Respiratory responses to hypoxia in relation to mode of life of two erythrinid species (Hoplias malabaricus and Hoplias lacerdae)

Abstract

Predominantly, Hoplias malabaricus inhabits stagnant 0, poor environments, whereas Hoplias lacrrdae occurs in well-aerated streams. The present study evaluates the influence of mode of life on 0, uptake and gill ventilation in equally-sized (300 g) specimens of this genus at 25-C. Comparing the species, H . lacerdae was characterized by the highest 0, uptake and gill ventilation combined with a relatively higher cost of breathing and a lower 0, extraction. Both species substantially increased ventilation in response to hypoxia with the difference that H. malaharicus exclusively augmented tidal volume, whereas H. lacerdae also increased breathing frequency.

Karyotypic diversity between allopatric populations of the group Hoplias malabaricus (Characiformes: Erythrinidae): evolutionary and biogeographic considerations

“…Manaus (AM) -Igarapé Mindu 24m + 18sm Bertollo et al (2000), Born & Bertollo (2001) Poconé ( Lemos et al (2002) ecological characteristics favorable to dispersion (survival under adverse conditions) and (d) easy adaptation to new environments (physiological and predation characteristics) (Azevedo & Gomes, 1943;Rantin et al, 1992Rantin et al, , 1993Rios et al, 2002), may explain the considerable karyotype diversity in this group of teleost fish. Such divergence likely stems from different evolutionary histories resulting from population isolation, such that the H. malabaricus karyomorphs may be distinct biological units.…”

“…Thus, such natural obstacles are factors that can reduce the gene flow between populations in the same hydrographic basin, which can even be interrupted, depending on the topography or geomorphology of the region. Hoplias malabaricus is easily found in temporary lakes during the dry season (Okada et al, 2003) due to its higher capacity for survival in environments with a low content of dissolved oxygen and extreme water temperatures in comparison to most other piscivorous teleost fish (Rantin et al, 1992(Rantin et al, , 1993Rios et al, 2002). In the rainy season, H. malabaricus exhibits a high degree of passive dispersion (not intrinsic to the biology of the teleost fish, but dependent on environmental factors), migrating from one stretch of the river to another through strips of water a few centimeters in depth, which is a common condition in floodplains.…”

Effects of water-soluble fraction of petroleum on growth and prey consumption of juvenile Hoplias aff. malabaricus (Osteichthyes: Erythrinidae)

“…Several studies (Rantin et al, 1993;Luz and Portella, 2005) have reported that erythrinids, especially H. aff. malabaricus, have a high degree of resistance to environmental conditions involving hypoxia, long-term feeding deprivation and temperature extremes (Rantin et al, 1992;Rios et al, 2002;Rios et al, 2004;Petry et al, 2007), which negatively affect most of the sympatric fish species (Soares et al, 2006). The resistance characteristics of the trahira are most likely related to its sedentary behavior and low metabolism in contrast to the highly migrant and more active salmonids.…”

Effects of extended absence of flooding on the fish assemblages of three floodplain lagoons in the middle São Francisco River, Brazil

“…Ecological attributes of the fishes captured in the 'Curral-de-Vara', 'Cajueiro' and 'Juazeiro' lagoons, São Francisco River, from September, 1994 to March, 1996. Species denomination followed Reis et al, 2003;1: Sato et al (1987), Lamas (1993); 2: Pompeu & Godinho (2003);3: Carter & Beadle (1931), Bastos (1956), Driedzic et al (1978), Hochachka et al (1978), Kramer et al (1978), Acuña & Sanz (1992), Rantin et al (1992), Machado-Allison (1994); N = non-migratory, Y = migratory, U = migratory trait unknown; herb = herbivore, invert = invertivore, detri = detritivore; N = hypoxia intolerant, Y = hypoxia tolerant.…”