for young fish is 3.0. The other peak activitiesemerge in pH 2. 5, 5. 0～6. 0 in juvenile, and the other peak activities emerge in pH 2. 5, 5. 5and 7. 5 in young fish. It is suggested that the descend of the most suitable pH for α-amylaseas the growth of P. major is due to that development and the perfecting of the digestive sys-tem.
Contents of the common nutritive composition were analyzed by national standard method in the muscle of small juvenile Schizothorax Prenanti ( average weight: 1.9±0.2g) , large juvenile fish (average weight: 72.4±7.3g) and adult fish ( average weight : 501.8± 35.5g ) , and so was the composition of fatty acids , amino acids .
In the period of feeding, the technology of the rotifer and bring shrimp larvae nauplii being strengthened with the HUFA and the technology of the formula feeds substituting the fresh bait in the juvenile fish stage and young fish stage had achieved good results.
And third, from small juvenile fish to adult fish the contents of UFA ranged were very little, but the contents of HUFA had evident variety, especially, there were notable difference between large juvenile fish and adult fish (P<0.05).
High genetic differentiation of both natural and "hatchery" juvenile fish was revealed.
Larvae of the second group had severe pathologies of inner organs that caused 100% mortality before the age of 15 days, but no pathomorphological changes in the organs of larvae and juvenile fish of the third group were revealed for up to 40 days.
taczanowskii is a polyphage (it more often eats amphipods, decapods, and juvenile fish).
Alteration of thermoregulation behavior in juvenile fish in relation to satiation level
Significant alterations of thermoregulation behavior appear in juvenile fish one day after food deprivation.
The test results are: (1) There are linear correlations between 24h LC50 and 48h LC50 of Zn2+ for Silver Carp fingerling and temperature.
1 included large (L), medium (M), and small (S) fingerling sizes from each of the control (C), selected upward (+) and selected downward (-) lines for body weight.
Fingerling rainbow trout (N=436) were trained in one trial with brief electric shock (2.0 V/cm) to suppress their spontaneous upstream swimming into a quiet well.
These morphological changes reflect a general decrease in activity and a shift from a sub-carangiform to a labriform mode of swimming following transition from the fingerling to adult stage of the life cycle.
Acute toxicities of selected herbicides to fingerling channel catfish,Ictalurus punctatus