Interactive impact of temperature and salinity on physiological adaptability of Pacific whiteleg shrimp Litopenaeus vannamei ABDUL HAFIZ ISMAIL(1), MAZLAN ABD. GHAFFAR(1)(2)(3), LIEW HON JUNG(1*)
a)Higher Institution Centre of Excellence (HICOE), Institute of Tropical Aquaculture and Fisheries, Institute of Marine Biotechnology, Faculty of Environment and Marine Science, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia.
Abstract
Pacific Whiteleg shrimp farming contributed the most economical important in shrimp farming. However, with the changing environment conditions nowadays putting shrimp farming in a great challenge. It is important to understand how the shrimp remodel their physiological needs to cope with unpredictable environment changing. This study was designed to examine the interactive effect of temperature (28 vs. 34 ⁰-C) and salinity (30 vs. 20 ppt) on the physiological responses using osmorespiration assay. All juvenile shrimps were subjected to interactive conditions as T1 (28⁰-C+30ppt), T2 (28⁰-C+20ppt), T3 (34⁰-C+30ppt), and T4 (34⁰-C+20ppt) for 30 days. Results revealed that both temperature and salinity significantly affected the metabolic oxygen consumption and ammonia excretion rates. Higher osmorespiration responses was noticed in the shrimp exposed to interactive high temperature and low salinity conditions (T4), followed by high temperature and normal salinity condition (T3) and normal temperature with low salinity (T2) as compared to normal temperature and salinity condition (T1). This study indicated that changing environment conditions significantly affect the cost of living which may negatively impact the growth performance as consequence.
