Development, genetic diversity analysis, and transferability of microsatellite markers for Brycon amazonicus.

Brycon amazonicus is a species native to Brazil, with significant socioeconomic importance and immense potential for fish production. It is the second most cultivated species in the Amazon. The lack of specific molecular markers limits genetic research.

Structure and genetic variability of golden mussel () populations from Brazilian reservoirs.

The golden mussel, a highly invasive species in Brazil, has generated productive, economical, and biological impacts. To evaluate genetic structure and variability of populations present in fish farms in the reservoirs of Canoas I (CANFF), Rosana (ROSFF), and Capivara (CAPFF) (Paranapanema River, Paraná, Brazil), eight microsatellite loci were amplified. Five of those eight loci resulted in 38 alleles.

Morphology and muscle gene expression in GIFT and Supreme Nile tilapia varieties reared in two cultivation systems.

Tissue growth in most fishes occurs by muscular hyperplasia and hypertrophy, which are influenced by different regulatory factors, such as myostatin. The current study evaluated the influence of cultivation in hapas and earthen ponds on the diameter of white muscle fibers and on the myostatin (MSTN-1) gene in GIFT and Supreme varieties of tilapia. Fish of both varieties were reared for 204 days and then divided into four developmental stages.

Effect of propolis ethanol extract on myostatin gene expression and muscle morphometry of Nile tilapia in net cages.

Propolis can be used as growth enhancer due to its antimicrobial, antioxidant, and immune-stimulant properties, but its effects on morphometry and muscle gene expression are largely unknown. The present study evaluates the influence of propolis on muscle morphometry and myostatin gene expression in Nile tilapia (Oreochromis niloticus) bred in net cages. Reversed males (GIFT strain) with an initial weight of 170 ± 25 g were distributed in a (2 x 4) factorial scheme, with two diets (DPRO, commercial diet with 4% propolis ethanol extract and DCON, commercial diet without propolis, control) and four assessment periods (0, 35, 70, and 105 experimental days).