TITLE:
Effects of Hypoxia on the Survival of Large Yellow Croaker (Larimichthys crocea) under Different Temperature and Fish Weight Conditions
AUTHORS:
Xiaolian Gu
KEYWORDS:
Larimichthys crocea, Hypoxia, Mortality, Survival Analysis
JOURNAL NAME:
Agricultural Sciences,
Vol.17 No.11,
November
13,
2026
ABSTRACT: Hypoxia zones (low dissolved oxygen, DO 50 (lethal oxygen concentration causing 50% mortality) was 1.37 mg/L at 25˚C and 1.41 mg/L at 30˚C. Cox regression survival analysis was conducted to evaluate relationships between survival rate and DO concentration, fish body size, and temperature. DO exerted a significant effect on mortality hazard: 1 unit DO increase reduced the hazard by approximately 38.3%; 1˚C rise in temperature increased the mortality hazard by 8.5%; and each 1 g increase in body weight decreased the mortality hazard by 0.1%. Our experiments demonstrated that 24-h acclimation to sublethal hypoxia significantly reduced mortality during subsequent exposure to lethal hypoxia. Our findings indicate that direct hypoxia-induced mortality varies with body size, water temperature, and pre-acclimation.