I noticed fishing zombies spawning very frequently, and considering these zombies are empowered with speed, strength, and resistance, they were a major problem for early game players. I didn't want to completely disable them, so I went into config/Mariculture/general-stuff.cfg and set "Zombie > Spawn with Fishing Gear Chance > 0-1" to 0.005. Despite this, fishing gear zombies still seemed to spawn too frequently. So, I got to browsing the source code and I noticed the following line:

if (event.world.rand.nextFloat() - 0.1F < GeneralStuff.FISHING_GEAR_CHANCE)

Assuming that nextFloat() returns a number in the range [0,1], subtracting 0.1F here is effectively adding a 10% chance on top of what the user has configured. Removing the - 0.1F here should fix the problem.

Edit:
I didn't notice this version was no longer supported until after I posted. Feel free to tag the issue as such.