Influência da Suplementação de Óleo de Krill no Desempenho Zootécnico de Juvenis do Camarão Litopenaeus Vannamei Cultivado em Tanques Estufados e Abertos.

Abstract

Marine oils are sources of energy and nutrients essential for shrimp, containing phospholipids, cholesterol and highly unsaturated omega 3 fatty acids. Krill oil is obtained from the processing of Antarctic krill, Euphausia superba. The product contains a minimum of 750 mg / kg of natural astaxanthin, known to enhance the color of shrimp caudal tissue and increase immune resistance due to its antioxidant function. The present work aimed to analyze the effect of supplementation of astaxanthin rich krill oil (QRILL ™ Astaxanthin Oil, Aker Biomarine Antarctic AS, Lysaker, Norway) on a commercial ration for L. vannamei juveniles in different cultivation systems (stewed and open). ). Shrimps were cultivated in 54 open 1 m3 tanks. The stowed tanks were capped and covered with a milky waterproof plastic tarpaulin to increase the temperature. The open tanks were kept exposed to sunlight, covered only with an 8 mm mesh, to prevent shrimp from escaping. A total of 7,182 animals with an average body weight of 1.08 ± 0.11 g were stocked at a density of 135 shrimps / m2. The commercial shrimp diet was supplemented with 3% oil in the combinations of 0 3, 1 2, 2 1 and 3 0% of krill (K) and soybean (S) oil, respectively. The oils were mixed and spread by hand under commercial feed. The control diet (CTL) consisted of commercial diet without additional oil supplementation. Five to six cultivation tanks were assigned to each dietary treatment. Shrimps were fed four times a day through an automatic feeder. In the open and stew system, feeding shrimp with a diet supplemented with 1 and 2% krill oil resulted in a significant increase in weekly growth, final body weight and productivity, respectively. Supplementation of 3% oil, either soybean or krill or a combination of both, significantly improved feed efficiency. The results indicated that supplementation of 1 or 2% of astaxanthin rich krill oil promoted the best zootechnical performance of L. vannamei juveniles.