EurekaMag.com logo
+ Main Category
Research: 36,903,181
+ Most Shared Content


EurekaMag.com's Most Shared Content

+ Follow Us

EurekaMag.comon Google+

+ Latest Full Text Content


EurekaMag.com PDF full text articles

Profiles of sex steroids, fecundity, and spawning of the curimata-pacu Prochilodus argenteus in the Sao Francisco River, downstream from the Tres Marias Dam, Southeastern Brazil




, : Profiles of sex steroids, fecundity, and spawning of the curimata-pacu Prochilodus argenteus in the Sao Francisco River, downstream from the Tres Marias Dam, Southeastern Brazil. Animal Reproduction Science8: 2 4, 330-336

The present study evaluated for the first time sex steroid profiles and fecundity in females of Prochilodus argenteus from two sections of the Sao Francisco River Brazil, downstream from the Tres Marias Dam, which influences characteristics of their water habitat. The model species in the study, P. argenteus, is an important commercial and recreational species in Brazil. In the region closest to the dam (section 1), females did not reach final oocyte maturation, failed to spawn, and displayed lesser circulating concentrations of testosterone, 17(-hydroxyprogesterone (17(-P)) and 17 beta -estradiol (E2)) than those farther downstream of the dam (section 2). The endocrine and fecundity deficiencies probably are attributed to lower water temperature and oxygen concentration in (section 1). The follicular atresia rate in the region closest to the dam (26%) was greater than those fish captured farther downstream of the dam (13%), after the Abaete River (section 2). Variations in testosterone, E2 and 17(-P) concentrations in section 2, followed gonadal maturation which are typical features of species which have seasonal reproduction, group-synchronous oocyte development, and are single batch spawners such as P. argenteus. Results document the first evidence of endocrine and reproductive dysfunctions caused by inadequate water conditions in a wild population of the migratory species P. argenteus in the Sao Francisco River, downstream from the Tres Marias dam.

Accession: 035564420 PDF Full Text: Upload

Submit PDF Full Text of Accession 035564420

No spam - Every submission is manually reviewed

Select a file (≤5MB):

Close Close

Related Research

Mercury in the Moji-Guacu river basin, SP-Brazil The link between marginal lagoons and river contribution, assessed by 210Pb dating profiles: Total mercury content was evaluated in water and suspended sediment samples of the Moji-Guacu river and in water and bottom sediment of its 3 margi...

Heavy metals in vertical profiles of the middle Odra River overbank sediments Evidence for pollution changes: Heavy metal concentrations were investigated in the overbank sediments in the middle reach of the regulated Odra River, in south-west Poland. Sampl...

Hepatitis B and C in the hemodialysis unit of Tocantins, Brazil Serological and molecular profiles: A survey was conducted in the hemodialysis population of the state of Tocantins, Brazil, aiming to assess the prevalence of hepatitis B virus (HBV)...

Infant morbid-mortality profiles in the state of Sao Paulo, 1994, Brazil

Methamphetamine-related deaths in San Francisco Demographic, pathologic, and toxicologic profiles: A study was undertaken to develop demographic, toxicologic, and pathological profiles of methamphetamine-related deaths. Anatomic and toxicologic f...

Microbial transformations of steroids-XII Progesterone hydroxylation profiles are modulated by post-translational modification of an electron transfer protein in Streptomyces roseochromogenes: When Streptomyces roseochromogenes strain 10984 was incubated with exogenous progesterone for 25 h the major monohydroxylated metabolite, 16alpha-h...

Neuroactive steroids, their precursors and polar conjugates during parturition and postpartum in maternal blood 2 Time profiles of pregnanolone isomers: Time profiles of the pregnanolone isomers epipregnanolone (3beta-hydroxy-5beta-pregnan-20-one), allopregnanolone (3alpha-hydroxy-5alpha-pregnan-20-...

Photoperiod regulates the timing of sexual maturation, spawning, sex steroid and thyroid hormone profiles in the Atlantic cod: Atlantic cod of both sexes were held under four different photoperiod regimes from age 1 year until second sexual maturation at 3 years. Annual pho...

Polychlorinated dibenzo-p-dioxins and dibenzofurans Their concentrations and profiles in sediments in the Tama River, Japan: Surface sediments were collected from eight sampling points, representing upper, mid- and downstream regions, of the Tama River, to obtain backgrou...

Radial profiles of sap flux density in four southeastern pine species

Rattlesnake species with contrasting breeding systems show differences in seasonal profiles of sex steroids

Spatial comparison of sedimentary fatty acid profiles in the coastal mid-Atlantic Potomac River basin

Spatial profiles of hsp70 proteins in Asian clam in northern San Francisco Bay may be linked to natural rather than anthropogenic stressors: Multi-year investigations in northern San Francisco Bay by United States Geological Survey have linked reduced condition indices in populations of...

Substrate utilization profiles of bacterial strains in plankton from the river warnow, a humic and eutrophic river in North Germany: Bacteria are very important degraders of organic substances in aquatic environments. Despite their influential role in the carbon (and many other e...

Tuberculosis in Sao Paulo, Brazil Genetic and resistant profiles: Background: Sao Paulo city notifies annually 7,000 tuberculosis cases among 19,000 TB cases reported from S. Paulo State. This community-based stud...