Life History Traits, Elasticity Analyses, and Phenotypic Plasticity of Squaliobarbus curriculus in the Pearl River Estuary, China

Squaliobarbus curriculus , commonly known as red-eye fish, is widely distributed in East Asia. It one of the important aquatic germplasm resource and economic species Pearl River. To give suggestions for better protection management, we investigated its life history conducted elasticity analyses. Samples ( n = 451) were collected between 2016 2017 from western River estuary. There no significant differences length-weight relationships females males W 0.00001SL 3.121 ). The von Bertalanffy growth function was L t 553.2 [1 − e −0.111(t+1.009) ]. estimated length at 50% sexual maturity 209.6 200.0 mm males, both 3 years age. Oocyte size-frequency distribution suggested batch spawning. Fecundity ranged 9,407 175,086 eggs per fish (mean 51,040, or 143.9 eggs/g weight). understand ecological phenotypic plasticity S. meta-analyses on all available data this species. Our results showed that standard lengths ages 2 estuary significantly smaller than upper reaches basin, there also obvious fecundity oocyte size. For more, correlated negatively with latitude. Elasticity analysis juveniles’ (aged 1–3) survival had largest contribution to population rate, which suggests management efforts should focus early stages.