Spawning and larval development of domestic mussel Mytilus coruscus

Abstract

The purpose of this study was to obtain the basic data for mass production of sprouting seedlings of domestic mussel Mytilus coruscus by spawning and larval development. Mature embryos were elliptical immediately after spawning, but they had spherical shape with average diameter of 78.8±2.56 ㎛ and short diameter of 76.8±2.57 ㎛. Embryos were observed at various temperatures from 17 ℃ for 4 hours to 2 ~ 8 hours. After 16 hours, the embryos developed on the surface with cilia. The larvae developed into trochophore larvae in 22 hours after fertilization and actively developed, and developed into D-type larvae within 44 hours. The mean length of the D-type larvae was 123.5±3.08 ㎛ and the height of the larvae was 88.8±2.53 ㎛. From the 13th day after fertilization, late D-type larvae were observed. The mean longitudes of the larvae were 147.9±11.58 ㎛ and 115.0±11.26 ㎛. From the 15th day after the fertilization, the internal organs were formed, and it was confirmed under the microscope whether feeding was taken or not. Korean mussel has been reported to be inhabited mainly in the island area such as Ulleungdo, due to the influence of the alien species joining, and it is a species with high conservation value as domestic native species. Some municipalities in Korea are carrying out studies for the growth of domestic mussel resources, but due to the lack of basic ecological-physiological data on mussels, commerciad spherical shape with average diameter of 78.8±2.56 ㎛ and short diameter of 76.8±2.57 ㎛. Embryos were observed at various temperatures from 17 ℃ for 4 hours to 2 ~ 8 hours. After 16 hours, the embryos developed on the surface with cilia. The larvae developed into trochophore larvae in 22 hours after fertilization and actively developed, and developed into D-type larvae within 44 hours. The mean length of the D-type larvae was 123.5±3.08 ㎛ and the height of the larvae was 88.8±2.53 ㎛. From the 13th day after fertilization, late D-type larvae were observed. The mean longitudes of the larvae were 147.9±11.58 ㎛ and 115.0±11.26 ㎛. From the 15th day after the fertilization, the internal organs were formed, and it was confirmed under the microscope whether feeding was taken or not. Korean mussel has been reported to be inhabited mainly in the island area such as Ulleungdo, due to the influence of the alien species joining, and it is a species with high conservation value as domestic native species. Some municipalities in Korea are carrying out studies for the growth of domestic mussel resources, but due to the lack of basic ecological-physiological data on mussels, commercia