The effects of krill hydrolysate-supplemented soya-bean based diets on the growth, colouration, amino and fatty acid profiles of juvenile American lobster,Homarus americanus

Abstract

The feasibility of soya-based diets for pounded American lobster, Homarus americanus, was investigated using diets (40% protein) of low-fat soya-bean meal (SBM) containing various proportions of freeze-dried krill hydrolysate (FDKH) at 0, 12.5, 25, 50, 75, and 100% of dietary protein, in a 60-day trial using stage 5 juveniles. Diets of fresh bluemussel, Mytilus edulis, and a diet of 100% of protein from ®sh meal (FM), approximating the industry diet of ®sh, were included for comparison. Speci®c growth rates (SGR) were not signi®cantly dierent in all krill-containing diets, 100% FM and mussel diets. Juveniles on the mussel diet and the 75 and 100% FDKH diets had signi®cantly higher maximum body weight gains (BWG), longer survivals (days in culture) and shorter moulting cycles. Juveniles deriving 100% of dietary protein from SBM failed to moult and had the lowest SGR and BWG, and the shortest survival period. Carotenoid content (mg kg )1 dry weight), n-3 HUFA pro®les (% of total fatty acids) and arginine (% of total amino acids) in the carcass correlated with dietary pro®les (% of dry diet) and the level of dietary FDKH. Dietary SBM increased carcass 18:2n-6. Soya-bean meal supplemented with FDKH may provide up to 87.5% of dietary protein in arti®cial diets without compromising short-term BWG. KEY WORDS

The fishery for Antarctic krill – recent developments

“…2006; Gaber 2005). However, krill is most commonly used as a high‐value additive to aquaculture feeds (Floreto et al. 2001) rather than the primary ingredient.…”

“…Experiments have shown that krill meal has a nutritional value equal to, or surpassing, that of regular fish meals when used as a substitute in the diets of various farmed species, including Atlantic cod, Atlantic salmon and Pacific white shrimp (Yoshitomi et al 2007;Karlsen et al 2006;Opstad et al 2006;Gaber 2005). However, krill is most commonly used as a high-value additive to aquaculture feeds (Floreto et al 2001) rather than the primary ingredient. Given proven benefits of utilization of krill meal and oils [the addition of fish oil to meals is used to boost Omega-3 content of farmed species (IFFO, 2008)] in fish meals and the decline of traditional sources of these meals and oils, krill is being examined as a means to satisfy demand in a market niche that will be under increasing pressure as traditional fish stocks continue to decline.…”

The effects of pre-digested protein sources on the performance of early–mid stage Panulirus ornatus phyllosoma

“…Diets containing protein hydrolysate have been previously shown to improve growth in several larval fish species (Carvalho et al, 1997;Ovissipour et al, 2014;Srichanun et al, 2014), as well as in juvenile (Floreto et al, 2001;Hernández and Olvera-Novoa, 2011) and adult crustaceans (Cordova-Murueta and Garcia-Carreno, 2002;Nguyen et al, 2012). The growth benefits of hydrolysed protein have largely been attributed to the increased abundance of short-chain peptides and FAAs released by the enzymatic process (Aksnes et al, 2006;Bui et al, 2014;Zheng et al, 2012).…”

Innovative protein sources in shrimp (Litopenaeus vannamei) feeding

“…; Hertrampf & Piedad‐Pascual ; Floreto et al . ; Córdova‐Murueta & García‐Carreño ; Quinto et al . )).…”

“…The protein hydrolysates could enhance the protein utilisation. Litopenaeus vannamei and Homarus americanus fed with diets supplemented with fish protein hydrolysates show increased growth (Anggawati et al 1990;Hertrampf & Piedad-Pascual 2000;Floreto et al 2001;C ordova-Murueta & Garc ıa-Carreño 2002;Quinto et al 2018)). Hern andez et al (2011) have found that, via lactic acid fermentation, tuna by-product protein hydrolysate (TBPH) improves the digestibility and amino acid profile of porcine meal-based diets, and thus enhances the growth response of L. vannamei.…”