37 research outputs found
Cultivo de la trucha caf\ue9 an\ue1droma: una nueva alternativa para la diversificaci\uf3n de la salmonicultura nacional
No full textCon el propósito de aportar información para contribuir al desarrollo del cultivo de la trucha café anádroma (Salmo trutta trutta) en Chile, también llamada seatrout, en este trabajo se revisan los siguientes aspectos: i) características genéticas y origen evolutivo de la trucha café naturalizada existente en el país, ii) rendimiento reproductivo bajo condiciones de cautiverio, and iii) eficiencia del proceso de esmoltificación, tasa de crecimiento y maduración sexual en agua dulce y agua de mar de la trucha café anádroma. Estos últimos parámetros son particularmente relevantes para una apropiada evaluación de su desempeño bajo condiciones de cultivo intensivo. El análisis de estos aspectos indica que las poblaciones naturalizadas de trucha café en Chile presentan un alto grado de variación genética, junto con un probable origen único (línea filogenética Atlántica, norte de Europa); éstas también presentan un rendimiento reproductivo óptimo, que excede aquel observado en otros salmónidos. Además, el proceso de esmoltificación de la trucha café anádroma es equivalente al observado en salmónidos totalmente anádromos, como el salmón del Atlántico y el salmón coho. Asimismo, con excepción de la maduración precoz, que es más alta que en el salmón del Atlántico, sobre todo en los machos, esta variedad también muestra una favorable tasa de crecimiento y sobrevivencia en agua de mar. Todos estos antecedentes indican que el cultivo de la trucha café anádroma es una alternativa interesante, con potencial para ser incorporada en la salmonicultura nacional
Chromosomal characterization of cultured populations of Chilean coho salmon (Oncorhynchus kistuch)
No full textChromosomal characterization of coho salmon samples from three fish farms in southern Chile (Polcura, Castro and Coyhaique) was carried out in order to compare their chromosome constitutions. All populations had a 2n = 60; however, Polcura and Coyhaique had a different chromosome arm number (NF = 110; 40m + 10sm + 10st/t) than Castro (NF = 108; 40m + 8sm + 12st/t). Variation in NF was due to chromosome pair 25, which was submetacentric in Coyhaique and Polcura, but subtelocentric in Castro. In all karyotypes, a large submetacentric chromosome pair exhibited an interstitial secondary constriction in the short arm. The observed variability in chromosome arm number agrees with previous reports for O. kisutch, and in this particular case it seemed to be caused by a pericentric inversion of pair 25. Cultured populations of Chilean coho salmon are, therefore, likely to be cytogenetically variable.A caracterização cromossômica de amostras de salmon tipo coho de três criações de peixes do sul do Chile (Polcura, Castro e Coyhaique) foi feita com a intenção de comparar suas constituições cromossômicas. Todas as populações apresentaram 2n = 60; contudo, Polcura e Coyhaique tiveram um número de braços cromossômicos (NF = 110; 40m + 10sm + 10st/t) diferente de Castro (NF = 108; 40m + 8sm + 12st/t). A variação no NF deveu-se ao par cromossômico 25, que era submetacêntrico em Coyhaique e Polcura e subtelocêntrico em Castro. Em todos os cariótipos, um grande par cromossômico submetacêntrico exibiu uma constrição secundária intersticial no braço curto. A variabilidade observada no número de braços cromossômicos concorda com relatos prévios para O. kisutch e, neste caso particular, parece ter sido causada por uma inversão pericêntrica no par 25. Portanto, populações cultivadas de salmão chileno do tipo coho provavelmente são citogeneticamente variáveis
Figure 3 from: Colihueque N, Corrales O, Yáñez M (2017) Morphological analysis of Trichomycterus areolatus Valenciennes, 1846 from southern Chilean rivers using a truss-based system (Siluriformes, Trichomycteridae). ZooKeys 695: 135-152. https://doi.org/10.3897/zookeys.695.13360
No full textFigure 1 from: Colihueque N, Gantz A, Parraguez M (2021) Revealing the biodiversity of Chilean birds through the COI barcode approach. ZooKeys 1016: 143-161. https://doi.org/10.3897/zookeys.1016.51866
No full textFigure 1 Maximum likelihood (ML) tree derived from the analysis of COI sequences for 76 bird species from Chile. The numbers at the nodes represent the percentage of bootstrap support. GenBank or BOLD accession number for each specimen are shown. Scale indicates the sequence divergence estimated from the number of nucleotide substitutions per site. The asterisk indicates the contradictory clusters found in the tree. Charadrius alexandrinus is currently known as Charadrius nivosus
Figure 4 from: Colihueque N, Corrales O, Yáñez M (2017) Morphological analysis of Trichomycterus areolatus Valenciennes, 1846 from southern Chilean rivers using a truss-based system (Siluriformes, Trichomycteridae). ZooKeys 695: 135-152. https://doi.org/10.3897/zookeys.695.13360
No full textUse of fluorescent stain for identification of sex chromosomes in manipulated parents and progenies of rainbow trout
No full textSupplementary material 2 from: Colihueque N, Gantz A, Parraguez M (2021) Revealing the biodiversity of Chilean birds through the COI barcode approach. ZooKeys 1016: 143-161. https://doi.org/10.3897/zookeys.1016.51866
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Cultivo de la trucha cafe anadroma: una nueva alternativa para la diversificacion de la salmonicultura nacional
No full textSupplementary material 1 from: Colihueque N, Arriagada A, Fuentes A (2020) Distribution modelling of the Pudu deer (Pudu puda) in southern Chile. Nature Conservation 41: 47-69. https://doi.org/10.3897/natureconservation.41.53748
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Supplementary material 2 from: Colihueque N, Arriagada A, Fuentes A (2020) Distribution modelling of the Pudu deer (Pudu puda) in southern Chile. Nature Conservation 41: 47-69. https://doi.org/10.3897/natureconservation.41.53748
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