The purpose of this work is to increase the rate of development and growth of
Arctic char juveniles, a valuable promising specy for both commercial
cultivation and artificial reproduction. The basis of the new method of the
increasing cultivation biotech efficiency is the use the artificially saline
biostimulating medium. For maximum stimulation of the juveniles growth rate,
they were grown at a commercial farm in table salt solutions of 0.5–1.5‰
concentration, where 2 most important and widely used factors of the same effect
were additionally included — optimal temperature and planting density,
according to the basic principle of the natural impacts complexity. The maximum
weight values (428±23 g) were obtained in a group with pre-sorted leaders of
the lowest planting density (27 pd/m3 ) with that compared to more compacted
(119±15 g) and control in fresh water (93.8±0.52 g) both in the same planting
density (500 pd/m3 ). For the first time, an increase in the growth rate of
Arctic char juveniles was observed when using even a slightly saline medium
(0.5–1.5‰), below the threshold of critical salinity (4–8‰). The main
advantage of growing juveniles in this combined medium — the growth rate
increase to 26.97% was revealed, by comparative analysis. The industrial table
salt solutions of low concentration are proposed to use in combination with
known methods for optimizing the juveniles planting density (as well as
temperature regimes, sorting) to accelerate the growth rate of juveniles that
comparable to the effect of critical salinity in closed water supply systems of
fish farms for yearround rearing.
