abstractThe biofloc technology was

abstract
The biofloc technology was proposed as a sustainable solution to culture shrimp with low protein feeds even in intensive systems, which can effectively control water quality under negligible water exchange and sustain healthy culture of shrimp. This study was conducted to evaluate the effects of four dietary protein levels (20%, 25%, 30% and 35%) on selected parameters of immune and antioxidant systems, and growth performance of Litopenaeus vannamei juveniles reared in zero-water exchange biofloc-based intensive culture tanks for a period of 7 weeks. Good water quality was maintained with the promotion and development of biofloc through sucrose addition during the feeding experiment. At the end of the experiment, the total hemocyte count in the hemo- lymph, phagocytic activity of the hemocyte, and antibacterial activity and bacteriolytic activity in the plasma of shrimp showed no significant differences (P N 0.05) among the four treatments with four dietary protein levels. The shrimp in the treatment with 20% dietary protein level had the lowest total antioxidant capacity (T-AOC) in both the plasma and the hepatopancreas, and the lowest reduced glutathione/oxidized glutathione (GSH/GSSG) ratio in the plasma. No significant differences were found in the antioxidant status (in terms of T-AOC, superoxide dismutase activity, GSH level and GSH/GSSG ratio in the plasma and the hepatopancreas) of shrimp fed with 25%, 30% and 35% dietary protein levels. Furthermore, except for the suboptimal growth performance of shrimp in the treatment with 20% dietary protein level, the growth (in terms of final weight, weight gain and specific growth rate) and feed conversion rate (FCR) of shrimp in treatments with 25%, 30% and 35% dietary protein levels showed no significant differences (P N 0.05). Mean survival rates were above 85%, with no significant differences (P N 0.05) among the four treatments with four dietary protein levels. The results of this study demonstrated that, when juveniles of L. vannamei were reared in zero-water exchange biofloc-based intensive culture tanks, dietary protein level can be reduced from 35% to 25% without affecting survival, growth, FCR, and physiological status of immune response and antioxidant capability, indicating that the promoted biofloc could contribute to the protein nutrition and physiological health of cultured shrimp.

ผลลัพธ์ (ไทย) 1:

บทคัดย่อThe biofloc technology was proposed as a sustainable solution to culture shrimp with low protein feeds even in intensive systems, which can effectively control water quality under negligible water exchange and sustain healthy culture of shrimp. This study was conducted to evaluate the effects of four dietary protein levels (20%, 25%, 30% and 35%) on selected parameters of immune and antioxidant systems, and growth performance of Litopenaeus vannamei juveniles reared in zero-water exchange biofloc-based intensive culture tanks for a period of 7 weeks. Good water quality was maintained with the promotion and development of biofloc through sucrose addition during the feeding experiment. At the end of the experiment, the total hemocyte count in the hemo- lymph, phagocytic activity of the hemocyte, and antibacterial activity and bacteriolytic activity in the plasma of shrimp showed no significant differences (P N 0.05) among the four treatments with four dietary protein levels. The shrimp in the treatment with 20% dietary protein level had the lowest total antioxidant capacity (T-AOC) in both the plasma and the hepatopancreas, and the lowest reduced glutathione/oxidized glutathione (GSH/GSSG) ratio in the plasma. No significant differences were found in the antioxidant status (in terms of T-AOC, superoxide dismutase activity, GSH level and GSH/GSSG ratio in the plasma and the hepatopancreas) of shrimp fed with 25%, 30% and 35% dietary protein levels. Furthermore, except for the suboptimal growth performance of shrimp in the treatment with 20% dietary protein level, the growth (in terms of final weight, weight gain and specific growth rate) and feed conversion rate (FCR) of shrimp in treatments with 25%, 30% and 35% dietary protein levels showed no significant differences (P N 0.05). Mean survival rates were above 85%, with no significant differences (P N 0.05) among the four treatments with four dietary protein levels. The results of this study demonstrated that, when juveniles of L. vannamei were reared in zero-water exchange biofloc-based intensive culture tanks, dietary protein level can be reduced from 35% to 25% without affecting survival, growth, FCR, and physiological status of immune response and antioxidant capability, indicating that the promoted biofloc could contribute to the protein nutrition and physiological health of cultured shrimp.

ผลลัพธ์ (ไทย) 3:

นามธรรม
biofloc เทคโนโลยีถูกเสนอเป็นโซลูชั่นที่ยั่งยืนเพื่อการเพาะเลี้ยงกุ้ง มีโปรตีนต่ำอาหารในระบบเข้มข้นที่มีประสิทธิภาพสามารถควบคุมน้ำคุณภาพภายใต้ตราน้ำ เล็กน้อย และรักษาวัฒนธรรมสุขภาพของกุ้ง การศึกษานี้มีวัตถุประสงค์เพื่อศึกษาผลของระดับโปรตีน ( 20% , 25% ,30 % และ 35 % ) ในพารามิเตอร์ที่เลือกของระบบภูมิคุ้มกัน และต้านอนุมูลอิสระ และการเจริญเติบโตของหอยที่เลี้ยงใน biofloc vannamei งน้ำตราฐานศูนย์ถังเลี้ยงอย่างเข้มข้นเป็นเวลา 7 สัปดาห์ คุณภาพน้ำที่ดี คือ การรักษาด้วยการส่งเสริมและพัฒนา biofloc ผ่านนอกจากน้ำตาลซูโครสในอาหารทดลอง เมื่อสิ้นสุดการทดลองนับ hemocyte รวมในเลือด - น้ำเหลือง กิจกรรมของ hemocyte สิ่งแปลกปลอมและเชื้อแบคทีเรีย กิจกรรม และกิจกรรม bacteriolytic ในพลาสมาของกุ้งพบว่าไม่มีความแตกต่างทางสถิติ ( P N 0.05 ) ระหว่างกลุ่มการรักษาด้วยสี่ระดับของโปรตีนในอาหาร .