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ผู้เขียน หัวข้อ: Effects of constructed microbial mats on water quality and performance of Litope  (อ่าน 11858 ครั้ง)
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« เมื่อ: กรกฎาคม 07, 2014, 11:06:38 AM »

Effects of constructed microbial mats on water quality and performance of Litopenaeus vannamei post-larvae

Carlos Lezama-Cervantes, J. Paniagua-Michel *
Department of Marine Biotechnology, Centro de Investigacio?n Cient??fica y de Educacio?n Superior de Ensenada, Km 107 Carretera Tijuana-Ensenada, 22860 Ensenada,
Baja California, Mexico


A B S T R A C T


In this study, microbial mats were designed and constructed using microbial isolates obtained from semi-intensive shrimp culture ponds. Three microbialmats (MA, MB, and MC) were constructed on lowdensity polyester according to their capacity to remove inorganic nitrogen. Shrimp were stocked at three densities using twelve-day-old post-larval Litopenaeus vannamei (PL12). The mat cultures exhibited higher oxidation of ammonia to nitrite and nitrate nitrogen when compared with controls at higher stocking densities without water exchange. The lowest ammonia concentration was observed at the end of the experiment, 1.55 mg/l, found in mat C. However, mat C also registered the highest NO3 level, at 5.98 mg/l; in contrast, MB registered 1.50 mg/l of NO2-N and the lowest nitrate conversion (2.64 mg/l NO3-N). Control cultures (without mats) exhibited an increased accumulation of ammonia and no significant increases were observed in nitrite or nitrate. Growth and survival was enhanced with mat B co-cultured with 1000 PL m2, which registered an average of 85.2% survival, and a yield of 423.5 g m2. These values were significantly higher (P < 0.05) than control units. Moreover, the microbial biomass in mat composite,PMA + MB + MCevidenced active grazing and uptake ofmat components by the shrimp. These findings can be used to recycle the excess N from shrimp production in a continuous and selfsufficient growth of indigenous microorganisms in the polyester support, thus providing additional food and water suitable to reuse for intensive shrimp larval rearing at low cost, particularly in closed culture systems with minimal or not water exchange

Keywords: Microbial mats  Polyester substrates  Shrimp culture
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