Publications by authors named "Shotaro Irachi"
Seasonal timing is important for many critical life history events of vertebrates, and photoperiod is often used as a reliable seasonal cue. In mammals and birds, it has been established that a photoperiod-driven seasonal clock resides in the brain and pituitary, and is driven by increased levels of pituitary thyroid stimulating hormone (TSH) and brain type 2 iodothyronine deiodinase (DIO2), which leads to local increases in triiodothyronine (T). In order to determine if a similar mechanism occurs in fish, we conducted photoperiod manipulations in anadromous (migratory) Atlantic salmon (Salmo salar) that use photoperiod to time the preparatory development of salinity tolerance which accompanies downstream migration in spring.
View Article and Find Full Text PDFChanges in glycogen concentration and gene expression levels of glycogen-metabolizing enzymes in muscle and liver of developing masu salmon.
Comp Biochem Physiol A Mol Integr Physiol
November 2018
Article Synopsis
- * The study found that glycogen levels in both the bodies and yolk sacs of developing masu salmon increased as they grew, but there was a temporary decrease in the yolk sac right after hatching, indicating both glycogen synthesis and breakdown.
- * Researchers also identified and examined the gene expression of enzymes involved in glycogen metabolism, revealing that certain genes related to glycogen synthesis and breakdown were actively expressed in the liver, muscle, and yolk sac during development and hatching.