unknown egg sacs? help needed with ID please

Observation - unknown egg sacs? help needed with ID please. Description: unfortunately, no photo available. Was scrubbing bottom of boat, scraped off huge clusters of what seemed to be egg sacs (numbering in the hundreds), semi translucent, some sort of embryo (orangey colour, shape indistinct) moving gently inside. Each sac

unfortunately, no photo available. Was scrubbing bottom of boat, scraped off huge clusters of what seemed to be egg sacs (numbering in the hundreds), semi translucent, some sort of embryo (orangey colour, shape indistinct) moving gently inside. Each sac approx 7cm long, approx 4cm across, gelatinous and fluid filled. Can't find any photos that resemble what I saw - wondered whether they were jelly fish eggs, or some sort of fish?