Fish Net : For the automated collection of fish
Fish Bait : Mash potatoes to make bait for the Fish Net
Replaceable Nets : made out of rope and/or thatch
Changes : Item nets and Fish Nets need to be replaced or repaired with new Replaceable Nets when they get used to much
Changes : every time you kill the shark it gets harder to kill and attacks more or the species of shark changes and each has their own stats and abilitys
These are some ideas I thought of and hope you take a look at what I think should be added. =) please and thanks