Growth and physiological effects of replacing fishmeal with dry-extruded seafood processing waste blended with plant protein feedstuffs in diets for red drum (Sciaenops ocellatus L.)

The utilization of seafood processing waste (SPW) is a potential means reducing aquaculture’s reliance on marine forage fish. Therefore, in an effort to recycle valuable nutrients such as high-quality proteins and polyunsaturated fatty acids from potentially wasted processing, novel approach was evaluated enrich plant-derived feedstuffs. Four thermally-processed blends were manufactured by dry-extruding mixture either soybean meal (SBM) or distillers dried grains with solubles (DDGS) two different ratios SPW (60:40, 40:60 SPW: feedstuffs wet-weight basis). Five diets formulated contain 36 % crude protein 12 lipid, each the four comprising treatments (SBM 60:40, SBM 40:60, DDGS 40:60) which contributed 30 dietary protein, providing 45 FM remaining 25 %. reference diet had its provided solely FM. Groups fish (?98.8 g/fish) distributed into 15 fiberglass tanks (1200 L), fed experimental triplicate apparent satiation twice day for 8 weeks. At end trial, per tank their intestine samples collected flash frozen measure digestive enzymes activities. pooled treatment, re-distributed additional week. A transport-induced stress challenge then performed, transported hauling 2 h. Blood hematocrit, plasma cortisol, lactate osmolality, measured treatment at five sampling points: prior min after transportation, 24, 48 h challenge. Weight gain significantly affected treatments, all but outperforming those diet. Fish also hepatosomatic index. Dietary impacted, relative diet, activity trypsin, alkaline phosphatase, amylase. lower percentage red blood cells observed 60:40 when compared only before Based results this study, inclusion both favorable influence production performance drum while fishmeal oil formulation.