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
Arantes,F.P.; Santos,H.B.; Rizzo,E.; Sato,Y.; Bazzoli,N., 2010: 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.
||PDF Full Text: Upload
Submit PDF Full Text of Accession 035564420
No spam - Every submission is manually reviewed
Select a file (≤5MB):
The influence of gamma-irradiation and photoperiod on auxin levels and growth of the strawberry plant: Sparkle strawberry plants were given 0, 100, 500 and 1000r per day of gamma-irradiation for 42 days and then subjected to various numbers of short-day inductive cycles. Following short-day treatments, methanol extracts of the plant crowns were chr...
Retinal progenitor cell xenografts to the pig retina Immunological reactions: We evaluated the host response to murine retinal progenitor cells (RPCs) following transplantation to the subretinal space (SRS) of the pig. RPCs from GFP mice were transplanted subretinally in 18 nonimmunosuppressed normal or laser-treated pigs....
Adaptations to terrestrial environments
Solving the Campylobacter mystery
Responses of large volcanic eruptions in the instrumental and documentary climatic data over Central Europe: Responses of large volcanic eruptions in selected long temperature series from Austria, the Czech Republic and Germany as well as in three global radiation series in Central Europe are studied. In the example of seven large tropical eruptions (Kra...
Repercussions de l'inoculation de toxoplasme a des rattes gestantes
Chloroplast development in the chrysophyte, Ochromonas danica
Dry matter production and nutritional status of passion fruit under different ESP levels: Seedlings of passion fruit (Passiflora edulis Sims) were grown in naturally sodic (41.0 ESP) and artificially sodic for (12 to 60 ESP) soils for 12 months under pot study at Marathwada Agricultural University, Parbhani during 1987-88. A 50 per cen...
Zahndurchbruch und Zahnwechsel beim Elbebiber, Castor fiber albicus
Shifting cultivation: A discussion and papers by 7 authors on the use of the system in various parts of the world. From For. Abstr.
The dynamics of Papilionoidea in the central steppe of Dnepr region.
Spatio-temporal expression patterns of eight epidermis-specific genes in the Ascidian embryo: During embryogenesis of the ascidian Halocynthia roretzi, exactly eight-hundred epidermal cells are formed in the larva, and the lineage of the cells has been almost completely described. In the present study, we examined the spatio-temporal expre...
A new antifungal antibiotic, mycostatin (nystatin), ior the treatment of moniliasis: a preliminary report: Of eight patients with Candida albicans infections of various types treated with mycostatin at the Columbia University College of Physicians and Surgeons, Missouri, the symptoms of six cleared completely, while the other two, one a case of vagmiti...
Regulation of cellular immediate early genes by typical and atypical antipsychotic drugs
Characterization of thyroglobulin and thyroid transcription factor-1 in the bullfrog, Rana catesbeiana