You Are Trapped on a Deserted Island and Are Dehydrated

You are trapped on a deserted island and are dehydrated and hungry. You have the ability to eat all the marine invertebrates you want or expend energy to catch a few fish. Which one is the better option in the long run?

A) Eat the invertebrates - you don't expend any energy to get them and they are similar in concentration to you so you will not dehydrate as much by eating them.
B) Eat the invertebrates - They contain less dehydrating proteins.
C) If you can catch the fish, they are similar in concentration to you so you will not dehydrate as much by eating them.
D) The fish are more nutritious so you should expend the energy to catch them.