Spatial and temporal variation in population structure of Hemigrammus marginatus (Characiformes: Characidae) in streams of the Ivinhema River Basin, Brazil

Abstract

The present study has assessed spatial and temporal variations in the length structure of Hemigrammus marginatus Ellis, 1911 and estimated growth parameters for the species. Sampling was carried out in five streams in the Vitória and Piravevê sub-basins of the Ivinhema River from January to December 2002. A total of 933 specimens of H. marginatus were caught (97 in the Vitória sub-basin and 836 in the Piravevê sub-basin). Mean length of the individuals caught in the Piravevê sub-basin was shorter (21.58 mm, SD = 4.67) than that of individuals caught in the Vitória sub-basin (29.24 mm, SD = 4.42). Analysis of condition factor calculated from the weight/length relationship revealed that the values were constant both spatially (between sub-basins) and temporally (throughout the year). In the Piravevê sub-basin, the theoretical maximal length estimated for this species was 37.26 mm, with natural mortality rate of 1.22 year¹, growth rate (k) of 0.66 year-1, and growth performance index (w) of 3.80 and 4.25 years of longevity. The input of new individuals in the population occurs twice per year, with greater recruitment at the peak of the rainy season (May) and the peak of the dry season (August)

Reproductive biology of Hyphessobrycon eques (Characiformes: Characidae) in Southern Pantanal, Brazil

“…Reproduction is one of the most important aspects of the biology of a species, since it provides information traits such as fertility, sex ratio, size at first maturation and structure in length, which exhibit variations in response to environmental conditions being able to diagnose the different strategies (Suzuki et al, 2005;Rêgo et al, 2008;Olden and Kennard, 2010;Lourenço et al, 2012;Souza et al, 2014).…”

Fishes from the Private Natural Heritage Reserve Pacatuba Farm and its surrounding areas, Paraíba State, Northeastern Brazil.

“…In this context, H. marginatus population has its greatest input of individuals in the dry season and the lowest in the rainy season (Lawrence et al 2012). The high abundance of this species in the community described here would be explained due to a species recruitment event, once the collection period coincided with the peak months of its population according to Lourenço et al (2012).…”

Estimation of growth parameters of five fish species (Actinopterygii) caught in the central Amazon

“…Finally, as Pauly (1998) reported an inverse pattern between the asymptotic lengths and the growth coefficients of tropical fish, auximetric plots were built for each of the three families to which the species studied here belong: Characidae, Prochilodontidae, and Serrasalmidae. In addition, we utilised other growth parameters found in FishBase (Froese and Pauly 2018), and 21 other studies (Ruffino and Isaac 1995, Isaac and Ruffino 1996, Lizama and Ambrósio 2003, Penna et al 2005, Silva and Stewart 2006, Cunha et al 2007, Gomiero et al 2007, Peixer et al 2007, Santos Filho and Batista 2009, Carmassi et al 2011, Bevilaqua and Soares 2010, Isaac et al 2012, Lourenço et al 2012, Tondato et al 2012, Vicentin et al 2012, Pérez-Lozano and Aniello 2013, Sousa et al 2013, Ambrósio et al 2014, Catarino et al 2014, Vaz unpublished * , Villacorta-Corrêa unpublished ** ) ( Table 2), for these same families. The correlation between the two variables of each of the auximetric plots (log 10 asymptotic length and log 10 growth coefficient) was tested using the non-parametric Spearman rs test.…”