Dry matter, protein, and energy digestibility of diets for juvenile Pacific white leg shrimps (Litopenaeus vannamei) reared at different salinity levels

Abstract

This study evaluated the effect of low, medium, and high-water salinity (5, 35, and 50 ppt) on the apparent dry matter, protein, and energy digestibility of two formulated and six commercial diets for juvenile whiteleg shrimp, Litopenaeus vannamei, in a 120-day trial. Digestibility was determined in vivo using chromic oxide as an inert diet marker. Hydrostability in pellets varied from 86.8% to 99.9%; dry matter digestibility varied from 49.1% to 64.1%; protein digestibility showed greater variations at all salinities (56.9%-85.8%); and energy digestibility ranged from 70.1 to 86.4%. Salinity had a significant effect on dry matter, protein, and energy digestibility. Using a principal component analysis (PCA) with a covariance matrix, our findings suggested that the E2 (fishmeal-based formulation) diet and 35 ppt salinity provided optimum hydrostability and digestibility to Pacific white leg shrimp juveniles.

The effect of defatted black soldier fly (Hermentia illucens) meal inclusion in the formulated feed on the pellet stability at different salinity levels

“…Of concern is that in the current study, the dry matter loss rate in feed exposed to higher salinity was lower when compared to feed exposed to low salinity. The same results have been also reported in artificial feeds made for vannamei shrimp, L. vannamei [29]. The formulated feed stability in the water have been reported to be affected significantly by the feed ingredients [4,20,[27][28][29]34], binders [5,19] and also environmental factor such as salinity [29,32].…”

“…The same results have been also reported in artificial feeds made for vannamei shrimp, L. vannamei [29]. The formulated feed stability in the water have been reported to be affected significantly by the feed ingredients [4,20,[27][28][29]34], binders [5,19] and also environmental factor such as salinity [29,32].…”

“…The increase of the dry matter loss due to the fishmeal substitution indicates that fishmeal as the source of protein in the reference feed (BSF0) has superior physical properties compared to defatted BSF which led to the better feed stability. However, the amount of dry matter loss in the feed that received defatted BSF meal substitution (BSF25, BSF30 and BSF50) was still within the acceptable range and relatively small compared to several previous studies which focusing on the physical formulated feed properties for crustaceans [10,19,[27][28][29]. Salinity is one of the water quality parameters which play important roles in every brackish or seawater aquaculture activities and become limiting factor of some crustacean species [30,31].…”

Chemical composition of chicken intestines pre-dried with vegetable meals: alternative protein for aquaculture

“…Al formular dietas para peces y camarones, se debe analizar el aporte de nutrientes en las raciones, que suplan los requerimientos nutricionales con el mínimo costo, muy importante cuando se utilizan materias primas que varían significativamente (p<0.05) en su composición nutricional y costos (Tablas 2,3). Méndez-Martínez et al (24), utilizaron el PCA para evaluar las variables: hidroestabilidad de los gránulos, digestibilidad de la proteína, energía y materia seca en dietas para juveniles del camarón (Litopenaeus vannamei), en un total de veinticuatro tratamientos y como resultados obtuvieron valores en el CP1: 48,3% y en el CP2: 24,9%, en conjunto explicaron el 73,2% de las diferencias en las respuestas de los indicadores investigados. Estos autores encontraron que para CP1, las principales diferencias se observaron en la materia seca, proteína y energía y para CP2 fue la hidroestabilidad en los gránulos.…”

“…Estos autores encontraron que para CP1, las principales diferencias se observaron en la materia seca, proteína y energía y para CP2 fue la hidroestabilidad en los gránulos. Esto les permitió transformar un conjunto de variables correlacionadas, en un nuevo conjunto de variables no correlacionadas y reducir la dimensionalidad en la que se expresaba el conjunto original de veinticuatro tratamientos, proporcionando los mejores tratamientos (24).…”