Bioactive Compounds of Nutraceutical Value from Fishery and Aquaculture Discards

foods Review Bioactive Compounds of Nutraceutical Value from Fishery and Aquaculture Discards Mirko Mutalipassi 1,† , Roberta Esposito 2,3,†, Nadia Ruocco 2,†, Thomas Viel 1, Maria Costantini 2,* and Valerio Zupo 1,* 1 Stazione Zoologica Anton Dohrn, Department of Marine Biotechnology, Villa Dohrn, Punta San Pietro, 80077 Naples, Italy; [email protected] (M.M.); [email protected] (T.V.) 2 Stazione Zoologica Anton Dohrn, Department of Marine Biotechnology, Villa Comunale, 80121 Naples, Italy; [email protected] (R.E.); [email protected] (N.R.) 3 Department of Biology, University of Naples Federico II, Complesso Universitario di Monte Sant’Angelo, Via Cinthia 21, 80126 Naples, Italy * Correspondence: [email protected] (M.C.); [email protected] (V.Z.) † These authors contributed equally to this work. Abstract: Seafood by-products, produced by a range of different organisms, such as fishes, shellfishes, squids, and bivalves, are usually discarded as wastes, despite their possible use for innovative formulations of functional foods. Considering that “wastes” of industrial processing represent up to 75% of the whole organisms, the loss of profit may be coupled with the loss of ecological sustainability, due to the scarce recycling of natural resources. Fish head, viscera, skin, bones, scales, as well as exoskeletons, pens, ink, and clam shells can be considered as useful wastes, in various weight percentages, according to the considered species and taxa. Besides several protein sources, still underexploited, the most interesting applications of fisheries and aquaculture by-products are Citation: Mutalipassi, M.; Esposito, foreseen in the biotechnological field. In fact, by-products obtained from marine sources may supply R.; Ruocco, N.; Viel, T.; Costantini, M.; bioactive molecules, such as collagen, peptides, polyunsaturated fatty acids, antioxidant compounds, Zupo, V. Bioactive Compounds of and chitin, as well as catalysts in biodiesel synthesis. In addition, those sources can be processed Nutraceutical Value from Fishery and via chemical procedures, enzymatic and fermentation technologies, and chemical modifications, to Aquaculture Discards. Foods 2021, 10, obtain compounds with antioxidant, anti-microbial, anti-cancer, anti-hypertensive, anti-diabetic, and 1495. https://doi.org/10.3390/foods anti-coagulant effects. Here, we review the main discards from fishery and aquaculture practices 10071495 and analyse several bioactive compounds isolated from seafood by-products. In particular, we Academic Editors: Ermelinda Prato focus on the possible valorisation of seafood and their by-products, which represent a source of and Francesca Biandolino biomolecules, useful for the sustainable production of high-value nutraceutical compounds in our circular economy era. Received: 13 May 2021 Accepted: 25 June 2021 Keywords: wastes; seafood; aquaculture; fishery; functional foods; bioactive compounds; biotechnol- Published: 28 June 2021 ogy; sustainability Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affil- 1. Introduction iations. 1.1. Fishery/Aquaculture Practices and Targeted Organisms Global seafood production in the year 2016 was assessed to be about 171 million tons (Figure1)[ 1]. Fishery activities and aquaculture generate a wide array of different wastes. First of all, plastic wastes are heavily produced due to abandoned, lost or discarded Copyright: © 2021 by the authors. fishing gear bilges, as well as other wastes from vessel operations. In parallel, fisheries Licensee MDPI, Basel, Switzerland. bycatch discards are produced through low-selective fishing gears, not equipped to exclude This article is an open access article non-targeted organisms. These latter methods may catch significant amounts of finfish distributed under the terms and species, juveniles, benthic animals, marine mammals, marine birds and vulnerable or conditions of the Creative Commons endangered species, which are often immediately discarded. Moreover, unmarketable Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ organisms due to small size, as well as damaged and inedible specimens, cannot be retained 4.0/). due to management or quota restrictions [2]. Foods 2021, 10, 1495. https://doi.org/10.3390/foods10071495 https://www.mdpi.com/journal/foods Foods 2021, 10, x FOR PEER REVIEW 2 of 23 dangered species, which are often immediately discarded. Moreover, unmarketable organisms due to small size, as well as damaged and inedible specimens, cannot be retained due to management or quota restrictions [2]. Within fisheries management, discarding is currently one of the most important issues, both from the economic and the environmental point of view [3]. The Food and Ag- riculture Organization (FAO) Fisheries Glossary describes it as “that proportion of the total organic material of animal origin in the catch which is thrown away or dumped at sea, for whatever reason. It does not include plant materials and postharvest wastes such as offal. The discards may be dead or alive”. In the United States, during the period 2009– 2013, about 47% of the edible seafood was not used for human consumption, representing a large percentage of harvest discarded as by-catch during commercial fishing [4]. A comparable situation was found in Europe, where the ratio between seafood consumed and discarded as waste is estimated to be 1:1 [5]. Scientists and fishery managers underlined the importance of reducing these wastes, minimizing the ecological impacts of fishery [6– 12]. In addition, a strong diversification of marine harvest was recommended, to reduce Foods 2021, 10, 1495the fishing pressure on current target species by using those that are not considered inter-2 of 22 esting for commercial purposes [12]. Figure 1. GlobalFigure 1.seafoodGlobal seafoodproduction production (updated (updated in 2016) in 2016) according according to to Pauly Pauly et al.al. [ 1[1].]. Active bottom-contactWithin fisheries gears management,(e.g., bottom discarding trawls) are is currently widespread one of thelarge-scale most important fishing issues, both from the economic and the environmental point of view [3]. The Food and Agriculture techniques, generally known to produce the highest discarding as compared to any other Organization (FAO) Fisheries Glossary describes it as “that proportion of the total organic fishing gear whichmaterial in many of animal countries origin in are the becoming catch which a is real thrown concern away or[2]. dumped Thus, atshrimp sea, for fish- whatever eries, particularlyreason. in tropical It does waters, not include had plantthe highest materials total and amount postharvest and wastes proportion such as of offal. dis- The cards with a weighteddiscards average may be dead rate orof alive”. 62% [2,13–15]. In the United Shrimp States, trawling during the produces period 2009–2013, the high- about est level of discard/catch47% of the ediblerations seafood if compared was not with used forother human fishing consumption, techniques representing with values a large ranging from 3:1percentage to 15:1, ofaccording harvest discarded to target as by-catchspecies,during seasons commercial and areas fishing [16]. [4 ].Along A comparable the situation was found in Europe, where the ratio between seafood consumed and discarded as Indian coasts, fisherywaste is bycatch estimated is to mainly be 1:1 [5 ].comp Scientistsosed and of fisheryhigh proportions managers underlined of juveniles the importance and sub-adult individualsof reducing of commercially these wastes, minimizing important the species. ecological It was impacts estimated of fishery that [6–12 in]. 2008 In addition, the a annual economicstrong loss diversificationdue to juveniles of marine in fishing, harvest wasby trawlers, recommended, purse to seiners, reduce the ring fishing seiners pressure and mini-trawlerson currenttogether, target was species about by US$ using 19.445 those thatmillion are not yr− considered1 [17]. If compared interesting to for shrimp commercial fisheries, finfishpurposes trawling [12 has]. a relatively low discard rate, contributing to a substantial total amount of discardsActive worldwide. bottom-contact In gears addition, (e.g., bottom tuna and trawls) high are migratory widespread species large-scale con- fishing techniques, generally known to produce the highest discarding as compared to any other tribute to total bycatchfishing gear with which up to in 28.5% many of countries the weighted are becoming average a realdiscard concern rate. [2 In]. contrast, Thus, shrimp small-scale andfisheries, artisanal particularly fisheries inexhibit tropical very waters, low had or the negligible highest total discards, amount andalthough proportion in of some areas, for discardsexample with in athe weighted Mediterranean, average rate the of total 62% [2amount,13–15]. Shrimpof discards trawling can produces still be the very substantialhighest due to level a huge of discard/catch presence of rations artisanal if compared fleets [18,19]. with other fishing techniques with values ranging from 3:1 to 15:1, according to target species, seasons and areas [16]. Along the Indian coasts, fishery bycatch is mainly composed of high proportions of juveniles and sub-adult individuals of commercially important species. It was estimated that in 2008 the annual economic loss due to juveniles in fishing, by trawlers, purse seiners, ring seiners and mini-trawlers together, was about US$ 19.445 million yr−1 [17]. If

Load more