Effects of phytase pretreatment of soybean meal and phytase-sprayed in diets on growth, apparent digestibility coefficient and nutrient excretion of rainbow trout (Oncorhynchus mykiss Walbaum)

Aquaculture feed formulation has recently turned its focus to reduce the reliance on marine-derived resources and utilise alternative feedstuffs, as an approach to improve the environmental sustainability of the aquaculture sector. The fish oil market is highly volatile, and availability of this commodity is continuously decreasing for use in aquaculture. Currently, a growing number of commercial efforts producing microalgae are providing omega 3-rich oil for sustainable aquaculture feed. This study was focused to determine the nutrient digestibility of a marine microalga, Schizochytrium spp., which is rich in docosahexaenoic acid (DHA) and long-chain polyunsaturated fatty acids (LC-PUFA), as a novel dietary lipid source that could be utilized effectively by rainbow trout (Oncorhynchus mykiss). A whole-cell Schizochytrium spp. biomass was used in the digestibility experiment at two different temperatures, 8 °C and 15 °C. No significant differences were detected between the two temperatures for the apparent digestibility coefficients (ADCs) of the dry matter (94.3 ± 4.9%), total lipids (85.8 ± 0.0%), crude proteins (89.5 ± 1.8%), energy (83.1 ± 1.7%) and fatty acids (85.8 ± 7.5%). The ADCs of the nutrients, energy, DHA and other fatty acids showed that Schizochytrium spp. is a high-quality candidate for fish oil substitution and supplement of LC-PUFA in fish feed with vegetable oils.

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Soybean meal level and probiotics in first feeding fry diets alter the ability of rainbow trout Oncorhynchus mykiss to utilize high levels of soybean meal during grow-out

Aquaculture ◽

10.1016/j.aquaculture.2009.04.013 ◽

2009 ◽

Vol 293 (3-4) ◽

pp. 195-203 ◽

Cited By ~ 26

Author(s):

Wendy M. Sealey ◽

Frederic T. Barrows ◽

Charles E. Smith ◽

Kenneth Overturf ◽

Scott E. LaPatra

Keyword(s):

Rainbow Trout ◽

Oncorhynchus Mykiss ◽

Soybean Meal ◽

Rainbow Trout Oncorhynchus Mykiss ◽

First Feeding

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Twin-screw Extrusion Processing of Vegetable-Based Rainbow trout (Oncorhynchus mykiss) Feeds Using Graded Levels of High Protein Fermented Soybean Meal (FSBM)

10.13031/2013.42157 ◽

2012 ◽

Author(s):

Parisa - Fallahi ◽

Kasiviswanathan Muthukumarappan ◽

Kurt A Rosentrater

Keyword(s):

Rainbow Trout ◽

Oncorhynchus Mykiss ◽

Soybean Meal ◽

Twin Screw Extrusion ◽

Fermented Soybean Meal ◽

Fermented Soybean ◽

Rainbow Trout Oncorhynchus Mykiss ◽

Extrusion Processing ◽

Screw Extrusion ◽

Twin Screw

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Effect of animal and vegetal protein diets on feed intake and apparent digestibility of nutrients in rainbow trout (Oncorhynchus mykiss) infected by Aeromonas salmonicida, with and without chronic hypoxia stress

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f98-077 ◽

1998 ◽

Vol 55 (9) ◽

pp. 2019-2027 ◽

Cited By ~ 7

Author(s):

H Néji ◽

J de la Noüe

Keyword(s):

Rainbow Trout ◽

Oncorhynchus Mykiss ◽

Feed Intake ◽

Chronic Hypoxia ◽

Phosphate Buffer Solution ◽

Aeromonas Salmonicida ◽

Animal Protein ◽

Fish Feed ◽

Apparent Digestibility ◽

Rainbow Trout Oncorhynchus Mykiss

This study was undertaken to investigate the effects of bacterial infection (Aeromonas salmonicida) and chronic hypoxia on mortality, feed intake, and apparent digestibility of each of two diets in rainbow trout (Oncorhynchus mykiss). The diets were isonitrogenous (gross basis); one was based mainly on animal protein and the other on vegetal protein. In each of two separate and successive experiments, where the first served as a control for the second, fish were immersed on day 0 (d0) in either a sterile phosphate buffer solution (first experiment) or a suspension of A. salmonicida (second experiment). Thereafter, the fish were either exposed on d2 for 12 days to hypoxic conditions (60% of water oxygen saturation) or maintained under normal conditions. Feed intake was measured daily, while apparent digestibility coefficients for gross energy, dry matter, and crude protein were measured on d0, d2, d5, d9, d11, and d14. Among all infected fish, feed intakes were reduced (P < 0.05), regardless of the source of dietary protein or the degree of water oxygenation. Also, regardless of infection, the feed intakes of hypoxic fish that were fed the vegetal protein based diet were significantly less than those of fish that were fed the animal protein based diet. This response, however, was transitory, since normal levels of feed intake in the former fish were found by d3. The apparent digestibility coefficients for all parameters were unaltered by hypoxia (P > 0.05), but they were significantly reduced (P < 0.05) by A. salmonicida infection, especially during the critical period of infection (d5 and d9).

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