## 1 Introduction  
Marine shrimp are important aquaculture species, with the combined global production of the two main farmed species, the Pacific whiteleg shrimp (_Litopenaeus vanname_) and black tiger shrimp (_Penaeus monodon_), reaching nearly five million tonnes in 2016 [1]. As feed is the biggest economic cost in shrimp farming, continual measures are being undertaken to improve shrimp diets [2]. For aquaculture feeds, the ultimate goal is to produce diets that produce favourable growth rates, animal health, and feed efficiencies that delivers a socially responsible and affordable product for the consumer. As such, more environmentally and economically sustainable ingredients such as plant bioactives are being increasingly utilised in aquafeed formulations [3]. Shrimp farming is faced with a range of additional animal welfare challenges that are negatively affecting productivity around the world. This includes increased disease burden and spread, higher stocking densities, and suboptimal water quality, all cited as contributing factors [4]. The common factor present in each of these conditions is an increase in oxidative stress. For example, a range of anti-oxidant enzymes are linked to the immune response in shrimp and infection with viruses such as white-spot syndrome virus, or the use of antibiotics such as enrofloxacin, all shown to stimulate the production of reactive oxygen species [5; 6; 7]. This increased oxidative stress leads to interference with the immune response and, ultimately, reduced production outcomes and total biomass yields [7]. In an attempt to increase biomass yields, the use of antibiotics for growth promotion has been adopted in aquaculture in a similar manner to their use in agriculture [8]. This dependence on antibiotics for both agriculture and aquaculture promotes antibiotic resistance in bacterial pathogens that cause disease [9]. As a consequence, increased regulatory and consumer pressure is encouraging the industry to limit the use of antibiotic growth promoters. In addition, some antibiotics have also been demonstrated to increase the production of reactive oxygen species in shrimp, which further strains the immune response [5]. There is now a need to identify novel ingredients and additives that maximise shrimp growth and health, whilst also aiding in the sustainable expansion of global shrimp aquaculture. Natural antioxidant compounds, such as polyphenols, are a potential option for enhancing production outcomes as they are abundant in plants and have a long evolutionary history of consumption in omnivorous/herbivorous species. Plant polyphenols are a broad range of secondary metabolites containing one or more aromatic rings and at least two hydroxyl groups [10]. Polyphenols are associated with a variety of positive effects on health, through a diverse range of proposed mechanisms. These mechanisms include modulation of metabolism, interaction with gut bacteria, and as a scavenger of free radicals [11]. Furthermore, evidence generated by animal and human studies shows that the anti-oxidant, anti-inflammatory, and anti-microbial properties [12; 13; 14] (of polyphenols may be beneficial as preventative agents against many non-communicable and microbial diseases in animals, including aquatic species [15]. The inclusion of a wide range of polyphenol-rich ingredients into standard basal diets has been studied in shrimp nutrition with observed mixed effects, suggesting that the response of the shrimp may be specific to the specific polyphenol composition of the diet [16; 17; 18; 19; 20; 21; 22; 23]. Many studies have linked plant polyphenol intake with an increased resistance to infectious disease [24; 25; 26; 27; 28]. However, the specific effect of sugarcane-derived compounds has not been explored in black tiger shrimp.