Gonadosomatic Index
Mostrando 13-24 de 37 artigos, teses e dissertações.
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13. Annual male reproductive activity and stages of the seminiferous epithelium cycle of the large fruit-eating Artibeus lituratus (Chiroptera: Phyllostomidae)
The large fruit-eating phyllostomid bat, Artibeus lituratus (Olfers, 1818), forearm 69-75 mm, body mass 66-82 g, has a diversified geographic distribution in the Neotropical region. Therefore it is subjected to different climatic conditions that affect its reproduction, leading to different reproductive strategies such as continuous reproduction, seasonal mo
Zoologia (Curitiba). Publicado em: 2015-06
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14. Reproductive biology of Cetengraulis edentulus (Cuvier, 1829), the major fishery resource in Guanabara Bay, Brazil
Cetengraulis edentulus is a broadely distributed engraulid in Southwest Atlantic, currently accounting for the main fish species commercially exploited at Guanabara Bay, Brazil. This study aimed to extend the knowledge on reproduction of C. edentulus at Guanabara Bay and to test whether some descriptors of reproductive activity, especially the gonadosomatic
Neotrop. ichthyol.. Publicado em: 02/12/2014
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15. Testicular Histomorphometric Evaluation of Zebu Bull Breeds
The objective of this study was to evaluate the quantitative histology and testicular biometrics in zebu bulls of different breeds. Testicular fragments of Nelore (n=10), Polled Nelore (n=6), Gir (n=5), Guzerat (n=5) and Tabapuã bulls (n=5) were used. The fragments were perfusion-fixed in Karnovsky solution, embedded in glycol methacrylate and stained with
Braz. arch. biol. technol.. Publicado em: 2014-12
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16. Efeitos do inseticida endossulfam sobre a morfologia e a morfometria testicular em morcegos frugívoros Artibeus lituratus (OLFERS, 1818) / Effects of the endosulfan on the testicular morphology and morphometry in fruit bats Artibeus lituratus (OLFERS, 1818)
Large amounts of agricultural chemicals are discharged into the environment in Brazil. These pesticides are often used to destroy or impair the activity of organisms that attack crops. There are some reports in the literature concerning the decline of many wildlife populations as a result of contamination of their habitats by pesticides. One of the putative
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/02/2012
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17. Reproductive biology of Sciades herzbergii (Siluriformes: Ariidae) in a tropical estuary in Brazil
The present study investigated the reproductive biology of Sciades herzbergii in the Paraíba do Norte River Estuary, Brazil. We aimed to characterize the reproduction of the species with respect to sex ratio, spawning season, condition factor and length at first maturity. Specimens were captured between August 2009 and July 2010 in a stretch of the main cha
Zoologia (Curitiba). Publicado em: 2012-10
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18. The reproductive biology of the plata pompano, Trachinotus marginatus (Teleostei: Carangidae), in southern Brazil
The Plata pompano, Trachinotus marginatus (Cuvier, 1832), is an endemic carangid of the Southwestern Atlantic Ocean, occurring from Rio de Janeiro to Uruguay. This study describes the reproductive period, spawning type, the size at first gonadal maturation and the length-weight relationship of individuals sampled from landings of the artisanal and commercial
Zoologia (Curitiba). Publicado em: 2011-10
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19. Interrelationships among egg, larvae and maternal characteristics in Persian sturgeon Acipenser persicus
This study was aimed to observe the correlations among egg, larvae and maternal characteristics of Persian sturgeon. A total of 41 females were used and the variables including fertilization rate, incubation survival rate, larvae survival rate during yolk sac absorption (before feeding), and larvae survival rate after first feeding were determined. As a resu
Brazilian Archives of Biology and Technology. Publicado em: 2010-10
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20. Reproductive biology of the mullet Mugil liza (Teleostei: Mugilidae) in a tropical Brazilian bay
The reproductive biology of Mugil liza Valenciennes, 1836 is described as a contribution to an elaborate management programm. A total of 243 specimens (89 males and 154 females) were collected in the Sepetiba Bay in south-eastern Brazil from July/2006 to June/2007. The gonadosomatic index (I G) and the sequential development of the ovaries observed through h
Zoologia (Curitiba). Publicado em: 2010-06
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21. Reproductive biology in the starfish Echinaster (Othilia) guyanensis (Echinodermata: Asteroidea) in southeastern Brazil
Echinaster (Othilia) guyanensis Clark, 1987 is an endangered starfish distributed throughout the Caribbean and Atlantic Ocean. Even though it has been extensively harvested, little is known about the biology and ecology of this starfish. Here, we examine reproduction seasonality in E. (O.) guyanensis. Individuals were collected monthly for one year, includin
Zoologia (Curitiba). Publicado em: 2010
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22. Biologia reprodutiva da baúna de fogo Lutjanus alexandrei (Moura &Lindeman, 2007) capturada na costa Norte do Estado de Pernambuco
The study presents information about the reproductive characteristics of baúna de fogo Lutjanus alexandrei. Ware obtained 540 samples of this species in north coast of Pernambuco state from 2004 to 2006. Ware realized 250 (150 females and 100 males) histological cuts and observations of the presents oocytes and spermatogonias, analyzed with microscopy to de
Publicado em: 2010
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23. Reproductive biology and development of sexually dimorphic structures in Aphyocharax anisitsi (Ostariophysi : Characidae)
O período reprodutivo de Aphyocharax anisitsi é descrito através da análise de espécimes coletados mensalmente entre abril de 2001 e março de 2002 no arroio do Salso (30°22’27"S, 55°02’06"W) em Rosário do Sul, Rio Grande do Sul, Brasil. A variação mensal das médias do IGS (Índice Gonadossomático) de machos e fêmeas mostrou um período repr
Publicado em: 2010
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24. Biologia reprodutiva da |Tainha, Mugil curema valencientes, 1836 (osteichthyes: mugilidade) nas águas costeiras do Rio Grande do Norte
O peixe marinho tainha, Mugil curema Valenciennes, 1836 (Osteichthyes:Mugilidae) apresenta ampla distribuição geográfica, sendo comum na costa brasileira e de grande importância para a pesca artesanal. Este trabalho teve como objetivo determinar a biologia reprodutiva de M. curema nas águas costeiras do Estado de Rio Grande do Norte. Foram capturados me
Publicado em: 2010