tailieunhanh - Báo cáo khoa học: " Parental Background Predisposes Baltic Salmon Fry to M74 Syndrome"

Tuyển tập các báo cáo nghiên cứu về bệnh thú y được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành thú y đề tài: Parental Background Predisposes Baltic Salmon Fry to M74 Syndrome. | Acta vet. scand. 2002 43 127-130. Brief Communication Parental Background Predisposes Baltic Salmon Fry to M74 Syndrome By P Koski National Veterinary and Food Research Institute Oulu Regional Unit Oulu Finland. M74 syndrome is a thiamine responsive disease of Baltic salmon the Baltic group of Salmo salar L. leading to the death of nearly all yolk-sac fry of certain females see . Koski et al. 1999 . Borjeson et al. 1995 reported that M74 syndrome in Baltic salmon in Swedish rivers was bound to the females while milt from wiggling males - fish showing symptoms of a thiamine related-illness Larsson Haux 1996 Amcoff et al. 1999 - produced healthy offspring. In Finnish salmon farming farmed broodfish produce the bulk of the eggs needed in restocking programmes. Both wild fish which have returned from a feeding migration to the Baltic Sea proper and farmed salmon eggs and milt were available for this experiment. The experiment was performed to determine whether M74 syndrome is associated only with wild salmon and not with farmed fish and also whether mortality is associated with the eggs or the sperm or both. A cross-fertilization experiment was performed at Lautiosaari State Fish Hatchery Keminmaa Finland in 1993-94. The wild fish were caught from the Bothnian Bay at the mouth of the River Simo in summer 1993 and kept under similar conditions to the broodfish described in Koski et al. 1999 . Farmed broodfish of the River Simo strain of the Baltic salmon were held at Taivalkoski Game and Fisheries Research males and River Simo State Fish Farm females and were fed on standard commercial dry salmon pellets. On 5 October 1993 male and female gametes from these 2 fish farms were brought to the hatchery of Lautiosaari for fertilization together with gametes from the wild salmon. The eggs of 10 farmed and 10 wild females were fertilized with the milt of 10 farmed and 10 wild males. The milt of each individual male was only used to fertilize eggs from one farmed and one .