Tolerância aguda e crônica de adultos de beta, Betta splendens, à salinidade da água

Abstract

Acute and chronic salinity tolerance in adult siamese fighting fish, Betta splendensABSTRACT -Salinity tolerance of Betta splendens was evaluated in a complete randomized design, with six salt concentrations in the water (0; 3; 6; 9; 12 and 15 g common salt/L) with five replications (1 fish/replication). Adult female B. splendens were individually placed in aquariums in an incubation chamber at 26 ± 0.2ºC and 12-hour photoperiod. Fish were fed to satiation, once a day, with commercial diet. Feed intake and survival rate were measured every 12 hours. To evaluate the effect of acute salinity, the mean survival time and median lethal salinity-96 h were calculated, while the chronic effect (18 days) was assessed by calculating the survival salinity maximum and median lethal salinity. The mean survival time was significantly lower at 15 g/L water salinity. The median lethal salinity-96 h calculated was 11.88 g/L, the survival salinity maximum was between 6 and 7 g/L, and the median lethal salinity was 9.35 g/L. There was a significant interaction between feeding time and water salinity. Considering that the B. splendens is a freshwater species, it was concluded that this species demonstrated a high tolerance to water salinity.

Effects of iodized salt on the histopathology of the gills and liver in Rhamdia quelen and Metynnis maculatus

“…The tolerance of fish to a given compound can vary depending on the age/size of the specimens used Marchioro and Baldisserotto (). Nevertheless, the 96‐h LC 50 values calculated in this study (11.4 g L −1 for R. quelen and 10.8 g L −1 for M. maculatus ) were very similar to those obtained in other studies available in the literature (Marchioro ; Marchioro & Baldisserotto ; Bringolf, Kwak, Cope & Larimore ; Zuanon, Salaro, Veras, Tavares & Chaves ).…”

Development of the digestive tract in first feeding larvae ofBetta splendensRegan, 1910

“…Betta splendens Regan 1910, originated in Southeast Asia (Thailand, Malaysia), and is known as the Siamese fighting fish due to an aggressive behaviour between the males (Giannecchini, Massago, & Fernandes, ). It is reared in captivity worldwide as an aquarium fish for its favourable characteristics such as a broad variety of colours, long and wide fins, and the presence of an accessory respiratory organ that allows it to be kept in small tanks with no aeration (Zuanon, Salaro, Veras, Tavares, & Chaves, ). Because of its popularity and high profitability, B. splendens is an important species in the ornamental fish market and industry (Chapman, Fitz‐Coy, Thunberg, & Adams, ).…”

Larvicultura do betta em água levemente salinizada

“…For instance, salinity of 10 g NaCl L -1 killed only 12.5% of B. splendens larvae during the first 24 hours, but after 96 hours it ended up being lethal for 97.5%. However, the LC 50 96 h for B. splendens larvae was lower than the reported for adult of the same species, 11.88 g NaCl L -1 (ZUANON et al, 2009). The saline tolerance may change during fish development, as already showed for bonefish (Albulidae: Albula) (PFEILER, 1981) and mangrove red snapper (Lutjanus argentimaculatus) (ESTUDILLO et al, 2000).…”

“…The use of sodium chloride (NaCl) in water has proved to be an important rearing protocol during the production of larvae (SANTOS and LUZ, 2009;LUZ and SANTOS, 2010;LUZ et al, 2012;JOM ORI et al, 2012;JOMORI et al, 2013) and juveniles (ZUANON et al, 2009;SALARO et al, 2012) of freshwater fish species. In literature, tolerance of Betta splendens to salinity was been reported by ZUANON et al (2009) and PUELLO-CRUZ et al (2010). However, there are no references of the median lethal salinity estimates to Siamese fighting fish larvae.…”