Contribution of bioflocs to the culture of Litopenaeus vannamei post-larvae determined using stable isotopes

• Published in: Aquaculture international Vol. 24; no. 5; pp. 1473 - 1487
• Main Authors: Suita, Sabrina M., Braga, André, Ballester, Eduardo, Cardozo, Alessandro P., Abreu, Paulo Cesar, Wasielesky, Wilson
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01-10-2016; Springer Nature B.V
• Subjects: Alkalinity; Aquaculture; Artemia; Biomedical and Life Sciences; Chaetoceros muelleri; Chemical elements; Decapoda; Feeds; Food; Freshwater & Marine Ecology; Larvae; Life Sciences; Litopenaeus vannamei; Microorganisms; Organic carbon; Stable isotopes; Suspended solids; Zoology; Brazil; Nursery; Biofloc; Stable isotopes; Post-larvae quality; Shrimp
• ISSN: 0967-6120; 1573-143X
• DOI: 10.1007/s10499-016-0006-0

The aim of this study was to use preselected quality indicators for
Litopenaeus vannamei
post-larvae and the stable isotopes technique with δ
13
C and δ
15
N to determine the influence of bioflocs in shrimp feeding during the nursery phase, between PL1 and PL30. A control treatment (CT) with water renewal was compared to a biofloc treatment (BT) that received organic carbon fertilizations. Different types of commercial feed (Stresspak and Flake-INVE™, PL40-GUABI™), microalgae (
Chaetoceros muelleri
) and
Artemia
sp. nauplii were used as food sources. The physical and chemical parameters of water and ammonia were monitored daily, and nitrite, nitrate and alkalinity were measured weekly. Suspended solids and the microorganisms of bioflocs were characterized. At the end of the experiment, fifteen shrimps of each replicate were collected to evaluate nine larvae quality indicators. Isotopic values of
13
C and
15
N of food sources and shrimp tissues were collected on days 10, 20 and 30, and a Bayesian model of isotopic mixture measured the contributions of these sources to the shrimp biomass. Salinity, alkalinity and nitrite differed significantly between the treatments but were appropriate for post-larvae production. The larvae quality conditions in the CT treatment were ranked as “good,” whereas the BT conditions were considered “excellent” according to the analysis of larval quality parameters. The stable isotopes analysis showed that the PL40 GUABI™ feed was the most important food source throughout the experimental period in the CT. In the BT (10th and 20th days), the bioflocs and commercial feeds (Flake-INVE™, PL40-GUABI™) did not present significant variations in their contribution ratios; however, on the 30th day, the contribution of the PL40-GUABI™ feed was higher when compared to bioflocs. In general, the commercial feed played a more important role as a food source for
Litopenaeus
vannamei
larvae during the nursery phase, although the consumption of bioflocs led to a better larvae quality.