The Key Laboratory of Aquaculture Nutrition and Feed of Ministry of Agriculture

The Key Laboratory of Aquaculture Nutrition and Feed of Ministry of Agriculture

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Lei Y.,The Key Laboratory of Aquaculture Nutrition and Feed of Ministry of Agriculture | Zhang W.,The Key Laboratory of Aquaculture Nutrition and Feed of Ministry of Agriculture | Xu W.,The Key Laboratory of Aquaculture Nutrition and Feed of Ministry of Agriculture | Zhang Y.,The Key Laboratory of Aquaculture Nutrition and Feed of Ministry of Agriculture | And 2 more authors.
Journal of Ocean University of China | Year: 2015

The aim of this study was to compare the effects of waterborne copper (Cu) and cadmium (Cd) on survival, anti-oxidative response, lipid peroxidation and metal accumulation in abalone Haliotis discus hannai. Experimental animals (initial weight: 7.49 g ± 0.01 g) were exposed to graded concentrations of waterborne Cu (0.02, 0.04, 0.06, 0.08 mg L−1) or Cd (0.025, 0.05, 0.25, 0.5 mg L−1) for 28 days, respectively. Activities of the anti-oxidative enzymes (catalase, CAT; superoxide dismutase, SOD; glutathione peroxidases, GPx; glutathione S-transferase, GST), contents of the reduced glutathione (GSH) and malondiadehyde (MDA) in the hepatopancreas, and metal accumulation in hepatopancreas and muscles were analyzed after 0, 1, 3, 6, 10, 15, 21, 28 days of metal exposure, respectively. Results showed that 0.04 mg L−1, 0.06 mg L-−1 and 0.08 mg L−1 Cu caused 100% death of abalone on the 21st, 10th and 6th day, respectively. However, no dead abalone was found during the 28-day waterborne Cd exposure at all experimental concentrations. Generally, activities of SOD and GST in hepatopancreas under all Cu concentrations followed a decrease trend as the exposure time prolonged. However, these activities were firstly increased and then decreased to the control level and increased again during Cd exposure. Activities of CAT in all Cu exposure treatments were higher than those in the control. These activities were firstly increased and then decreased to the control level and increased again during Cd exposure. Contents of MDA in hepatopancreas in all Cu treatments significantly increased first and then decreased to the control level. However, the MDA contents in hepatopancreas were not significantly changed during the 28-day Cd exposure. The metals accumulation in both hepatopancreas and muscles of abalone significantly increased with the increase of waterborne metals concentration and exposure time. These results indicated that H. discus hannai has a positive anti-oxidative defense against Cu or Cd. In conclusion, anti-oxidative mechanism in abalone to resist waterborne Cu did not follow the same pattern as that for waterborne Cd. © 2015, Science Press, Ocean University of China and Springer-Verlag Berlin Heidelberg.


Li M.,The Key Laboratory of Aquaculture Nutrition and Feed of Ministry of Agriculture | Mai K.,The Key Laboratory of Aquaculture Nutrition and Feed of Ministry of Agriculture | Ai Q.,The Key Laboratory of Aquaculture Nutrition and Feed of Ministry of Agriculture | He G.,The Key Laboratory of Aquaculture Nutrition and Feed of Ministry of Agriculture | And 5 more authors.
Journal of Ocean University of China | Year: 2015

This study investigated the effect of dietary lipid on the growth, fatty acid composition and Δ5 fatty acyl desaturase genes (Fads) expression of juvenile abalone (Haliotis discus hannai Ino) hepatopancreas. Six purified diets were formulated to contain tripalmitin (TP), olive oil (OO, 72.87% 18:1n-9), grape seed oil (GO, 68.67% 18:2n-6), linseed oil (LO, 70.48% 18:3n-3), ARA oil (AO, 41.81% ARA) or EPA oil (EO, 44.09% EPA and 23.67% DAH). No significant difference in survival rate was observed among abalone fed with different diets. Weight gain rate (WGR) and daily growth rate of shell length (DGRSL) were significantly increased in abalone fed with diets containing OO, AO and EO, but decreased in abalone fed with LO diet (P < 0.05) in comparison with those fed with TP. High level of dietary 18:2n-6 resulted in higher content of n-6 polyunsaturated fatty acids (PUFAs) in abalone fed with GO than those fed with TP, OO, LO and EO (P < 0.05). n-3 PUFAs in abalone fed with LO was significantly higher than those in abalone fed with TP, OO, GO and AO (P < 0.05). The highest contents of 20:1n-9 and 22:1n-9 were observed in abalone fed with OO. The expression of Δ5 Fads in hepatopancreas of abalone was enhanced by high concentration of 18:3n-3 and suppressed by dietary LC-PUFAs; however it was not affected by dietary high concentration of 18:1n-9 or 18:2n-6. These results provided valuable information for understanding the synthesis of LC-PUFAs and nutritional regulation of Δ5 Fads expression in abalone. © 2015, Science Press, Ocean University of China and Springer-Verlag Berlin Heidelberg.

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