图和数字游标卡尺测量全长（TL），公式为TW = 11.908×0.9995（R = 0.8975），个体体重由数字天平估计。研究区域记录的自然死亡率和捕捞死亡率分别为每年2.02和每年0.19。使用粮农组织FISAT II软件根据月度体长频率数值数据估计渐近体长值（L∞）（厘米）为7.35，生长系数（K）为0.67，以生成和估计种群参数及年龄。然而，观察到补充模式逐渐增加，2021年9月至10月间出现最大补充峰值。因此，繁殖力估计值从49,226个卵（全长3.1厘米）到466,133个卵（全长6.8厘米）不等。结果表明，绝对繁殖力（F）与全长（TL）之间以及繁殖力与沥干体重（DW）之间的关系分析显示，在p < 0.05时存在正相关且显著的线性回归模型。这是首次研究该地区特有的具有生态和经济重要性的热带长刺海胆详细种群动态的方法。然而，迄今为止从这项研究中获得的结果将非常有助于理解详细的种群结构和生长模式，这无疑将帮助我们制定圈养繁殖、种苗生产、养殖方案、保护策略以及分离这种高价值物种的生物活性化合物，符合国家和国际视角。
