Effects of water temperature rise on energy budget allocation in Pacific white shrimp (Litopenaeus vannamei)

Abstract

Shrimp farming is suffering from slow growth and high feed intake due to the rise of water temperature during summer. In this study, physiology and bioenergetics of juvenile Litopenaeus vannamei reared for 4 weeks at ambient (29 °C) and excessive (33 °C) temperatures were evaluated. Obtained data of feed intake (C), growth rate (P), apparent heat index (AHI), oxygen consumption (R), fecal loss (F), ammonia excretion (U), and molting (M) were converted to energy equivalents. The results indicated that growth energy for shrimp (R+AHI+F) at 33 °C was 1.8-fold higher than that of shrimp at 29°C. Most energy contents (AHI, R, F, U) reared at 33 °C was significantly higher than that of shrimp at 29°C except M and P. Shrimp reared at 33 °C have lost their weight energy by 14.15 %. This indicated that shrimp reared at excessive temperature suffered from insufficient energy for growth.

Keywords

• thermal stress
• global warming
• energy expenditure
• oxygen consumption
• growth performance