Navegando por Assunto "Betta splendens"

Agora exibindo 1 - 3 de 3

Acesso aberto (Open Access)
Dissociação entre observação e interação na modificação do display agressivo do Betta splendens
(Universidade Federal do Pará, 2011) CUNHA NETO, João Soares da; GOUVEIA JUNIOR, Amauri; http://lattes.cnpq.br/1417327467050274
The observation of fight (i.e., the presence of an anonymous observer of a fight) is something that changes the parameters of the fighting display of Betta splendens. The aim of this study was to identify whether and how observation alone or associated with the interaction modifies the emission of the display. Male Betta splendens were used (N = 28) in a battery of experiments to identify whether the aggressive display is modified either by the observation of a conspecific in a situation of confrontation (Experiment I) or by the observation of a conspecific in a situation of confrontation and subsequent exposure to this very conspecific (Experiment II). There was no statistical difference in the data obtained from the Experiment I, however, with respect to the data obtained in the Experiment II we could identify a statistically significant difference (F (1.6) = 6.002, p = 0.05) reflected in an increased latency of the Horizontal Display. We concluded that in Experiment I the behaviors were stable, and that the observation associated with interaction (Experiment II) is able to modify the emission of the aggressive display of Betta splendens.
Acesso aberto (Open Access)
Efeitos de choques incontroláveis sobre comportamento agressivo do peixe de briga do Sião (Betta splendens)
(Universidade Federal do Pará, 2013-10-29) CARVALHO, Paula Danielle Palheta; CARVALHO NETO, Marcus Bentes de; http://lattes.cnpq.br/7613198431695463
The previous exposure to uncontrollable aversive events may produce not only difficulty in learning new responses, widely reported in studies of learned helplessness, but may also affect unlearned behavior such as aggressive behavior. The aim of this study was to verify the effects of uncontrollable shocks on the aggressive behavior of Siamese fighting fish (Betta splendens). It was utilized 18 domesticated Betta splendens divided into three groups with 6 animals each, a group that did not receive shocks (Control – CTRL), one that received Controllable Shocks (CHC group) and one that received uncontrollable shocks (CHI group). The apparatus used were an aquarium proper to the observation of aggressive behavior and a shuttlebox for the shock treatment. The procedure was performed in three phases: in the first phase, the aggressive behavior of the animal was registered (baseline) for 5 minutes after 10 minutes of habituation. In the second phase, the animals of the CHC group received 3 controllable shocks of approximately 0.6V with maximum duration of 30s each if the animal did not issue an escape response that consisted in crossing to the opposite side of apparatus, which ceased the shocks; all the animals escaped in three attempts. The animals of the CHI group, in the second phase, received the same amount and duration of shocks that received its equivalent in the CHC group. In the third phase, the test was carried out and the aggressive behavior was registered again, similarly to the baseline. The interval between phases was of 24h approximately. The components of aggressive behavior registered were: display; attack; emerging; resting. These behaviors were measured regarding the latency of the first response, response frequency and duration. Statistical analysis were performed between groups and intragroup; the analysis between groups did not show statistically significant differences, and the intragroup analysis showed significant difference only regarding the latency of the first display response in the test [H(1) = 4.078, p = 0.041] in the CHI group, thought this response decreased in all group. Therefore, this reduction cannot be attributable to the treatment with uncontrollable shocks. Thus, since there were no statistically significant differences between groups nor intragroup for the responses measured, neither before nor after the exposure to uncontrollable shocks, it can be said that, taking into account the experimental conditions of this study, the uncontrollable shocks do not attenuate the aggressive behavior of Betta splendens similarly to what happens with rats and mice when they are exposed to situation of uncontrollability with electric shocks.
Acesso aberto (Open Access)
Fotoperíodo e frequência alimentar na larvicultura do peixe beta
(FEPMVZ Editora, 2016-08) SALES, Abner Dias; VERAS, Galileu Crovatto; BRABO, Marcos Ferreira; ABRUNHOSA, Fernando Araujo; ALVES, Adriana Xavier; DIAS, Bruno César Brito; CAMPELO, Daniel Abreu Vasconcelos; FERREIRA, M.S.S.
The aim of this study was to evaluate the growth, uniformity and survival of Betta splendens larvae, submitted to different photoperiods and feeding frequency. Four hundred and eighty individuals (4.53mg ± 0.32 and 5.51 ± 0.58mm) were randomly distributed into 48 plastic containers (1L) at a density of 10 larvae/L. A completely randomized design was used, with four replications in a factorial 6 x 2, six photoperiods (0L:24D, 6L:18D, 12L:12D, 16L:8D, 20L:4D, 24L:0D) and two feeding frequencies (two or four times a day). The larvae were fed performed with Artemia nauplii at averaging 800/ larvae/ day, for 15 days. Beta larvae subjected to photoperiod 12L:12D and 16L:8E showed the greatest weight gain (P<0.10), while those fed four times daily had greater length growth and uniformity (P<0.10). However, individuals fed four times daily had lower survival when subjected to photoperiod 16L:8E, 20L:4L and 24E:0D (P<0.10). On the other hand, larvae subjected to a photoperiod of 12L:12D, 16L:8L and 20L:4E showed higher survival rate when fed twice a day (P<0.10). Therefore, with the intention of better growth, uniformity and survival of Betta splendens larvae, it is recommended that the hatchery in this species be done under a photoperiod of 12L: 12D with supply of Artemia nauplii twice daily.