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| Neuberger,Andréa L.; Marques,Elineide E.; Agostinho,Carlos S.; Oliveira,Rafael J. de. |
| In order to evaluate aspects of the reproductive biology of Rhaphiodon vulpinus in the Upper and Middle Tocantins River, samples were taken monthly from October, 1999 through September, 2001, by means of gill nets. Males, which were more abundant than females (chi2 146.87: df=1: p<0.05), matured at a smaller size. The reproductive period of the species extended essentially from November through January, with a peak of activity in November. Fecundity, with an estimated mean value of 98,185 oocytes, varied from 38,177 to 215,841 oocytes, and it did not correlate with the length of the individual female analyzed (r=0.4663: p=0.206). Relative fecundity was 130.6 oocytes/g total weight. Mature oocytes had a mean diameter of 0.98 mm, corresponding to a volume... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sex ratio; First maturation; Reproduction; Fecundity. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000400007 |
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| Lima,Jô de Farias; Silva,Luis Mauricio Abdon da; Silva,Thibério Carvalho da; Garcia,Jamile da Silva; Pereira,Ilana da Silva; Amaral,Karlia Dalla Santa. |
| Macrobrachium amazonicum is an indigenous prawn vastly distributed in basins of South America, widely exploited by artisanal fisheries in northern and northeastern Brazil and, with great potential for aquaculture. This study aimed to investigate general aspects of population structure and reproductive characteristics (size at first maturity, fecundity and reproductive output) of M. amazonicum from two important areas to artisanal prawn fishing located at the mouth of the Amazon River, State of Amapá. The specimens were captured using 20 handcrafted traps called "matapi". A number of 5,179 prawns were captured, 2,975 females and 2,195 males resulting in 1.35:1 female to male ratio. Santana Island and Mazagão Velho showed females predominated in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Palaemonid eggs; First maturation; Fecundity; Morphometric relationships; Reproduction. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000200010 |
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