Yes, the probiotics can influence the digestive enzymes secretion in fish and crustaceans its leads to increasing the food intake, digestion, nutrient absorption and promote the nutrient accumulation in the body.
Yes, Probiotics can improve the body biochemical proximate composition in aquatics.
You can use these reference.
In post larvae, M. rosenbergii fed with bioencapsulated L. sporogenes diets had improved the tissues biochemical proximate composition (Seenivasan et al., 2012a). Supportively, Seenivasan et al. (2011, 2012b–d) noted the significant improvement in tissue biochemical proximate composition in Binifit_, L. sporogenes, B. subtilis and S. cerevisiae, incorporated diets fed M. rosenbergii PL. Supportively, Saad et al. (2009) reported that 1–4% Biogen_ supplemented diets had significantly increased the carcasses biochemical proximate composition of M. rosenbergii PL. Likewise, Venkat et al. (2004) stated the significant improvement in tissue biochemical proximate composition in bio-encapsulated L. acidophillus and L. sporogenes fed M. rosenbergii PL. Fernandez et al. (2011) reported that Lactic acid bacteria enhanced the biochemical proximate composition in juveniles of Penaeus indicus. Yu et al. (2009) pointed out that Bacillus spp., (0.15% and 0.30%) incorporated diets had significantly increased the biochemical proximate composition in white shrimp, Litopenaeus Vannamei. It has been reported that Bacillus spp., supplemented diets had significantly improved the carcass biochemical proximate composition of the rainbow trout, O. mykiss (Bagheri et al., 2008). Accordingly, Merrifield et al. (2009) reported that probiotics B. subtilis (7.79 log cfu g_1), Bacillus licheniformis and E. faecium incorporated diets had improved the body biochemical proximate composition of rainbow trout, O. mykiss. Also, Hidalgo et al. (2006) reported that probiotic B. toyoi (0.5, 1 and 2 g kg_1) and B. cereus (0.5, 1 and 2 g kg_1) incorporated diets had significantly improved the biochemical proximate composition of juvenile, Dentex dentex. El-Haroun et al. (2006) reported that different concentration of probioitics Biogens_ (0.5%, 1%, 1.5% to 2.0%) supplemented diets had improved the whole carcass biochemical proximate composition of Nile tilapia, O. niloticus.
Yes, there are many references that probiotics can change the chemical composition of aquatics carcass, such as: Seenivasan C. Radhakrishnan S. Muralisankar T. & Saravana Bhavan P. (2012) Bacillus subtilis on survival, growth, biochemical constituents and energy utilization of the freshwater prawn Macrobrachium rosenbergii post larvae. Egyptian Journal of Aquatic Research 38, 195–203.