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June 2, 2013

Brazil

Zero-Exchange Penaeus vannamei Nurseries with Benthic Diatoms

 

From Abstract: The aim of this experiment was to evaluate marine shrimp (Penaeus vannamei) nursery growth with addition of benthic diatoms (Navicula species).  The 20-day experiment was carried out in May/June 2012.  Four treatments were used: biofloc treatment (BFT), biofloc treatment with additional feed (BFTF), biofloc treatment with additional benthic diatoms (BFTD, Navicula), and clear water with additional feed and benthic diatoms (CWFD, Navicula), each with three replications.

 

The shrimp (1.77 mg) were stocked to density of 2,500 shrimp/m3 and microalgae was added every five days until a density of 50,000 cells/mL was reached.  The shrimp were fed with a 42% crude protein commercial feed three times a day.  Bioflocs were established 30 days before the start of the experiment.  Water was aerated, and molasses (40% carbon) and a commercial shrimp diet (350 g Kg-1 CP) were added to promote biofloc development.  After biofloc formation, molasses was added once a day in treatments BFT, BFTF and BFTD when total ammonia nitrogen was about 0.8 mg/L.  Primary productivity (gross and net photosynthetic activity and respiration) was analyzed by measuring the dissolved oxygen in light and dark bottles.  For data analysis Bartlett, Shapiro-Wilk, ANOVA and Tukey tests (p <0.05) were used.

 

Significant differences between treatments were observed for final weight, weight gain, final biomass, biomass gain, specific growth rate (SGR) and survival. The CWFD treatment showed the best results, emphasizing the importance of the diatoms (Navicula).

 

 

Source: The Thumb Drive Containing the Abstracts from Aquaculture 2013 (February 21-25, 2013, Nashville, Tennessee, USA).  Information: John Cooksey, World Aquaculture Conference Management, P.O. Box 2302, Valley Center, California 92082, USA (phone 1-760-751-5005, fax 1-760-751-5003, email worldaqua@aol.com).  Growth of Litopenaeus Vannamei Nursery With Zero Water Exchange Systems and With Addition of Benthic Diatoms.  Alfredo O. Gálvez (email alfredo_oliv@yahoo.com, Universidade Federal Rural de Pernambuco–UFRPE, Fisheries and Aquaculture Department Dois Irmãos, 52171-900, Recife, Pernambuco, Brazil), Clarissa V.F. da Silva, Ítala G.S. dos Santos, Rayzza H.M. Sena, Cecília F.F. Craveiro, Rebeca F.L. Vasconcelos and Luis Otavio Brito.  February 2013.

 

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