Laboratory of Aquatic Resource Management, Department of Fisheries, Faculty of Agriculture, Gadjah Mada University, Jalan Flora Gedung A4, Bulaksumur, Yogyakarta, 55281, Indonesia.
Department of Aquatic Resources Management, Faculty of Fisheries and Marine Sciences, Bogor Agricultural University, Jl. Agatis Kampus IPB Darmaga, Bogor, 16680, Indonesia.
Sci Rep. 2020 Nov 16;10(1):19830. doi: 10.1038/s41598-020-76825-5.
The striped snakehead (Channa striata Bloch, 1793) is a commercially important fish in Lake Rawa Pening, central Java, Indonesia. This study aims were to investigate their age, growth, and recruitment pattern, through a sampling that was performed monthly, from November 2017 to August 2018. The individual fish was measured for length and weight, and sex was determined. The otoliths were collected, cleaned, and placed on molds to pour epoxy resin. The otoliths were cut to obtain slices and observed under a microscope at 100 × magnification. Subsequently, the age was determined by counting the number of daily rings. It was established that the snakehead spawned every month, with a comparably higher frequency in the new moon than in other phases, and mostly were 3-10 months old, characterized by bigger and older sizes during the rainy season. Furthermore, the average growth rate was observed to be faster during the rainy season in contrast with the dry season. Hence, the parameters of von Bertalanffy growth functions were estimated by back-calculated length, and the pattern in female was Lt = 56.09 (1 - e), while male Lt = 59.36 (1 - e), and total Lt = 60.32 (1 - e), respectively.
条纹𬶐（Channa striata Bloch, 1793）是印度尼西亚中爪哇拉哇佩宁湖具有商业价值的鱼类。本研究旨在通过 2017 年 11 月至 2018 年 8 月每月进行的一次采样，调查其年龄、生长和补充模式。对个体鱼进行了长度和体重测量，并确定了性别。收集了耳石，进行了清洗，并放置在模具中浇注环氧树脂。对耳石进行切割以获得切片，并在 100×放大倍数下在显微镜下观察。随后，通过计算日轮数来确定年龄。研究表明，𬶐鱼每月产卵，新月时产卵频率较高，而其他阶段则较低，大多数鱼 3-10 个月大，在雨季时体型更大、更成熟。此外，与旱季相比，雨季的平均生长速度较快。因此，通过回溯长度估计了 von Bertalanffy 生长函数的参数，雌性的 Lt=56.09(1-e)，雄性的 Lt=59.36(1-e)，总 Lt=60.32(1-e)。
