As far as fishermen were concerned, mollusks didn't have any economic value, and most of those that got inadvertently caught in nets were just tossed back into the sea. Because of the loss of pressure, most of those thrown back wouldn't survive.
對漁民而言，海貝不具經濟價值，無意撈到的海貝大多是直接丟回大海，然而自海底到船上，因為壓力驟減，丟回大海的海貝大多也無法再存活了。