Rapeseed use in aquaculture

Abstract

-The main problem of the aquaculture sector is the provision of suitable and sufficient fish feed, because the most important protein source in aquaculture, the fish meal, is a limited resource. Due to their high nutritional value the rapeseed proteins have great potential as an alternative protein source for the fish nutrition. Therefore, the aim of this work is to develop a manufacturing process of high quality rapeseed protein concentrates, which can replace the limited marine resource. For this purpose, small pilot scale processing procedures were performed to produce a rapeseed protein concentrate (RPC). The meal for protein extraction was prepared by gentle meal processing. Rapeseed protein fractions were prepared by an aqueous extraction procedure. The obtained protein solution is further purified and then dried. The investigated rapeseed protein extraction process provides RPC with high nutritional value and low levels of antinutritional factors. From the nutritional point of view the produced RPC can be compared with the fishmeal. Its amino acid profile reflects the amino acid demands of fish. The obtained RPC was utilized for experimental setups of fish meal replacement in diets for rainbow trout, turbot, common carp and wels catfish. Experimental results from the conducted feeding trials demonstrate an enormous potential of RPC as protein source in aquafeeds. The highest fishmeal replacement level (up to 100%) was observed in the feeding trials with rainbow trout. Therefore, especially in the nutrition of rainbow trout, RPC was identified as an excellent fishmeal alternative.

Comparative biochemical profile of protein-rich products obtained from industrial rapeseed meal

“…Interestingly, a minor band at around 66 kDa, which was not detected by analyzing program but was visible on Fig. 1, was also observed and reported as not defined by Adem et al (2014) who studied SDS-PAGE protein profile of a rapeseed protein concentrate.…”

“…Most probably, this is due to heat treatment of the rapeseeds during the oil production process (Bell and Keith, 1991;Mansour et al, 1993). Slawski et al (2012) and Adem et al (2014), who explored the suitability of rapeseed meal as a protein source in aquaculture, also used ethanol pre-treatment of rapeseed meal as an approach for reduction of antinutrients.…”

Identification of phytic acid mutants in oilseed rape (Brassica napus) by large‐scale screening of mutant populations through amplicon sequencing

“…To date, no low phytic acid oilseed rape cultivars are available for commercialization of oilseed rape meal as a protein source. Therefore, external phytases are applied to the meal for improving the meal quality (Adem et al , ). In this scenario, mutational breeding is an alternative for identification of low phytic acid mutants.…”

Value of hydroalcoholic treatment of rapeseed for oil extraction and protein enrichment

“…After oil extraction, the rapeseed meal contains around 35-40% proteins, plus carbohydrates (30-35%), crude fiber (10-15%), minerals (5-10%), and up to 10% secondary plant metabolites (von der Haal et al, 2014;Carré et al, 2016). However, the current rapeseed oil production-line configurations limit the production of a digestible protein-rich meal (Grala et al, 1994;Adem et al, 2014;Mosenthin et al, 2016). The presence of anti-nutritional components (fibers, glucosinolates, phytates and phenolics) and the loss of protein solubility during the crushing process hinders further value recovery (Bell, 1993;Quinsac et al, 1994;Adem et al, 2014).…”