With nets, you don't need bait, so the mechanic is the same as before. It takes a lot of yarn to produce a net, but that's pretty realistic and you can gather enough nettles for it in the summer.
With fishing rods, you do need to use bait, but I did 100 trials with various kinds of bait and discovered that even bits of useless vegetation like half a nettle leaf is usually good enough for a roach, and once you have a roach you can use the roach as bait to get a pike or salmon. I have had characters survive doing nothing but fishing with poor starting fishing skills in recent versions, you just have to gather some berries/leaves/flowers and be a bit patient and be prepared to get pretty hungry before your fishing skill gets high enough for it to start to pay off.
If your skill is high, then it doesn't even need much patience,you should be fine pretty quickly.
Average results for 100 trials with high fishing skill:
No bait: 30 grams per fishing attempt -- a roach weighs 150 grams, so this is about one in 5 fishing attempts gets you a roach
Berries: 430 grams per fishing attempt - that's about 3 roaches per fishing attempt, though of course sometimes you get nothing and somethings you get 10 roaches.
Leaves: 460 grams per fishing attempt
Mushrooms: 480 grams per fishing attempt
Flowers: 620 grams per fishing attempt - that's 4 roaches or two perches!
Roots: 630 grams per fishing attempt
raw fish: 1.48 kg per fishing attempt, that's why i said you should always use roaches as bait for more fishing
raw meat: 1.94 kg per fishing attempt! That's a lot!
What I recommend is that you download the latest version of the game and put it in a different folder and make a new character with it and see how you like it. Don't migrate your characters until you've decided that you liike how things are now. Save your 3.63 version somewhere else so that you can go back to it if you want.
In order to migrate your characters all the way to 3.85 you'll have to get some intermediary versions. You'll need 3.72 to migrate the 3.63 characters, and then 3.81 to migrate the 3.72 characters and then finally the latest version 3.85 can migrate the 3.81 characters