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| Author(s): |
Laíza Maria de Jesus Silva
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Ilha Solteira. 2016-05-06. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Engenharia. Ilha Solteira |
| Defense date: | 2016-03-04 |
| Advisor: | Rosicleire Veríssimo Silveira |
| Abstract | |
The antropogenic influence has grown continuously in the environment, thus negative impacts on the environment cause changes on the distribution and abundance of aquatic species extending from small streams to large rivers. In teleosts, gametogenesis is a highly complex process, modulated by environmental and physiological changes. This study aimed to evaluate the influence of three different temperatures on ovarian development of Devario aequipinnatus. They were used adult females specimens, and for the experiment were used three aquariums with a capacity of 9 L, kept at 18°C, 24°C and 30°C, the experiment was conducted with a temperature of each period. Five individuals from each treatment were collected randomly every four days in the period between 1st and 37th experimental day at temperatures of 24°C and 30°C and the period between 1st and 33th day at temperature of 18°C. The material were processed according to the usual techniques for light microscopy. In folliculogenesis, the oogonia, cells are the smallest of the germ line and go through different stages of meiotic prophase. In oogenesis, stages were classified into initial and final previtelogenic, initial and final vitellogenesis and maturation. Already reproductive phases were classified into Regenerating, initial and final Developing, Spawning Capable and Regressing. Thus, it was found that at 24°C (T24) of final Developing and Spawning capable phases were observed. However, in other temperatures, 18°C (T18) and 30°C (T30), the same pattern was not observed, all stages were identified as follows: Initial and Final Developing, Spawning capable, Regressing and Regenerating. So we can conclude that the temperature influenced the ovarian development pattern in Devario aequipinnatus. (AU) | |
| FAPESP's process: | 14/12584-0 - Reproductive cycle of female Devario aequipinnatus (Cypriniformes, Cyprinidae) exposed to different temperatures |
| Grantee: | Laíza Maria de Jesus Silva |
| Support Opportunities: | Scholarships in Brazil - Master |