Navegando por Assunto "Piramutaba"

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Acesso aberto (Open Access)
Determinação da idade e crescimento da piramutaba Brachyplatystoma vaillantii (Valenciennes, 1840) (Siluriformes : Pimelodidae) capturada no Estuário amazônico
(Universidade Federal do Pará, 2001-05-31) PIRKER, Lilianne Esther Mergulhão; BARTHEM, Ronaldo Borges; http://lattes.cnpq.br/4192105831997326
The specimens of piramutaba (Brachyplatystoma vaillantii) analyzed in this research were obtained from experimental fisheries in the amazon estuary. For the study of age determination pectorals and dorsal spines, opercules, otoliths (lapillus) and vertebrae were analyzed. From the analysis of these structures it was concluded that the vertebrae is the most appropriate bony structure for the age determination of piramutaba. This is so because the vertebrae showed good resolution in annulus (59%), and it also has a significant exponential relationship (r² = 0,9889 and P<0,05) between the radius of the vertebrae and the fork length of fish. The seasonal rings were validated using length frequency analysis. Two annual rings are formed on the vertebrae of piramutaba. The weight-length relationship seen in piramutaba describes its growth as allometric and the equation that describes its growth is: Wt = 6,1 * 10-6 * Lf3,1129. The sexual proportion of piramutaba observed was not 1:1, as the number of females was superior to the males. On vertebraes of piramutaba a maximum of ten rings were observed. The von Bertalanffy growth model was utilized in this research to estimate the length and weight equations. The growth parameters (k, t0 e L∞) were estimated through four different methods: rings reading, backcalculation, rings modal progression and length frequency analysis. The growth parameters were k = 0,138 ano-1, t0 = -0,239 e L∞ = 110,5 cm (tings xeaffing); k = 0,119 ano-1, t0 = -0,202 e L∞ = 110,5 cm (backcakulation); k = 0,096 ano-1, t0 = -0,146 e L∞ = 110,5 cm (rings modal progression) and k = 0,127 ano-1, t0 = -0,236 e L∞ = 110,5 cm (length frequency analys is).
Acesso aberto (Open Access)
Microbiological and physicochemical characterization of surimi obtained from waste of piramutaba fillet
(2012-06) GALVÃO, Giane Célia dos Santos; LOURENÇO, Lúcia de Fátima Henriques; RIBEIRO, Suezilde da Conceição Amaral; RIBEIRO, Carmelita de Fátima Amaral; PARK, Kil Jin; ARAUJO, Eder Augusto Furtado
The aim of this work was to perform the microbiological and physicochemical characterization of surimi made from waste of piramutaba filleting. The results of physicochemical characterization of the waste and surimi were: moisture (76.37 and 79.11%), total lipids (5.35 and 0.74%), proteins (14.92 and 10.79%), ash (3.03 and 2.35%), pH (6.9 and 7.4), caloric value (109.15 and 77.86 kcal.g-1), and water activity (both 0.98), respectively. The results of the levels of total volatile bases were 7.29 mgN/100-1 g (waste) and 7.01% carbohydrate (surimi). The values of total lipids and proteins were reduced during the preparation of surimi, probably due to successive washes during the processing. Waste and surimi were examined microbiologically and are in compliance with required parameters. The results show a loss of red (a* parameter) and yellow (b* parameter) color. On the other hand, the L* parameter (lightness) increased after the processing of surimi. It can be concluded that piramutaba waste can be used for surimi preparation and as a source of nutrients for human consumption, providing an alternative use of these wastes avoiding their disposal polluting the environment.
Acesso aberto (Open Access)
Morfometria e descrição de otólitos de dourada (Brachyplatystoma rosseauxii) (Castelnau, 1855) e de piramutaba (B. vaillantii) (Valenciennes, 1840) (Siluriformes: pimelodidae) e verificação de anéis de crescimento em otólitos de juvenis de dourada e de piramutaba na Ilha de Colares - Baía de Marajó-PA
(Universidade Federal do Pará, 2008-10-09) PIRKER, Lilianne Esther Mergulhão; BARTHEM, Ronaldo Borges; http://lattes.cnpq.br/4192105831997326
The dourada (Brachyplatystoma rousseauxii) and the piramutaba (B. vaillantii), two migratory freshwater catfishes, are exploited by both traditional and industrial fishery in the Amazonian. They are very important for the commercial fishery in this region and their stocks are currently sobrexploted. However there is a lack of information concerning the biology and ecology of juvenile stages of these catfishes in the scientific literature. In population dynamics studies, the correct age estimate influences the growth parameters, which are important to evaluate stocks. The studies of age determination are usually made using sub-adults and adults specimens. The juveniles are not analyzed and their age is back-calculated. Which could result in an error estimate. The aims of the present research were: (1) to describe and estimate the relation between the lapilli otoliths morfometric measurements and the body measurements of dourada and piramutaba, and (2) to examine the occurrence of the first growth rings in the juvenile specimens. The morfometric and descriptive studies were carried out using otoliths from dourada and piramutaba juveniles, sub-adults and adults collected in the municipalities of Colares (PA), Almeirim (PA), Santarém (PA), and Manaus (AM), in the District of Mosqueiro (PA), and in the Amazon estuary. The period of collection was different for each local, to September of 1996 to January of 2006. The following relations were estimated: furcal length from specimens (LF) x total weight from specimens (WT); LF x maximum otolith length (MOL); LF x maximum otolith width (MOW); LF x otolith total weight (OWT); WT x MOL; WT x MOW and WT x OWT. The estimated equations were: Dourada: WT = 9.5 x 10-6 x LF 3.0279, LF = 25.259 * MOL1.1571, LF = 40.626 * MOW1.2127, LF = 840.419 * OWT0.4077, WT = 0.125 * MOL3.6547, WT = 0.568 * MOW3.8294, WT = 7549.98 * OWT1.2651; Piramutaba: WT = xxx 5.4 x 10-6 x LF 3.1441, LF = 31.871 * MOL1.3381, LF = 55.852 * MOW1.3722, LF = 1641.064 * OWT0.4686, WT = 0.3127 * MOL4.1857, WT = 1.823 * MOW4.2788, WT = 66675.977 * OWT1.4508. In the descriptive study, the lapilli of dourada and piramutaba were classified in the following categories according to their development and specimens LF: dourada I (60 a 80 mm), dourada II (80 a 110 mm), dourada III (110 a 210 mm), piramutaba I (65 a 80 mm), piramutaba II (80 a 110 mm), and piramutaba III (110 a 190 mm). In the lapillus ring reading study, only the juveniles specimens £ 200 mm LF were used. In the Marajó bay, douradas and piramutabas with 175.03 mm and 171.03 mm mean LF, respectively, showed the first growth ring. Both species were between nine and twelve months old when they showed the first growth ring. The mean rays of the first hyaline ring in the transversal cut of dourada’s and piramutaba’s lapillus were 0.36 mm (± 0.03) and 0.33 mm (± 0.01), respectively. The mean total ray of the lapillus transversal cut was 0.64 mm (± 0.14) in dourada and 0.53 mm (± 0.09) in piramutaba. The estimated equation relating the total ray of the lapillus transversal cut of douradas juveniles with its LF was LF = 248.589 * Rt1.1901. The estimated equation for piramutaba was LF = 400.494 * Rt1.7178. Douradas and piramutabas 60-70 mm LF were three to six months old, 70-110 mm LF were six to nine months old, and 110-200 mm LF were nine to twelve months old.