Browsing by Author "Cala-Delgado, Daniel Leonardo"

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Molecular identification of Mymarothecium viatorum and Anacanthorus penilabiatus in extensive native fish farming systems of the Peruvian Amazon
(Elsevier BV, 2024-09) Cabrera-Soregui, Milagros; Torres-Lozano, Karel Gelina; García-Candela, Jose Luis Enrique; Mesias-Valle, Fernando Daniel; Martínez-Rojas, Rosa; Cruz-Neyra, Lidia; Mondragón-Martínez, Aarón Maguín; Bertholdi-Ebert, Mariana; Da-Silva, Reinaldo José; Cala-Delgado, Daniel Leonardo
Piaractus brachypomus (Pacú) is the main native fish species cultivated in Peru and holds great potential for growth in aquaculture from the Peruvian Amazon. Between October 2021 and January 2022 in two fish producing farms in the Amazon region of San Martín in Peru, P. brachypomus individuals were examined for parasite evaluation. A total of 6366 monogeneans were isolated from the gills of 30 fish, revealing a prevalence of 100%, with an abundance and mean intensity of 212 parasites per fish. Monogeneans were morphologically identified as Mymarothecium viatorum and Anacanthorus penilabiatus. The genetic divergence in the 28S rDNA gene found among A. penilabiatus sequences was 0.1% and among Anacanthorus spp. it ranged from 0.9% to 7.5%. The genetic divergence found among the M. viatorum sequences was 0.3%. These finding represents the first molecular data of M. viatorum and A. penilabiatus in Peru using the 28S rDNA gene of these monogeneans. The new sequences obtained will contribute to future studies on the phylogenetic relationships among dactylogyrids. However, further research with a broader range of host-parasite samples and additional genetic markers is needed to clarify these relationships and provide stronger support for the phylogenetic positions. © 2024 Elsevier B. V., All rights reserved.
Socioeconomic impact of COVID-19 on Peruvian amazon aquaculture: a survey to fish farmers of the San Martín region
(ITP red CITE, 2021-10-05) García-Candela, Jose Luis Enrique; Sanchez-Sanchez, Vanessa; Cala-Delgado, Daniel Leonardo
The pandemic produced by COVID-19, is affecting all sectors worldwide. Aquaculture and fishing are not the exception. The measures taken by governments in order to dissipate contagions prevent supporting the economy. Faced with this situation, governments and state entities are taking measures to cushion and strengthen companies. However, to make correct decisions regarding aid, it is necessary to diagnose the state of the productive sectors in order to carry out interventions and manage solutions to priority problems. The objective of the present study was to establish information on the aquaculture production units in the San Martín region, which enables the aquaculture sector to be managed efficiently, promoting efforts and public interventions in the region. The results show that more than 90% of the aquaculture producers in the San Martín region are affected, mainly by logistical difficulties in the delivery of supplies, which have stopped the operation of approximately 18% of fish production. During the COVID-19 dormancy period, aquaculturists implemented some biosecurity measures, mainly handwashing, but it is necessary to establish protocols for good aquaculture production practices to strengthen health aspects that prevent the spread of the disease.