Hydrolysates from scallop and squid processing byproducts as specialty aquafeed ingredients

Authors: LEE, CHONG - University Of Rhode Island; VOLSON, BARRY - University Of Rhode Island; KANG, BOUHEE - University Of Rhode Island; KARAYANNAKIDIS, PANAYOTIS - University Of Rhode Island; GAMEZ, ELIZABETH - University Of Rhode Island; MILLER, JONAS - University Of Rhode Island; BENGSTON, DAVID - University Of Rhode Island; Wolters, William; Burr, Gary; Barrows, Frederic

Submitted to: Annual Meeting World Aquaculture Society
Publication Type: Abstract Only
Publication Acceptance Date: 12/1/2014
Publication Date: 5/26/2015
Publication URL: https://www.was.org/meetingabstracts/ShowAbstract.aspx?Id=35138
Citation: Lee, C., Volson, B., Kang, B., Karayannakidis, P., Gamez, E., Miller, J., Bengston, D., Wolters, W.R., Burr, G.S., Barrows, F. 2015. Hydrolysates from scallop and squid processing byproducts as specialty aquafeed ingredients. Annual Meeting World Aquaculture Society. 1:65.

Interpretive Summary:

Technical Abstract: Around 9,000 MT of squid (Loligo pealei) is landed annually in Rhode Island, USA, most of which is processed resulting in 40-50% unutilized byproducts (about 3,500 MT). On the other hand, the sea scallop (Placopecten magellanicus) resource off New England is currently at historic high levels of 22,700 MT (meat weight) with potential generation of around 74,500 MT of viscera (23% viscera to 7% meat). Both squid processing byproduct (SPB) and scallop viscera (SV) contain high levels of protein and excellent amino acid and fatty acid profiles pointing to the bioconversion of SPB and SV into high value hydrolysates for commercial aquafeed applications. We are working to find innovative ways to solve the costly disposal problem of processing waste through hydrolysis and production of dry hydrolysates that enhance fish feeding and growth. Byproducts were homogenized and subjected to hydrolysis at 55°C for 1.5 h followed by pasteurization at 75°C for 30 min. The resulting hydrolysates were plate-coat dried to produce dry hydrolysate powder. Two 8-week feeding trials were conducted: 1st to compare squid, scallop and mixed 60% Scal-40% Sq hydrolysates at 5% inclusion along with fish meal (FM) and soybean meal (SBM, 60% FM replacement) using summer flounder (Paralichthys dentatus) and European seabass (Dicentrarchus labrax); and 2nd to compare wet and dry hydrolysates by monitoring feed consumption, feeding attractability, and growth. In both summer flounder and European seabass, the scallop hydrolysate diet outperformed the rest in feed consumption, weight gain, feed conversion ratio (FCR) and feeding attractability. The dry scallop hydrolysate diet outperformed the wet hydrolysate diet in feed consumption, weight gain, and FCR in European seabass, suggesting that the heat applied during drying did not adversely affect the nutritional quality of hydrolysate, and may have enhanced the palatability. Other works on impregnated SBM as a new class ingredient and feeding trials on barramundi, yellowtail, and Atlantic salmon will be included in the presentation.