Despite the high global invasion profile of Gambusia holbrooki, there is limited knowledge its population dynamics, especially biological parameters for fine-scale delineation recruitment events that can provide a basis controlling this short-lived invasive species. Key to daily ageing otoliths, and in study 193 (~ 50%) 394 wild fish sampled from an invaded wetland were successfully aged. Incre...

In fish, little is known about sex-specific differences in physiology and performance of the heart whether these manifest during development. Here for first time, rates embryogenesis Gambusia holbrooki, from onset (HRs) to just prior parturition, was investigated using light cardiogram. The genetic sex embryos post-verified a marker. Results reveal that resting time significantly increase (p &l...

heterophyidosis is a fish-transmitted disease in khuzestan province, therefore a total of 900 fresh water fishes belonging to cyprinus carpio, liza abtt and gambosia affinis, were collected from canals of mazreeh district in the central area of khuzestan. in 44%, metaccrcariae of three small flukes of human including haplorchis taickut, haplorchis pumilio, stellanichasmus falcamtus were found. ...

Sexual harassment is common among poeciliid fish. In some fishes, males show a high frequency of sneak copulation; such sexual activity is costly to the females in terms of foraging efficiency. In mosquitofish (Gambusia holbrooki), when males are present, the distance between females tends to decrease, and this behavior has been interpreted as an adaptive strategy to dilute the costs of male se...

Male harassment is a classic example of how sexual conflict over mating leads to sex-specific behavioural adaptations. Females often suffer significant costs from males attempting forced copulations, and the sexes can be in an arms race over male coercion. Yet, despite recent recognition that divergent sex-specific interests in reproduction can affect brain evolution, sexual conflict has not be...

Invasive species are one among many threats to biodiversity. Brazil has been spared, generically, of several destructive invasive species. Reports of invasive snakes' populations are nonexistent, but the illegal pet trade might change this scenario. Despite the Brazilian laws forbid to import most animals, illegal trade is frequently observed and propagules are found in the wild. The high speci...

The cadmium contents in muscle, brain, gills, liver , intestine and testis from exposed control animals were determined by atomic absorption spectroscopy. experiments planned three series of a total 95 fish employing the static test method acute toxicity. Five fishes placed each concentrations sublethal (5, 15 25mg/l) for two periods (24 96h). performed as 3 replicates, Cd accumulation differen...