Browsing by Author "Rojas-De-Los-Santos, Estrellita"

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    A New Species of Mymarothecium tantaliani n. sp (Monogenea: Dactylogiridae) in the Gills of Gamitana Colossoma macropomum (Cuvier) from Madre de Dios, Peru
    (Springer Science and Business Media LLC, 2020-7-12) Cayulla-Quispe, David; Mondragón-Martínez, Aarón; Rojas-De-Los-Santos, Estrellita; Garcia-Candela, Enrique; Babilonia-Medina, Jorge; Martínez-Rojas, Rosa
    Introduction: Members of the genus Mymarothecium Kritsky, Boeger & Jégu, 1996 infect characiform fish in the Amazon River Basin. Although the Peruvian Amazon hosts rich fauna of fish, the taxonomic diversity of parasitic organisms such as Mymarothecium has been few explored. A new species of Mymarothecium in Colossoma macropomum Cuvier, from the southeast of the Peruvian Amazon, is described. Methods: Monogeneans were isolated from gills of C. macropomum, fixed in formaldehyde in 4% solution. For morphological examinations were stained with Gomori’s trichrome and others were clarified with Hoyer’s medium. Results: Mymarothecium is the third species of the genus recorded in C. macropomum. These new species have been characterized by a slightly sigmoid male copulatory organ (MCO) and the accessory piece with sinuous distal rod with hook-shaped process and a bifurcation in the middle part. Furthermore, the anteromedial projection of the ventral rod has a small conspicuous filament in both anchors. Conclusions: With the description of this new species, eight species of Mymarothecium have been reported in fish of the Serrasalmidae family originating in the Amazon. © 2021 Elsevier B.V., All rights reserved.
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    Physicochemical and sensory changes of vacuum-packed, salt-ripened anchovy fillets (Engraulis ringens) stored at 8 and 20°C
    (Informa UK Limited, 2018-11-29) Rojas-De-Los-Santos, Estrellita; Valverde-Vera, Verónica; Del-Aguila-Moyano, Stephanie; Vela-Rosas, Jessica; Molleda-Ordoñez, Andrés; Ayala-Galdos, María; Albrecht-Ruiz, Miguel
    Anchovy (Engraulis ringens) fillets obtained from traditional salt-ripened for 8 weeks showed 26.9 mg/100g total volatile bases nitrogen (TVB-N), 2.9 mg/100g trimethylamine, 7.1, proteolytic activity index, 3.3% hydrolysis degree, 2.6 mg malonaldehyde/kg (TBA test) and 22.4 g KOH/100g total ester index. Water activity (Wa) values suggest osmotic equilibrium at 8th week (0.743±0.007). Physicochemical changes when fillets were vacuum-packed and stored for 14 weeks at 8°C/20°C were 32.4 / 75.7 TVB-N; 3.3 / 4.2 mg trimethylamine /100g;  9.8 /13.2 proteolytic activity index; 4.2 / 7.4% hydrolysis degree; 17.9/6.5 mg malonaldehyde/kg; and 20.1 / 21.7 total ester index respectively. Sensory scores corresponded to attractive reddish color and soft pleasant aroma of the product until 18th week at both temperatures, at the end of the study unpleasant odors corresponding to non-typical ripened fish (particularly in samples stored at 20°C) affected adversely the acceptability of the product for human consumption. © 2021 Elsevier B.V., All rights reserved.