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January 12, 2014

Korea and Brazil

Bioflocs, PLs and Immunity—Two Studies


Korea—From Abstract: Biofloc systems contain bacteria whose cells walls consist of lipopolysaccharides, peptidoglycans and β-1, 3-glucans, all of which are known to stimulating nonspecific immune activity in shrimp.  A fourteen-day culture trial was conducted with postlarval Penaeus vannamei in the presence and absence of bioflocs.  The results suggest that bioflocs have a positive effect on growth and the expression of immune-related genes.


Source: Aquaculture Research.  Effect of Bioflocs on Growth and Immune Activity of Pacific White Shrimp, Litopenaeus Vannamei Postlarvae.  Su-Kyoung Kim, Zhenguo Pang, Hyung-Chel Seo, Yeong-Rok Cho1, Tzachi Samocha and In-Kwon Jang (email, National Fisheries Research and Development Institute, #707 Eulwang-dong, Jung-gu, Incheon 400–420, Republic of Korea).  Volume 45, Issue 2, Page 362.  January 2014.


Brazil—From Abstract: This study evaluated the use of molasses as a carbon source during the nursery rearing of Penaeus brasiliensis in a biofloc system.  During the 30-day trial, tanks were randomly assigned to molasses or no molasses treatments.  For the immunological analysis, shrimp haemolymph was collected to determine the total haemocyte count and the total protein concentration.  The immunological results were not different in the two treatments, but Vibrios were lower in the molasses treatment.  The performance results of shrimp reared with molasses addition showed that the survival rate (88.87 ± 6.36), the mean final weight (1.22 ± 0.38) and the specific growth rate (0.0309 ± 1.06) were significantly higher compared to controls (80.5 ± 2.42, 1.03 ± 0.13, 0.0256 ± 0.97, respectively).  Moreover, the addition of molasses contributed to the maintenance of water quality and lower concentration of Vibrios.  The control treatment had unstable Vibrio levels that reaching 80 × 102 colony forming units (CFUs) per milliliter, while the highest result for the molasses treatment was 20 × 102 CFU/ml, confirming the beneficial effects of molasses addition.


Source: Aquaculture Research.  Use of Molasses as a Carbon Source During the Nursery Rearing of Farfantepenaeus Brasiliensis (Latreille, 1817) in a Biofloc Technology System.  Diego Moreira de Souza (email, Laboratório de Maricultura, Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), C.P. 474, Rio Grande (RS), 96201-900, Brazil), Sabrina Medeiros Suita, Luis Alberto Romano, Wilson Wasielesky, Jr., and Eduardo Luis Cupertino Ballester.  Volume 45, Issue 2, Page 270.  January 2014.

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