You should be safe, but death isn't completely unavoidable. Look for a good bot that can flee after attacked. If you have less than 60-70 defense, look into getting a bot that has a deathwalk as well.
I've never used it, but shadowscripting.org has a free LRC fisher. They're the people who made iDungeon pro, which is undeniably the most complex bot of all time.
Less people fish Cavefish so statistically you're more likely to be singled out by the monsters there. I tried cavefish for 85-90 but found that it was really bad xp and cash so I just powerfished salmon till 90 and then went on to rocktails.