just a thought: spider's eyes are valuable gems in necromunda, iirc (or rather, *some* spider's eyes are valuable gems). just saying

^^
(you can all thank me later that instead of getting gems by digging in dirt that won't try to kill and eat you, instead you have to go hunting for giant spiders floating on rafts in the ooze).
as far as various "farming" industries... hmmm... let me go dig up the old hive ken article...
hmmm... let's see... wildsnake hunters (which use a "wildsnake catchpole") can get wildsnake skins and of course wildsnake.
spider hunters (which get a great big spear gun to hunt gigantic spiders). dangerous job (about half the time you use it, you get injured in some way), but can get meat, venom, eyes from a gigantic raft spider (up to 8, count as gems i suppose), a tank spider chitin which is armor save 5+, a chameleon spider which makes you harder to hit at long ranges, stiletto spiders which can yield 2 venom daggers, or a really large spider that has some random equipment in it's gut. an even bigger one that he can pluck an eye from and gains fear immunity. and a super-gigantic one, called a gigantic albino mare raft spider, with super-expensive eyes (if you actually manage to kill this thing, i presume you wouldn't be too eager to let it's eyes get used to skill up something unless you really value that thing). note that tank spiders and everything after that are quite rare (roll a 6 to get a chance at *one* of those types of spiders, and the very last 2 only ever happen once for any given spider hunter).
stinger mould harvester (these allow extreme levels of healing).
orb spider handler (can get web to make web grenades, and blade venom).
rumor monger (not sure how you'd handle this one).
scavenger (actually scavenges corpses and such. can find bionics).
explorer (not sure how you'd implement)
giant rat herder (could give you attack animal options?).
carrion bat handler (gives you bats that you can send messages with and which also fight. the bats also have the plague, so...). can cause your bat handler to become immune to the plague as well, which is nice.
none of these are, to my knowledge, canon for the setting. but it was definitely one of the articles i found really interesting (although frankly, i think it was also quite a ridiculously *powerful* set of skills for gangers to choose from compared to almost anything... getting a bunch of scaly spear guns or 3 extra bats to take bullets for you and such can all really add up fast).