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BioMed Research International
Volume 2014, Article ID 404595, 5 pages
http://dx.doi.org/10.1155/2014/404595
Research Article

Growth Performance and Stress Responses of Larval Mississippi Paddlefish Polyodon spathula to Hypoxia under Different Diet Treatments

College of Fisheries, Huazhong Agricultural University, Shizishan Road, Hongshan District, Wuhan, Hubei 430070, China

Received 12 January 2014; Revised 7 March 2014; Accepted 24 March 2014; Published 14 April 2014

Academic Editor: Zhi-Hua Li

Copyright © 2014 Ya Zhu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A growth trial was conducted to detect the effects of different diets on the growth performance and hypoxia adaptation capacity of Mississippi Paddlefish (Polyodon spathula) larvae. The larvae were fed with live food, formulated diets, and 1/2 live food with 1/2 formulated diets. After a 15-d growth trial, final body weight and total body length were measured, and five larvae from each dietary group were subjected to 1 h of hypoxia treatment. Serum total antioxidant capacity (T-AOC), serum superoxide dismutase (SOD), and liver malondialdehyde (MDA) were measured. Final body weight and weight gain of the fish fed live food were significantly higher than the values for the other two groups. Total body length of the fish fed live food and 1/2 live food with 1/2 formulated diets exhibited no significant difference. After hypoxia treatment, serum T-AOC and SOD activities of the fish fed formulated diets were significantly lower than those of the other two groups. Liver MDA content of the fish fed with live food was significantly higher than that of the other two groups. In conclusion, larval paddlefish fed with an appropriate proportion of live food and formulated diets exhibit improved adaptive capacity to hypoxia.