Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 539591
Title Influence of stocking density on growth, digestive enzyme activities, immune responses, antioxidant of Oreochromis niloticus fingerlings in biofloc systems
Author(s) Liu, Gang; Ye, Zhangying; Liu, Dezhao; Zhao, Jian; Sivaramasamy, Elayaraja; Deng, Yale; Zhu, Songming
Source Fish and Shellfish Immunology 81 (2018). - ISSN 1050-4648 - p. 416 - 422.
DOI https://doi.org/10.1016/j.fsi.2018.07.047
Department(s) Aquaculture and Fisheries
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Antioxidant - Biofloc - Digestive enzyme activities - Immune responses - Stocking density - Tilapia
Abstract

A 120-day feeding trial was conducted to evaluate the effect of different stocking densities on growth, the non-specific immunities, antioxidant status and digestive enzyme activities of Oreochromis niloticus fingerlings under a zero-water exchange biofloc system. Tilapias (0.51 ± 0.05 g) were randomly distributed in twelve tanks, each with 300 L water. The experimental design was completely randomized using three replications with four treatments 166 orgs m−3 (LD, low density), 333 orgs m−3 (MD, middle density) and 600 orgs m−3 (HD, high density) with glucose added as biofloc groups, and a clear water group without glucose added as a control 333 orgs m−3. The fish cultured in LD and MD group showed higher final body weight. For the digestive enzymes, the lipase, trypsin, and amylase activities were all depressed in HD group and control group. Regarding the immune and antioxidant abilities, significantly lower values (P < 0.05) of the lysozyme, complement 3, and glutathione were observed for the fish that reared in the control group and HD group. The stress indicator, the cortisol, 5-hydroxytryptamine, and glucose concentrations were also depressed in HD group and control group, meanwhile the alanine aminotransferase, aspartate transaminase and alkaline phosphatase were all higher in HD group and control group. The significant higher survival was observed in the LD and MD group after Vibrio harveyi challenge test. The results of the experiment indicated that the biofloc in situ had the effects of anti-crowding stress.

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