Studying the Baikal omul size and mass composition (Coregonus migratorius)

The purpose of research is to study the size and mass characteristics of the Baikal omul (Coregonus migratorius (Georgi, 1775)). Objectives: to study the size and percentage of masses of individual parts of the body and organs of the Baikal omul. The objects of the study are the Baikal omul from different places and seasons of catch. Sampling was carried out in accordance with GOST 31339-2006. Standard accepted research methods were used. The study of indicators of size and mass composition was carried out in the laboratory of the department "Standardization, metrology and quality management" at FSBEI HE East Siberian State University of Technology and Management (ESGUTU). Statistical analysis of the results obtained was carried out using analysis of variance using the RStatistics software product. The results of the experimental studies have shown that there are differences in the size and mass composition in the commercial catches of the Baikal omul. The average fishing length of the Baikal omul is 239-294 mm, and the average fish weight is 198-407 g. The greatest differences are observed between omul from different fishing areas. This is due to the fact that specimens of various morpho-ecological groups are found in commercial catches from different fishing areas. For the first time, a study has been made of the mass composition of the Baikal omul. It has been established that the greatest differences in most signs of mass composition are observed between the groups of summer and winter fishing. It is shown that the average yield of butchered Baikal omul is 62.36-65.76 %, while the average percentage of waste is 34.24-37.64 %. Heads (10.55-13.10 %), viscera (7.08-11.08 %) and bones (3.66-5.81 %) account for the largest percentage of waste. The data obtained are consistent with information on the mass composition of other fish species of the genus Coregonus.