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| | 1. |
2009 Nov |
Socio-economic characteristics of the Cachoeira de Emas small-scale fishery in Mogi-Guaçu River, State of São Paulo, Brazil.
Peixer J, Petrere Júnior M
Braz J Biol. 2009 Nov;69(4):1047-58.
Abstract
Fishing in the area of Cachoeira de Emas dates from the aboriginal Painguás who inhabited its margins. The socioeconomic conditions of the fishers and fishing are described, derived from personal interviews with 33 fishers. Their mean age is 48.6 years and they have been fishing on average for 24.2 years. The monthly total raw income is US$ 575.52 and the raw income just from fishing is of US$ 239.64 per fisher. Most of them (66.6%) have only incomplete primary and junior education. The main capture species are curimba Prochilodus lineatus, piapara Leporinus obtusidens, dourado Salminus brasiliensis, mandi Pimelodus maculatus, Pimelodus heraldoi and lambari (genus Astyanax and Roeboides). Fishers capture an average of 19.9 kg of fish per day. The total average raw income just calculated from the interviews is very high when compared with other places in Brazil and in the world, and above the poverty line as defined by the Getúlio Vargas Foundation. So we may conclude there these fishers are not the poorest in society.
[Pubmed: 19967175]
| | 2. |
2009 |
Karyotypes of two species of the genus Pimelodus (Siluriformes, Pimelodidae).
Treco FR, Dias AL
Folia Biol. (Krakow). 2009;57(1-2):43-8.
Abstract
A cytogenetic study was conducted on two species of the genus Pimelodus that were collected from the Piquiri river, Paraná, Brazil: Pimelodus paranaensis and Pimelodus heraldoi. Both had a diploid number of 2n=56 chromosomes and a fundamental number (FN) of 104. In P. paranaensis, the karyotype consisted of 22m+22sm+4st+8a chromosomes, whereas the karyotype of P. heraldoi consisted of 18m+24sm+6st+8a. The AgNORs were localized in the terminal region of the long arm in one pair of subtelocentric chromosomes, pair 24 in P. paranaensis and pair 23 in P. heraldoi. The latter species showed size heteromorphism of these regions between the chromosome homologues. Heterochromatin was distributed mainly in the terminal regions in the two species. CMA3-positive staining was observed in some chromosomes, besides being associated with NORs, which were all DAPI-negative, in both species of Pimelodus. C-banding plus CMA3 and DAPI showed that most of the heterochromatic regions were rich in AT bases in P. paranaensis and P. heraldoi.
[Pubmed: 19459460]
| | 3. |
2004 |
Banding chromosome pattern of two species of Pimelodus (Siluriformes, Pimelodidae) from the Parana River basin of Brazil.
de Souza L, Giuliano-Caetano L, Dias AL
Folia Biol. (Krakow). 2004;52(3-4):165-9.
Abstract
Cytogenetic studies were carried out on seven specimens of Pimelodus heraldoi and sixteen specimens of Pimelodus sp., both from the Parana River basin. The two species had the same diploid number of 56 chromosomes: P. heraldoi with 22M+22SM+6ST+6A and FN of 106 and Pimelodus sp. with 24M+26SM+4ST+2A and FN of 110. NORs were found at the terminal position of the long arm of one pair of ST chromosomes. C-banding (CB) showed in the two species heterochromatin distributed in various chromosomes of the complement, mainly in telomeric regions and in a pair of metacentric chromosomes with strong heterochromatic staining in both telomeres. Treatment only with the fluorochrome CMA3 confirmed in Pimelodus heraldoi and Pimelodus sp. the nucleolar chromosome pair and showed other fluorescent bands. Combined treatment with CB+CMA3 enhanced fluorescent staining of chromosomes in the two fish species evidencing several bands, including in P. heraldoi a chromosome pair showing fluorescent staining in both telomeres.
[Pubmed: 19058555]
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