Publications by authors named "Natalia Lam"
Article Synopsis
- Genetic diversity in zebrafish may lead to some individuals being better able to tolerate soybean meal diets, potentially improving growth rates.
- The study analyzed specific gene variations (SNPs) in zebrafish that show different growth responses to a soybean meal diet with added saponin compared to a fish meal diet.
- Four SNPs linked to three immune-related genes were found to influence growth in response to the soybean meal diet, suggesting these genetic markers could help improve selection for more tolerant fish in aquaculture.
Cytogenetic studies in marine fish are scarce, and elemental cytogenetic information is available for not >2% of the species. Traditional cytogenetic methods require living individuals for their application, making the analysis of marine ichthyofauna very difficult. In this study, we present a detailed new protocol to obtain cytogenetic preparations from marine fish, through access to specimens in postmortem condition.
View Article and Find Full Text PDFThe molecular mechanisms underlying fish tolerance to soybean meal (SBM) remain unclear. Identifying these mechanisms would be beneficial, as this trait favors growth. Two fish replicates from 19 experimental families were fed fishmeal-(100FM) or SBM-based diets supplemented with saponin (50SBM + 2SPN) from juvenile to adult stages.
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- Valenciennes, 1839 is a genus of freshwater fish found in the South American Altiplano, with this study focusing on the cytogenetic characteristics of a specific endemic species from Chile.
- The research employed both classical and molecular methods to analyze the distribution of repetitive DNA sequences and constitutive heterochromatin, revealing that the diploid number of chromosomes is 48.
- Findings highlighted significant features such as the location of nucleolar organizing regions (NORs) and the presence of specific DNA sequences, contributing to insights into the chromosomal evolution and conservation status of these fish.
A new genus and species, Pseudorestias lirimensis, is described from the southern part of the Chilean Altiplano. While sharing several characters that clearly align the new species with Orestias, this new fish is characterized by numerous autapomorphies: the Meckel cartilage is a continuous cartilage that broadly expands posteriorly (in large specimens, it keeps its anterior part and is resorbed posteriorly), the basibranchials are fused into one long element, the second pharyngobranchial is not displaced dorsally over pharyngobranchial tooth plate 3+4, but they are aligned, the anterior and posterior ceratohyals are closely articulated keeping a scarce amount of cartilage between both bones and ventral to them, ossified middle and distal dorsal radials are present in females as well as ossified middle and distal anal radials. Pseudorestias lirimensis presents strong sexual dimorphism associated to size.
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