Freight
You want to change your shellfish into freight so you can transport it. That means packing them up into giant freight containers.
Imagine changing your shellfish from loose, wet form, to solid freight form. It's actually a lot of hard work.
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To move this freight, you need a car (か). You strap all of the freight containers to the top of your car, stacked nice and high and precarious, so you can move it.
Picture all of this freight stacked on top of your car. As you drive the car, every turn you make feels slow and heavy from the freight weight.