Skibsted, "Determination of carotenoids in salmonoids
," Zeitschrift fur Lebensmittel-Untersuchung und Forschung, vol.
On August 23, the Canadian Food Inspection Agency confirmed whirling disease, a fish disease that affects salmonoids, in Johnson Lake in Banff National Park.Whirling disease has been observed in the United States since the 1950s and is prevalent in the western and northeastern states.
Based on the recommendation of the CFIA, Alberta has put a proactive hold on fish stocking salmonoids until individual fish farms and hatcheries are tested for the presence of the disease.
It has been found that the exogenous application of gonadotropin-releasing hormones (GnRHs) can activate the HPG axis, accelerating maturation and the timing of FW entry and upstream movement in many species of salmonoids. In fish and other vertebrates, the control of reproduction via GnRHs is a complex process that involves the interaction of a number of factors, including the gonadal steroid hormones known as gonadotropin hormones (GTHs) (Urano et al., 1999; Makino et al., 2007).
Furthermore, the behavior and physiology of migrating fish such as salmonoids are also affected by external environmental factors such as photoperiod and water temperature (Duncan et al., 2000).
The screens, required by the National Marine Fisheries Service to address declining salmon populations, have holes the width of a pencil lead - small enough to keep salmonoids from being drawn into the pumps.
Also, river water used to reach the millrace via one intake opening instead of six, which meant faster currents that could overwhelm salmonoids, Williams said.
A Survey of Healthy Native Stocks of Anadromous Salmonoids
in the Pacific Northwest and California.