铁钩如果插在张开的蚬壳里，贝壳立即就会将铁钩夹住，这时钩蚬人凭感觉，将手中的铁钩轻轻地扭转一下，这时铁钩就会钩住蚬壳;紧接着就慢慢地将蚬钩从河水中抽上水面，从铁钩上取下蚬子，然后又继续把蚬钩插入河水中不停的捣动着取拿着蚬子。
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