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ผู้เขียน หัวข้อ: Photosynthesis, water respiration and growth performance of Litopenaeus vannamei  (อ่าน 1348 ครั้ง)
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« เมื่อ: มิถุนายน 26, 2014, 09:48:12 AM »

Photosynthesis, water respiration and growth performance of Litopenaeus
vannamei in a super-intensive raceway culture with zero water exchange:
Interaction of water quality variables

Luis Vinatea a,*, Alfredo O. Ga? lvez b, Craig L. Browdy c, Al Stokes c, Jesus Venero c, Jason Haveman c,
Beth L. Lewis c, Alisha Lawson c, Andrew Shuler c, John W. Leffler c

a Universidade Federal de Santa Catarina, Depto. de Aquicultura, Laborato?rio de Camaro?es Marinhos, Floriano?polis, SC, CEP 88040-900, Brazil
b Universidade Federal Rural de Pernambuco, Depto. de Pesca e Aquicultura, Laborato?rio de Maricultura Sustenta?vel, Recife, PE, CEP 52171-900, Brazil
c South Carolina Department of Natural Resources, Waddell Mariculture Center, Bluffton, SC, SC 29910, USA


A B S T R A C T

Gross and net photosynthesis, and water column respiration of a super-intensive Litopenaeus vannamei raceway culture with zero water exchange weremeasured over 21 weeks using the light and dark bottle method. Spearman correlation analysis was used to explore the relationship of these parameters with other water quality parameters (O2, temperature, pH, alkalinity, TAN, NO2, NO3, dissolved orthophosphate, turbidity, TSS and VSS) and of shrimp performance based on growth rate and feed conversion rate. Net photosynthesis generally had negative values, indicating that the system was predominantly heterotrophic. Gross photosynthesis was significantly related only with VSS, and water column respiration was related only with turbidity. Shrimp growth rate increased with higher temperature and dropped with higher pH. Nitrite had a strong inverse relationship with shrimp growth rate (R2 = 0.8044, p < 0.001) and a weak relationship with FCR (R2 = 0.3319, p = 0.0284). VSS has a significant inverse relationship with shrimp growth rate (R2 = 0.4989, p = 0.0102) and a direct relationship with FCR (R2 = 0.5356, p = 0.0162). Photosynthesis and the water column respiration did not seem to have a significant impact on shrimp productivity.


Keywords: Water quality Photosynthesis Litopenaeus vannamei Super-intensive culture
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