Marcos Paiva Scardua
@ifce.edu.br
IFCE-Aracati, Brazil
IFCE-Aracati
RESEARCH, TEACHING, or OTHER INTERESTS
Agricultural and Biological Sciences, Animal Science and Zoology, Oceanography, Environmental Science
Scopus Publications
Scopus Publications
Barbara Libanio da Cruz, Marcos Paiva Scardua, Rebeca Maria Sousa, Mayara Schueroff Siqueira, Heriberto Gimênes Junior, Henrique Momo Ziemniczak, Alzira Gabriela da Silva Pause, Paulo Henrique Braz, and Claucia Aparecida Honorato
Medicina Veterinaria (UFRPE)
O objetivo deste estudo foi avaliar a inclusão do extrato hidroalcoólico de rosela (Hibiscus sabdariffa) em dietas do peixe Mato Grosso (Hyphessobrycon eques). Foram utilizados 120 peixes (0,51± 0,06 g), que foram distribuídos aleatoriamente em 12 aquários de polietileno de 20L, em sistema de recirculação de água, com a densidade de estocagem de 10 peixes por aquário. Os peixes foram alimentados por 21 dias com uma dieta (40,88% PB e 4374,8 Kcal kg-1), acrescida de extrato hidroalcoólico de rosela - EHR (controle; 0,12; 0,25 e 0,50 mg de EHR/kg de ração). A inclusão de concentração de 0,25 e 0,50 EHR/kg, promoveu uma melhora nos índices zootécnicos, comprimento padrão e eficiência alimentar. Os peixes apresentaram alteração de croma a*(tonalidades de verde e vermelho), entretanto, não houve aumento de intensidade em relação à luminosidade croma b* (tonalidades de azul e amarelo). A utilização de 0,25 e 0,50 EHR/kg refletiu em diminuição da atividade das enzimas AST e ALT. Observou-se o aumento da atividade catalase em concentrações com maiores índices de extratos hidroalcoólicos de rosela na dieta. O extrato hidroalcoólico de rosela é eficiente na alimentação de peixe Mato Grosso na concentração de 0,50 mg EHR/kg.
Marcos Paiva Scardua, Rogério Tubino Vianna, Sâmia Sousa Duarte, Natanael Dantas Farias, Maria Luíza Dias Correia, Helen Taynara Araújo dos Santos, and Patricia Mirella da Silva
FapUNIFESP (SciELO)
Abstract Crassostrea rhizophorae and C. gasar oysters are cultivated in the northeast region. Perkinsus parasites infect bivalves, and their effects on oysters from tropical regions are poorly understood. This study evaluated the impact of Perkinsus infection on the productive traits of native oysters. Oysters were sampled bimonthly during 7 months, from July 2010 to February 2011, to evaluate growth rate, mortality and shell color patterns (white and dark-gray) (n = 500), and to determine the prevalence and intensity of Perkinsus (n = 152). Perkinsus and Crassostrea species were determined using molecular tools. Results showed that most dark-gray (90%, n = 20) and white (67%, n = 18) oysters were C. gasar and C. rhizophorae, respectively. Oysters showed a high growth rate and moderate cumulative mortality (44%). C. gasar oysters grew better and showed lower mortality and lower incidence of Perkinsus compared to C. rhizophorae. The mean prevalence of Perkinsus was moderate (48%), but the infection intensity was light (2.2). Perkinsosis affected very small oysters (19.4 mm). In conclusion, native oysters, especially C. gasar, have a great potential for culture, mortality is not associated with perkinsosis, and the shell color of oysters can be used to improve selection for spats with better performance.
Patricia Mirella Da Silva, Marcos Paiva Scardua, Cairé Barreto Vieira, Analee Cruz Alves, and Christopher F. Dungan
National Shellfisheries Association
ABSTRACT The production of native oysters Crassostrea rhizophorae and Crassostrea gasar is expanding in northeastern Brazil, where reports of bivalve pathology are scarce. Recently, Perkinsus marinus was detected for the first time infecting C. rhizophorae in the state of Paraíba, in northeastern Brazil. Thus, more information on factors affecting the health of oysters is needed, especially concerning the pathogens listed by the World Organisation for Animal Health (OIE). The current study evaluated the health status of wild and cultured C. gasar mangrove oysters from the estuary of the Rio São Francisco, Sergipe state, northeastern Brazil. Results show that C. gasar oysters cultivated in the Rio São Francisco estuary had a greater prevalence of diseases and pathogens than oysters from a natural population in the same estuary, including maladie du pied (shell disease), Rickettsia—like organisms in gills, Steinhausia sp. oocyte infections, and Polydora sp. valve infestations. Of the two OIE notifiable diseases investigated, perkinsosis occurred at variable levels of prevalence that were always greater among cultured oysters (50.8%) than wild oysters (25.8%), and the intensity was predominantly low, suggesting low mortality impact. Bonamiosis was not detected.
Patricia Mirella da Silva, Marcos Paiva Scardua, Rogério Tubino Vianna, Raoani Cruz Mendonça, Cairé Barreto Vieira, Christopher F. Dungan, Gail P. Scott, and Kimberly S. Reece
Elsevier BV
Eduardo Suárez-Morales, Marcos Paiva Scardua, and Patricia Mirella da Silva
Cambridge University Press (CUP)
During a parasitological survey of the brown mussel Perna perna from highly productive culture fields in the southern sector of Brazil, monstrilloid copepods were discovered in the mantle of this mytilid bivalve. Numerous specimens of endoparasitic copepods were found within nodules in the mantle of the host; they belong to an undetermined species of Monstrilla. Monstrilloid copepods were known to be endoparasitic in polychaetes and in one species of prosobranch mollusc only; their occurrence as parasites of bivalve molluscs has not been previously documented. This is also the first record of these crustaceans infecting commercial molluscs. The prevalence of Monstrilla sp. infecting the brown mussel was 25.6%. At the histological level, it was observed that the larvae induced a strong haemocytic infiltration resulting from the complete larval encapsulation within the host mantle. The effect of this monstrilloid in the cultured populations of P. perna deserves further study.
Ronaldo O. Cavalli, Marcos P. Scardua, and Wilson Wasielesky
Wiley
The present study analyzes the reproductive performance of three size classes of wild (average weight of 46.5, 55.0, and 63.2 g) and three size classes of pond-reared (18.4, 21.3, and 25.1 g) Penaeus paulensis females. Unilaterally eyestalk ablated females were placed for 70 d in 3.6 m diameter tanks at 6 individuals/m2 and a 1.2:1 female-male ratio. Number of spawns, eggs, nauplii, fertilization and hatching rates were recorded every second day. The length of unfed protozoea I larvae was also recorded. Larger broodstock shrimp tended to suffer higher mortality rates. Smaller, pond-reared females started spawning at 28.2 ± 4.1 g. The number of eggs and nauplii per spawning event were not significantly different between experimental groups (P > 0.05), but due to their higher spawning frequency, small wild females (46.5 ± 3.7 g) outperformed medium (55.0 ± 1.8 g) and large ones (63.2 ± 7.0 g). No relationship between protozoea length and spawner size was found. Optimum size for the maturation of wild P. paulensis females was estimated to be from 30 to 60 g. It is suggested that the use of this size range can potentially enhance nauplii production of P. paulensis.