Two experiments were conducted to investigate the active components of soybean lecithin for juvenile Litopenaeus vannamei. It was found that the brackish medium enabled better shrimp development than the seawater medium, provided that the parameters and material in suspension are kept at stable levels, with the former medium providing shrimp an environment rich in food and free of pathogens. The treatments were undertaken in two different culture media, one in brackish water and the other in seawater, in which the length and weight of the animals was measured, with their behavior during the bioassay also recorded. The use of a combination of shrimp feed and refined sugar as a carbon source enabled the development of floccules, not only enabling the identification of those high-performing organisms and their development in the medium, but also facilitating shrimp capture in order to evaluate growth during each treatment. With the objective of evaluating the results of the use of Biofloc in aquaculture, a simulation of an aquaculture facility using Biofloc culture techniques was conducted under controlled laboratory conditions. The results permit concluding that S.presso is suitable for use as a source of polyunsaturated fatty acids for brine shrimp enrichment with the intent of using them as fish food.īiofloc is a new system, little known or applied in Mexico, that offers a high level of sustainability for aquaculture due to its great versatility in terms of nutrient recycling, which enables savings in feed costs and a significant reduction in water exchange. Additionally, it was confirmed that the supplement S.presso increased brine shrimp growth slightly in comparison to that of the control group, but the differences were statistically insignificant. The results indicate that while S.presso increased nauplius mortality slightly, administering the appropriate dose reduced losses to a very low level (from 12.5% with a single dose to 8.6% with the recommended dose divided into to equal parts). Four different enrichment protocols were investigated: the supplement was given in one or two doses at various time intervals. The aim of the study was to determine the impact the commercial supplement S.presso (INVE Aquaculture, Belgium), a source of polyunsaturated fatty acids to enrich the proximate composition of brine shrimp (Artemia sp.), had on their growth and mortality. Impact of enriching larval brine shrimp (Artemia sp.) with a supplement containing polyunsaturated fatty acids on their growth and mortality – Arch. In addition, the present study showed that increasing the dietary lipid level had an effect on lipid composition of shrimp, by increasing lipid deposition in hepatopancreas and muscle tissue, but without a significant effect on growth. Moreover, depressed growth was observed in shrimp fed diets with the HUFA mixture supplemented at 2%. Results suggested that this shrimp species appeared to be able to satisfy its n-3 HUFA requirements when they were supplied at 0.5% of diet this dietary level may be even lowered. An increase in quantitative requirements for EFA with increasing supplementation level of dietary lipid was not demonstrated. A factorial experiment with three dietary lipid levels (3, 6, and 9%) and three dietary levels (0.5, 1, and 2%) of a mixture of n-3 highly unsaturated fatty acids (HUFA) was used. A 6-wk feeding trial was conducted to evaluate the effect of various dietary lipid levels on quantitative requirements for essential fatty acids (EFA) by juvenile Pacific white shrimp Litopenaeus vannamei.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |