Nile tilapia (Oreochromis niloticus L.) fry growth and development effected from feeding with Enzimsporin supplement

The present research has shown the growth and development of Nile tilapia (Oreochromis niloticus L.) fry effected from feeding Enzimsporin probiotic supplement. During the observation period, the weight of tilapia fry population has increased from 119.5g to 619g in the control group, from 121g to 684g in the 1st experimental group 1 and from 119g to 790g in the 2nd experimental group. Thus, the average daily weight gain per fish is 0.44g, 0.51g and 0.6g, respectively in 22 days.

Influence of thinning out and nitrogen fertilizers on photosynthesis and growth of spruce in birch forests of myrtillus type

The effect of different nitrogen doses and cutting on the rate of physiological and growth processes has been studied in birch forests of blueberry type in taiga zone. It has been established that nitrogen has got little effect on the vitality and growth of spruce in mature birch forests because of the light lack. In thinned stands the nitrogen increases the rate of photosynthesis twofold, activates processes associated with the accumulation and subsequent outflow of carbon metabolites from the needles. The result of this nitrogen action is the intensification of growth processes.

Growth and development of spruce undergrowth in uneven-aged birch forests in taiga middle subzone

The influence of uneven-aged birch (blueberry kind of environment vegetation) on spruce undergrowth in Syamzhenskiy district of the Vologda region has been studied. It has been established that the growth and development of spruce plantations depend on the age of the main tree stand. Coniferous undergrowth condition deteriorates with the age of birch.

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