Physiological plasticity of mud crab, Scylla sp. under thermal and low pH stresst
Tan Jin Mei (a*),Mazlan And. Ghaffar (a,b,c), Liew Hon Jung (a,b,c,d)

a) Higher Institution Centre of Excellence (HICOE), Institute of Tropical Aquaculture and Fisheries, Universiti Malaysia Terengganu, Kuala Nerus, Terengganu, Malaysia
*kellytan1504[at]gmail.com
b)Faculty of Science And Marine Environment, Universiti Malaysia Terengganu, Kuala Nerus, Terengganu, Malaysia
c)3Institute of Marine Biotechnology, Universiti Malaysia Terengganu, Kuala Nerus, Terengganu, Malaysia
d)Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Science, Harbin, China

Abstract

Climate change derived from ocean warming (OW) and acidification (OA) is known to negatively impact the physiological responses of marine crustacean. However, the impact to intertidal mud crab, Scylla spp. is yet fully understood. Therefore, the objective of this study was planned to determine the interactive impact of temperature and low pH on osmorespiration performance and energy mobilisation pattern of mud crab. Following exposure to temperature (28&#8451- and 34&#8451-) and pH (ambient: pH 8 and acidic: pH 6.5) for 30 days, all specimens were subjected to osmorespiration assay for oxygen consumption and ammonia excretion rate measurement. Haemolymph of crab was collected for glucose, osmolality and total haemocyte count (THC). Muscle, gonad and hepatopancreas were collected for total energy measurement. The metabolic oxygen consumption and ammonia excretion rates were found to increased concomitantly with temperature, Q10= 2.078 and 1.274 respectively. Higher hepatosomatic index (HSI) was noticed when crabs exposed to high temperature, but, in contrast with lower gonadosomatic index (GSI). Heamolymph osmolality was increased in all high temperatures and low pH condition with low glucose and THC levels. Lipids contain in muscle, hepatopancreas and gonad was decreased significantly in both acidic and high temperature conditions indicated high energy expenditure. With all the results remarked that temperature has greater impact on metabolism and energy mobilisation compared to acidic conditions.

Keywords: Climate change, environment, mud crab, metabolic response, pH, physiology, temperature

Topic: Sustainable Aquaculture and Fisheries

Plain Format | Corresponding Author (TAN JIN MEI TAN JIN MEI)

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