Breeding method of new variety of hard-shelled razor clams

A method for breeding a hard-shelled razor clam strain, comprising:

• a step (a) comprising:
• constructing a plurality of full-sib families of razor clams using a control population of razor clams;
• measuring a growth trait and a shell hardness trait for the plurality of full-sib families to obtain a measured result of the growth trait and the shell hardness trait;
• and
• performing a heritability evaluation based on the measured result to obtain a heritability evaluation result;
• a step (b) comprising:
• during a reproductive season of the razor clams, collecting razor clam individuals from a predetermined sea area to form a base population;
• measuring shell hardness of each razor clam individual in the base population using an electronic hardness tester for material mechanics;
• and
• selecting, from the base population, the razor clam individuals having measured shell hardness greater than a predetermined selection threshold as a breeding population;
• a step (c) comprising:
• washing and sterilizing the breeding population, and then air-drying the breeding population in a ventilated shaded place for 2 to 4 hours;
• and
• inducing spawning of the breeding population by injecting 5-hydroxytryptamine into feet of the breeding population in combination with running-water stimulation to obtain offsprings of the breeding population;
• a step (d) comprising:
• growing out the offsprings to obtain target individuals of a first-generation hard-shell razor clam strain based on the heritability evaluation result;
• and
• a step (e) comprising:
• using target individuals of the first-generation hard-shell razor clam strain as the breeding population, repeating the steps (c) and (d) for 3 to 4 rounds to obtain one or more generations of hard-shell razor clam strains.