منابع مشابه
The growth of brown trout (Salmo trutta Linn.); factors influencing the growth of trout fry.
It has long been known that brown trout (Salmo trutta Linn.) grow to different sizes in different waters, and there has been much speculation concerning the factors determining these differences. Dahl (1918-19) suggested that the food supply and the degree of crowding were important; also that small, slowly growing trout were derived from smaller ova than those growing more rapidly. Southern (1...
متن کاملSteroidogenesis in the gonads of rainbow trout fry (Salmo gairdneri) before and after the onset of gonadal sex differentiation.
Gonadal homogenates of rainbow trout from D(ay) 60, D100 and D200 after fertilization have been incubated in vitro in the presence of dehydroepiandrosterone-3H to demonstrate 3 beta-hydroxysteroid dehydrogenase (3 beta-HSD) and delta 5,4-isomerase activity, of pregnenolone-3H to assess the synthesis of "progestins" and of androstenedione-3H to determine oestrogen synthesis in the ovaries and th...
متن کاملUptake of 106Ru by eggs and fry of rainbow trout.
The experimental studies on uptake and accumulation of 106Ru by artificially fertilized eggs, advanced fry and fingerlings of rainbow trout have been conducted. The accumulation in the egg previously treated with drugs for control of bacterial growth on the egg was more rapid and higher than that in non-treated egg. The major part of 106Ru in the egg was associated with the egg capsule on hatch...
متن کاملThe Spatial Distribution of Some Chromite Deposits in Iran, Using Fry Analysis
The spatial distribution of mineralization is the foremost concern in regional exploration and it could be considered as a very important tool in the investigation of mineral deposits. There are several data manipulation methods by which the data can be evaluated. Fry analysis is a good method to determine the direction(s) of maximum continuity of the deposits and could be used in different typ...
متن کاملThe use of probiotics to protect fish against rainbow trout fry syndrome
Flavobacterium psychrophilum causes high levels of mortalities in aquaculture, especially in salmonid culture during the early life stages of rainbow trout (Oncorhynchus mykiss, Walbaum) [e.g. 1]. Although antibiotics have been successful in treating F. psychrophilum infections there can be problems with resistant strains. Probiotics, defined as beneficial live micro-organisms when administered...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1925
ISSN: 0028-0836,1476-4687
DOI: 10.1038/116573a0