Characterization and potential strategies for the valorisation of the Southwest Atlantic butterfish (Stromateus brasiliensis)

Abstract

The waste of fish resources constitutes a serious environmental problem that must be avoided. The valorisation of by-catch species and decreasing the discard rate constitute a more efficient and sustainable use of these marine biomasses. In this work, we characterize and propose different potential uses for Stromateus brasiliensis, another frequently discarded (C 90%) and poorly studied by-catch species captured in the South Atlantic Ocean (FAO 41) by trawler fishing fleets. Furthermore, in the case of this species, freezing and frozen storage of the whole fish is the only strategy currently employed for its exploitation. The results revealed that muscle from S. brasiliensis presented a high content of polyunsaturated fatty acids (20.34%) and that the concentrations of both total diacyl glyceryl ethers (2.41%) and heavy metals (Hg 0.038, Pb 0.006 and Cd 0.018 mg/kg) were below the established limits for safe human consumption. Likewise, the protein hydrolysates proved to be a good source of amino acids for human consumption or animal feeding. Minced muscle blocks could be made by a mechanical separation process of the flesh, and the composition of minced muscle did not differ much from that of the whole fish. Furthermore, this process allows the incorporation of cryoprotectants and antioxidants to extend the frozen shelf life of this fatty fish. An extraction process from mechanically mixed skin and bones yielded a good source of collagen that should not be neglected.

Real-Time In Situ Screening of Omega-7 Phospholipids in Marine Biological Resources Using an iKnife-Rapid-Evaporative-Ionization-Mass-Spectrometry-Based Lipidomics Phenotype

“…As shown in Figure 2 components were neglected. Thus, the ionization efficiency of various lipid species was nearly the same after correction for the 13 C isotope within experimental error. 9 According to the accurate mass information and previous studies, 18−20 a total of 12 n-7 PMS were tentatively identified (Table 1), including four PC, five PE, and three PI molecular species.…”

“…8 Tuna (T. albacores) and butterfish (S. brasiliensis) are important commercial fish species with pleasing flavor and health benefits. 10,13 Hairtail (T. lepturus) is the largest catch of marine fish and viewed as a highly nutritious and delicious aquatic product in China. 14 This study aims to establish a fast iKnife REIMS method for real-time in situ screening of n-7 phospholipids in salmon, prawn, bluefin tuna, hairtail, and butterfish through a lipidomics phenotype and multivariate statistical analysis.…”

“…albacores) and butterfish (S. brasiliensis) are important commercial fish species with pleasing flavor and health benefits. , Hairtail (T. lepturus) is the largest catch of marine fish and viewed as a highly nutritious and delicious aquatic product in China …”