Salinity intrusion in freshwater ecosystems of low-lying coastal areas poses a major threat to aquaculture and agricultural production. An experiment was conducted to observe the effects of salinity on early life development of the freshwater aquaculture species pabda, Ompok pabda. Fish embryos (n = 200) and fry (n = 100) were exposed to five different salinity concentrations viz., 0 (control), 2.5, 5.0, 7.5 and 10.0 ppt with three replications. The LC₅₀ values were calculated by probit analysis. The 24 h LC₅₀ values recorded for embryos was 15.07 ppt and hatching success decreased significantly as salinity concentration increased. The 48 h LC₅₀ values recorded for larvae was 5.07 ppt and larval developmental rate was reduced in response to an increase in salinity concentration. Mostly larval deformities were found from 5.0 to 10.0 ppt salinity. The 72 h LC₅₀ values of fry was denoted as 2.42 ppt and fry mortality was augmented significantly with exposure time and salinity concentration. Fry mostly survived at 0 (92.67 %) and 2.5 ppt (65.67 %) salinities after 24 h exposure, but none survived at 5.0 and 7.5 ppt salinities after 48 h. 100 % fry mortalities occurred at 10 ppt salinity after 24 h exposure. Thus, the present findings provide useful information on salinity effects on early life development of Ompok pabda and sensitivity for embryonic development. It is expected that current findings will be helpful to raise awareness of the sensitivity of salinity for freshwater aquaculture species.

低洼沿海地区的淡水生态系统中的盐分入侵对水产养殖和农业生产构成了重大威胁。进行了一项实验，以观察盐度对淡水水产养殖物种帕布达（Ompok pabda）早期生命发展的影响。将鱼胚（n = 200）和鱼苗（n = 100）暴露于五种不同盐度浓度下，分别为0（对照），2.5、5.0、7.5和10.0 ppt，重复三次。LC ₅₀值通过概率分析进行计算。记录的24 h LC ₅₀值为15.07 ppt，随着盐浓度的增加，孵化成功率显着下降。48小时LC ₅₀幼虫的记录值是5.07 ppt，并且随着盐度浓度的增加，幼虫发育率降低。发现幼虫畸形的盐度为5.0至10.0 ppt。炸鱼的72 h LC ₅₀值表示为2.42 ppt，并且炸鱼死亡率随着暴露时间和盐度浓度的增加而显着增加。在暴露24小时后，鱼苗大多在0（92.67％）和2.5 ppt（65.67％）的盐度下存活，但在48 h后没有在5.0和7.5 ppt盐度下存活。暴露24小时后，在10 ppt盐度下发生100％的鱼苗死亡率。因此，本研究结果提供了盐度对Ompok pabda早期生命发育的影响的有用信息。和对胚胎发育的敏感性。预计目前的发现将有助于提高人们对盐度对淡水水产养殖物种敏感性的认识。