Age and growth ofAstyanax eigenmanniorum(Cope) (Pisces, Characiformes) from San Roque Lake, Argentina

Barla, María Julia; Freyre, Lauce Rubén; Giraudo, Liliana; Gutiérrez, Mercedes; Sendra, Eduardo Daniel

doi:10.1080/01650528809360759

Cited by 5 publications

(2 citation statements)

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“…Females of A. aeneus were larger than males, this same trait was reported in other Characiformes (Agostinho & Júlio-Júnior 1999) e.g. Astyanax bimaculatus, A. schubarti (Nomura 1975), A. eigenmanniorum (Barlá et al 1988), A. fasciatus (Mora et al 1997, Nomura 1975, A. scabripinnis (Veloso-Júnior et al 2009), as opposed to A. aurocaudatus in which males are larger than females (Román-Valencia & Ruiz 2005). Large females size is advantageous since fecundity is increased, while large males are at greater advantage during reproduction of producing potentially more, and larger, offspring (Nikolsky 1963).…”

Section: Discussionsupporting

confidence: 72%

Reproductive traits and population structure of Astyanax aeneus (Characiformes: Characidae) from a subtropical river in Mexico

Trujillo-Jiménez

Sedeño‐Díaz²,

Camargo

et al. 2013

RBT

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Rasgos reproductivos y estructura de la población de Astyanax aeneus (Characiformes: Characidae) de un río subtropical en México. Champotón River is an unknown area within the Mesoamerican hotspot in Southestern México. Reproductive traits and population structure of Astyanax aeneus were analyzed along an environmental gradient of the upper, middle and lower sections of the river, where diverse environmental factors were recorded. For this, nets were cast for 1h at each site and A. aeneus were collected from all sections with sweep nets (5 and 10m long by 5m deep, 0.03m mesh size) and a casting net (0.05m mesh size). At each study site and campaign, a total of 80 specimens (in average) were collected and were fixed in 10% formaldehyde for further analysis. Population structure by size was analyzed for each study site, based on the relative frequencies by standard length classes. The length-weight relationship was determined, and the identification of gonadal developmental stages, reproductive period, size at first sexual maturity, relative fecundity, sex ratio and somatic indexes (gonadosomatic, hepatosomatic and Fulton's condition factor) were also assessed. Seven size classes were found in the upper and middle sections, and nine downstream, with seasonal and spatial pattern in size-class frequency distribution. Size at first maturity was 45.7mm for females and 40.8mm for males. The maximum relative fecundity was recorded at the downstream site and was positively correlated with body weight and standard length. Sex ratio (1.8:1 males: females) differed significantly from expected values (1:1). Gonadosomatic index scores indicated that the reproductive period of this species in the Champotón River was from April to July, during the warm and wet season. Hepatosomatic index was negatively correlated with the Gonadosomatic index, evidencing transfer of energy from the liver towards gamete production. This strategy enabled A. aeneus to maintain robustness during the study period with tiny changes in condition factor. A. aeneus in the Champotón River, as opposed to South American river congeneric species of similar size, shows early sexual maturity, a short reproductive period with high gonadosomatic index values, and high fecundity, a trade-off for the short reproductive period. Spatio-temporal segregation was evident: breeders congregate downstream, while juveniles prefer the upper reaches. This pattern allows A. aenus to be successful in a river with high frequency of hurricanes. Rev. Biol. Trop. 61 (2): 769-786. Epub 2013 June 01.

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Section: Discussionsupporting

confidence: 72%

Reproductive traits and population structure of Astyanax aeneus (Characiformes: Characidae) from a subtropical river in Mexico

Trujillo-Jiménez

Sedeño‐Díaz²,

Camargo

et al. 2013

RBT

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“…The “traditional” von Bertalanffy growth model was the best fitted to the data and allowed tracing satisfactory growth curves with the large dataset obtained from laboratory-reared fish. This same equation has often been used to model the growth of other tropical characiform or related fishes of all sizes: the tambaqui Colossoma macropomum , the largest characin of South America which may reach 1 m [ 33 ], the red-bellied piranha Serrasalmus nattereri of the Amazonas [ 34 ], the sister species of A. mexicanus , Astyanax eigenmanniorum from Argentina [ 35 ], or the catfish Calophysus macropterus [ 36 ], a siluriform that belongs, with characiforms, to the Ostariophyses. Here for wild A. mexicanus , the sample was too small at the extremes of the growth curves (very small/young and very large/old), and therefore, it would be worth continuing sampling fish for extreme sizes in future expeditions, to obtain modeled growth curves for wild animals.…”

Section: Discussionmentioning

confidence: 99%

Comparing growth in surface and cave morphs of the species Astyanax mexicanus: insights from scales

Simon

Elleboode

Mahé

et al. 2017

EvoDevo

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BackgroundLife in the darkness of caves is accompanied, throughout phyla, by striking phenotypic changes including the loss or severe reduction in eyes and pigmentation. On the other hand, cave animals have undergone constructive changes, thought to be adaptive, to survive in this extreme environment. The present study addresses the question of the evolution of growth in caves, taking advantage of the comparison between the river-dwelling and the cave-dwelling morphs of the Mexican tetra, Astyanax mexicanus.ResultsA sclerochronology approach was undertaken to document the growth of the species in these two very distinct habitats. Scales from 158 wild Astyanax mexicanus specimens were analyzed from three caves (Pachón, Tinaja and Subterráneo) and two rivers (Rio Gallinas and Arroyo Lagarto) in San Luis Potosi and Tamaulipas, Mexico. A 10–13% reduction in scales size was observed in the cave morphs compared to the surface morphs. Age could be reliably inferred from annual growth increments on the scales from the two morphs of the species. Further comparisons with growth curves in laboratory conditions, obtained using the von Bertalanffy growth model, were also performed. In the wild and in the laboratory, cavefish originating from the Pachón cave reached smaller sizes than surface fish from three different locations: Rio Gallinas and Arroyo Lagarto (wild sampling) and Texas (laboratory population), respectively. Wild Pachón cavefish also seemed to grow to smaller sizes than the two other wild cavefish populations studied, Tinaja and Subterráneo. Finally, growth in the laboratory was faster than in the wild, particularly in the two first years of life.ConclusionsThese data suggest that cavefish originating from the Pachón cave are subjected to an intrinsic limitation of their final size, which is at least in part independent from energy/food availability. This growth limitation may be an advantageous way of limiting energy expenditure and food needs in the cave environment. Moreover, growth regulation evolved differently in independently evolved cave populations. These results are discussed with regard to the sources of energy or general ecological conditions present in caves, and to the differences in behavior or feeding skills known in cavefish.

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Environmental influences in the population dynamics of Psalidodon paranae (Characidae) from a Neotropical microbasin

Silveira,

Aranha,

Menezes

et al. 2024

Environ Biol Fish

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Age and growth ofAstyanax eigenmanniorum(Cope) (Pisces, Characiformes) from San Roque Lake, Argentina

Cited by 5 publications

References 1 publication

Reproductive traits and population structure of <i>Astyanax aeneus</i> (Characiformes: Characidae) from a subtropical river in Mexico

Reproductive traits and population structure of <i>Astyanax aeneus</i> (Characiformes: Characidae) from a subtropical river in Mexico

Comparing growth in surface and cave morphs of the species Astyanax mexicanus: insights from scales

Environmental influences in the population dynamics of Psalidodon paranae (Characidae) from a Neotropical microbasin

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