Home About us Contact
|
Home About us Contact | ||
|
|
||
G Shrimp (g + shrimp)
Selected AbstractsValidation of a Feeding Stimulant Bioassay Using Fish Hydrolysates for the Pacific White Shrimp, Litopenaeus vannameiJOURNAL OF THE WORLD AQUACULTURE SOCIETY, Issue 4 2009Michael Grey A protocol for testing feeding stimulants on Pacific white shrimp, Litopenaeus vannamei, is described. Thirty-five rectangular tanks (55 L volume) served as the test system into which ten 5,6 g shrimp were stocked. Every tank contained two bowls, each of which contained either 25 feed pellets of a Reference Diet or Test Diet (consisting of the Reference Diet with one test ingredient added). After 1 h, the difference between the number of pellets consumed of the Test Diet and the Reference Diet was used as the Response. Each of the four Test Diets contained a different salmon hydrolysate made from by-products of the Alaska fish processing industry (included at 50 g/kg). A fifth commercial shrimp diet was also tested. Each Test Diet was tested against the Reference Diet over a 4-d period in seven replicate tanks. The data were subjected to a one-way ANOVA and a confidence interval for each treatment response was calculated. The confidence interval was used to assess the test ingredient as a feeding stimulant. Treatment means were compared using Tukey's test (, = 5%). All the hydrolysates tested were found to act as feeding stimulants. [source] Effects of supplementing bioactive compounds to a formulated diet on sensory compounds and growth of shrimp, Litopenaeus vannamei (Boone, 1931)AQUACULTURE RESEARCH, Issue 10 2010Zhi Yong Ju Abstract Experimental diets were processed at the Oceanic Institute by adding various bioactive compounds (lutein, fucoxanthin, astaxanthins (Ax), glucosamine, carotenoid mix, phytosterol mix, bromophenol (Bp) mix or their combination) to a formulated (control) diet to examine their effects on sensory composition and growth of shrimp. These diets and a commercial feed were fed to ,1.6 g shrimp (Litopenaeus vannamei) in four replicates in an indoor laboratory under flow-through conditions for 8 weeks. Results indicated that all the supplementations of the bioactive compounds did not improve shrimp growth (0.79,0.97 g week,1) compared with that (0.94 g week,1) of the control diet (P>0.05). However, inclusion of lutein (200 mg kg,1) or carotenoid mix (827 mg kg,1) in the control diet (with supplemental Ax) resulted in much higher free Ax (48.3 or 46.5 mg kg,1) and esterified Ax (6.2 or 3.9 mg kg,1) content in shrimp tails than the control diet (28.4; 1.4 mg kg,1 respectively) (P<0.05). Inclusion of Bp (2 mg kg,1) in the control diet resulted in higher levels of Bp (160 ,g kg,1) in shrimp tail muscle than the control diet (81 ,g kg,1) (P<0.05). Three free amino acids, glycine, proline and alanine might be mainly responsible for the sweet taste of L. vannamei. The results suggest that the supplementation of the bioactive compounds may not affect shrimp growth performance, but some may affect the composition and taste of shrimp. [source] Stocking strategies for production of Litopenaeus vannamei (Boone) in amended freshwater in inland pondsAQUACULTURE RESEARCH, Issue 1 2008Bartholomew W Green Abstract The performance of the Pacific white shrimp Litopenaeus vannamei (Boone) under various stocking strategies was evaluated in earthen ponds filled with freshwater amended with major ions. Six 0.1-ha earthen ponds located in Pine Bluff, AR, USA, were filled with freshwater in 2003 and 2004, and potassium magnesium sulphate added to provide 50 mg K+ L,1 and stock salt added to provide 0.5 g L,1 salinity. In 2003, three ponds either were stocked with PL15 shrimp (39 PL m,2) for 125 days of grow out or with PL25 shrimp for 55 days (23 PL m,2) followed by a 65-day (28 PL m,2) grow-out period. In 2004, ponds were stocked with 7, 13 or 30 PL15 m,2 for 134 days of grow out. Salinity averaged 0.7 g L,1 during both years, and concentration of SO4,2, K+, Ca2+ and Mg2+ was higher, and Na+ and Cl, was lower in amended pond water than in seawater at 0.7 g L,1 salinity. Potassium concentration in amended water was 52,61% of the target concentration. Shrimp yields ranged from 3449 kg ha,1 in 2003 to 4966 kg ha,1 in 2004 in ponds stocked with 30,39 PL15 m,2 for a 125,134-day culture period. At harvest, mean individual weight ranged from 17.1 to 19.3 g shrimp,1. In ponds stocked with PL25 shrimp, yields averaged 988 and 2462 kg ha,1 for the 1st and 2nd grow-out periods respectively. Gross shrimp yield in 2004 increased linearly from 1379,4966 kg ha,1 with increased stocking rate. These experiments demonstrated that L. vannamei can be grown successfully in freshwater supplemented with major ions to a final salinity of 0.7 g L,1. [source] Growth and performance of Penaeus semisulcatus (de Haan) fed with two commercial shrimp feedsAQUACULTURE RESEARCH, Issue 15 2006Abdul Aziz Al-Ameeri Abstract Two feeding trials were conducted in two stages to compare growth and performance, grow-out (1,9 g b.w.) and fattening (13,19 g b.w.), of Penaeus semisulcatus. Shrimps were fed with two commercial feeds: P. monodon feed and P. japonicus feed. Both experiments were conducted using an indoor flow-through tank culture system. The results reveal that the growth performance of shrimp fed with P. japonicus feeds (0.91 g shrimp,1 week,1) for the grow-out stage was significantly better than shrimp fed with P. monodon feeds (0.63 g shrimp,1 week,1). The growth performance of shrimp fed with P. monodon feed (0.56 g shrimp,1 week,1) for the fattening stage was significantly better than shrimp fed with P. japonicus feed (0.42 g shrimp,1 week,1). The feed conversion ratios of both diets for the two sizes did not differ significantly. Thus, it is recommended that P. japonicus feeds be fed to P. semisulcatus during the grow-out stage. During the fattening stage, the better growth performance of the shrimp fed with P. monodon feed makes it a better feed. However, colour and overall acceptability of shrimp fed with P. japonicus feed were generally higher than those fed with P. monodon feed. [source] | ||||||||||