Dirbtinai veistų ir natūralaus neršto lašišų jauniklių morfofiziologinių ir fiziologinių rodiklių palyginimas

• Main Author: Kazlauskas, Mindaugas
• Other Authors: Kazlauskienė, Nijolė, Baranauskas, Kazimieras
• Format: Master Thesis
• Language: Lithuanian; English
• Published: Institutional Repository of Lithuanian University of Educational Sciences 2009
• Subjects: salmon; juveniles; biological parameters; artificially breeding and naturally spawning; Salmo salar
• Online Access: http://leu.oai.elaba.lt/documents/1866366.pdf; http://leu.lvb.lt/LEU:ELABAETD1866366&prefLang=en_US

The aim of the present study was to investigate and compare salmon juveniles [reared in the Žeimena hatchery (I group), released in the spring and caught in autumn in the Siesartis River (II group), and wild salmon juveniles caught in the Žeimena River (III group)] morphophysiological and physiological state, and the evaluation of morphological, morphophysiological, liver morphopatological and biochemical, haematological parameters. The results of the study showed that salmon fry released in spring and juveniles caught in autumn in the Siesartis River morphological (Q, L), morphophysiological (condition factor, Q/L), liver morphopatological (liver somatic index, color and consistency, and the amount of fat in the liver) statistically differed from the juveniles reared in the Žeimena hatchery (I group), and was close to wild juveniles from the Žeimena River (III group). Comparing the haematological parameters of juveniles reared in the Žeimena hatchery (I group) with wild juveniles from the Žeimena River (III group) we saw the significant differences of hematocrit and leukocyte concentrations in blood. However, red cell and haemoglobin concentration in blood of salmon juveniles reared in hatchery indicates that in the organism is the intensity of blood and normal metabolic processes. Based on the results of our research salmon juveniles rearing conditions in the hatchery will be improved, as well as their functional status, immune resistance to diseases, and their ability shall increase quickly to adapt to the changing of the natural environmental conditions and survival in the nature.