However, the eggs of fish that have already returned to rivers and started to swim upriver are virtually about to be let go and are very hard and not suitable for eating.
ただし、すでに河川に入り遡上をはじめた魚の物は、ほぼ完全に卵がほぐれて、ゴムまりのように硬くなっており食用には適さない。