Crustacean Aquaculture Research Division, Fisheries Research Institute Pulau Sayak, Kota Kuala Muda, Malaysia.
Centre of Global Sustainability Studies, Universiti Sains Malaysia, Gelugor, Malaysia.
Anim Biotechnol. 2023 Dec;34(8):4126-4134. doi: 10.1080/10495398.2023.2267621. Epub 2024 Jan 30.
Sex reversal of male to female is a characteristic of barramundi (), which is affected by several factors, thereby changing the broodstock population. A study was conducted in floating cages in Langkawi, Malaysia, to determine the weight point at the onset of the sex reversal phenomena. A total of 75 female and 55 male adult individuals (3-4 weeks of age) were sampled from the fish cultured in cages to ascertain their sex at different weights. The water temperature and salinity values were 29.82 °C and 33.12 ppt, respectively. The specimens were classified into twelve bodyweight classes (2.00-8.00 ± 0.5 kg intervals). Female specimen body weight distribution was highest in the 6.01-6.50 kg class (22.6%), followed by the 5.51-6.00 kg and 4.51-5.00 class (13.3%), while male specimen body weight distribution was highest in the 4.51-5.00 kg class (32.1%), followed by the 4.01-4.50 kg class (30.3%). Length-to-weight relationships for females and males of Asian Seabass indicated positive allometric growth. The correlation between body weight and GSI, using Pearson's correlation, for both sexes, for the male and female barramundi, there was a weak correlation between body weight and GSI, which was 37 and 30%, respectively. Based on the present study's findings, it can be concluded that sex reversal from male to female in Barramundi largely occurred at 4.57 kg body weight and 66.8 cm total length.
性反转是雄性棘臀鱼（）的特征之一，受多种因素影响，从而改变亲鱼种群。本研究在马来西亚兰卡威的浮动笼中进行，以确定性反转现象发生时的体重临界点。从笼中养殖的鱼类中总共抽取了 75 只雌性和 55 只雄性成年个体（3-4 周龄），以确定它们在不同体重时的性别。水温与盐度值分别为 29.82°C 和 33.12 ppt。将标本分为十二个体重组（2.00-8.00±0.5 kg 间隔）。雌性标本体重分布最高的是 6.01-6.50 公斤组（22.6%），其次是 5.51-6.00 公斤和 4.51-5.00 公斤组（13.3%），而雄性标本体重分布最高的是 4.51-5.00 公斤组（32.1%），其次是 4.01-4.50 公斤组（30.3%）。亚洲海鲈雌性和雄性的体长与体重关系呈正异速生长。利用 Pearson 相关系数对两性的体重与 GSI 进行相关性分析，对于雄性和雌性棘臀鱼，体重与 GSI 之间存在弱相关性，分别为 37%和 30%。基于本研究的结果，可以得出结论，棘臀鱼的雄性到雌性的性反转主要发生在体重 4.57 公斤和全长 66.8 厘米时。
