Influence of dietary protein levels on growth, digestibility, digestive enzyme activity and stress tolerance in white-leg shrimp, Litopenaeus vannamei (Boone, 1931), reared in high-density tank trials

Abstract

The e¡ects of dietary protein (DP) levels on the growth, digestibility, digestive enzyme activity and stress tolerance of Litopenaeus vannamei (Boone, 1931) were investigated in high-density (375 m^3) tank trials. Shrimps (6.2 AE 0.2 g) were fed diets with ¢ve di¡erent protein levels (31%, 35%, 39%, 43% and 47%) for 60 days. The results showed that variations in DP signi¢cantly (Po0.05) in£uenced the growth performance, digestibility, enzyme activity and their ability to tolerate stress.Weight gain showed a linear increase in relation to crude protein (CP) up to 43% and showed a slight decrease with a further increase to 47%. Feed conversion ratio was observed to be the lowest in CP 43%: 2.53. A higher protein e⁄ciency ratio was observed with the low-protein diet CP31 (1.07); however, it was not signi¢cantly di¡erent from the rest of the dietary treatments. Protein digestibility was the highest (75.71%) in CP47 and the lowest (71.94%) in CP31. Protease activity ranged between 63.7 and 70.2 (U Protein^1), and showed a positive correlation with the DP levels. Shrimp fed CP43 well tolerated a sudden decline in salinity and survived for 548.3 min in fresh water. Observations from this study indicate that a DP level around 43% could be optimum for L. vannamei in high-density culture systems in the absence of natural productivity.

Effects of bioflocs on dietary protein requirement in juvenile whiteleg Shrimp,Litopenaeus vannamei

“…Dietary protein requirement in whiteleg shrimp reared in clear seawater system has been studied extensively (Colvin & Brand ; Smith, Lawrence & Strawn ; Kureshy & Davis ; Xia, Li, Wang, Rajkumar, Paramasivam, Vasagam & Wang ; Shahkar et al . ).…”

Evaluation of dietary soybean meal as fish meal replacer for juvenile whiteleg shrimp, Litopenaeus vannamei reared in biofloc system

“…The dietary protein of feed in the present study was formulated to contain 35-36% crude protein based on the requirement of whiteleg shrimp (Xia et al 2010;Shahkar et al 2014). In addition, the reference diet (control) contained 39% of fish meal (FM), because commercial shrimp feeds usually contain 25-50% of FM (Dersjant-Li 2002; Tacon and Barg 1998).…”

Effects of Dietary Protein Level on Growth and Ammonia Excretion of Leopard Coral Grouper, Plectropomus leopardus (Lacepede, 1802)

“…For example, ammonia excretion is greatly increased by white-leg shrimp when the dietary protein level is more than 43% (Xia et al 2010). Similarly, Jiang et al (2005) observed that turbot, Scophthalmus maximus excreted much higher quantity of ammonia in the environment when the dietary protein content was 54.3% compared to 52.1%.…”