Abstract
The experiment was conducted to investigate the effects of prepared hairtail protein hydrolysate–Fe2+ (PH–Fe2+) complexes on growth and non-specific immune responses of crayfish (Procambarus clarkii). The diets with five different levels of PH–Fe2+ (200, 400, 600, 800, and 1000 mg/kg) were fed to crayfish for 60 days. The results indicated that the survival rate, weight gain percentage, specific growth rate, and muscle index of crayfish with 400–1000 mg/kg of PH–Fe2+ feeding were significantly higher, 9.94–10.10, 8.55–8.72, 0.24–0.29 %/day, and 2.39–3.05 %, respectively, than the control values after 60 days of feeding. Additionally, after 30 days of feeding, 200–400 mg/kg of PH–Fe2+ showed no significant (P > 0.05) improvement effect on activities of superoxide dismutase (SOD), phenoloxidase (PO), lysozyme (LSZ), and acid phosphatase (ACP) in serum or hepatopancreas of crayfish. However, significant improvement effects were observed in 800–1000 mg/kg groups. After 60 days of feeding, 400–600 mg/kg of PH–Fe2+ significantly (P < 0.05) improved the activity of SOD and LSZ, but did not affect the activity of PO and ACP significantly (P > 0.05). Moreover, the activities of SOD, PO, LSZ, and ACP in serum and hepatopancreas were all significantly enhanced upon treatment with 800–1000 mg/kg of PH–Fe2+. For these reasons, PH–Fe2+ can be recommended as a supplement in crayfish feed to increase the growth and immunity.
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Acknowledgments
This study was funded by the National Natural Science Fund project, China (Grant No. 31201452), Natural Science Foundation of Zhejiang province (Grant No. LY14C 200002), and Science and technology project of Zhoushan (Grant Nos. 2013C11007 and 2013C41015). We thank LetPub for its linguistic assistance during the preparation of this manuscript.
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Zhang, B., Shi, Zr., Wang, Xl. et al. The effects of hairtail protein hydrolysate–Fe2+ complexes on growth and non-specific immune response of red swamp crayfish (Procambarus clarkii). Aquacult Int 24, 1039–1048 (2016). https://doi.org/10.1007/s10499-016-9969-0
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DOI: https://doi.org/10.1007/s10499-016-9969-0