If the word means 'the liquid coming out maintains it,' 'Heshiko' is a piece of ancient wisdom to prevent fish from rotting and to preserve them for a long time, while if the word means 'the liquid coming out creates it,' it can be understood as a means to create its unique flavor.
「にじみ出る液がそれを護持する」ならば「へしこ」は魚の腐敗を防ぎ長期保存する古代人の知恵であり、「にじみ出る液がそれを生成する」の意味ならば、独特のうまみを生み出す技法ととることもできる。