Determination of favourable biotechnological conditions for Chironomus larva cultivation and development

Abstract

The cultivation of Chironomus larva under artificial conditions needs necessary conditions in the vivarium to provide the biological characteristics of its reproduction, growth and development. Chironomus larva is biologically valuable feed and source of protein for many young species of fish. Being the natural feed it is of great demand now days. The article presents the research results connected with the optimal water mass ratio and the nutrient medium for Chironomus larva. It has been prouved that the auxiliary agents have positive influence on Chironomus mosquitoes egg laying. The study has been conducted in the vivarium of Bila Tserkva NAU Research Institute of Food and Animal Products Processing Technologies. The observation methods and statistical techniques have been used to establish the optimal technological parameters. It has been scoped that Chironomus larva survives better in the nutrient medium, where the water mass ratio of silt is 1:5 and 1:6. There is a bigger amount of larva survival in these examples (in 5.6% times) in comparison with the control group (the ratio of water to silt is 1:2). There is the biggest amount of Chironomus larva deathratein the medium with the water mass ratio of silt 1:1. The use of auxiliary agents in the nutrient medium has a positive effect on Chironomus egg laying. After washing the nutrient medium, it was found that the optimal amount of auxiliary agents was 40 items bigger (20 floating and 20 immersed in sludge), but their use allows to increase the number of eggs laid in 1.2 times. Key words: silt, cultivation biotechnology, Chironomus, larvae, auxiliary agents, water to silt ratio, the survival of Chironomus larvae, water.