Well Bgill you surprised me with that: perfect translation and very good tips! (rep points given!). Moreover, Oflow has the videos, and now he has a translation too, so there wouldn't be much more to say.
All I can do now is adding some more tips and suggestions to go further into the subject.
Torbido means murky. For obvious reasons you will hunt in Torbido with very short guns (a 75 euro might be too long!!!), such as a 60 bandgun or a 50/70 pneumatic, better with a five pronger. Why a 5 pronger? In murky water fish will become visibile suddenly and won't give you any time for aiming: a 5 pronger has a wider impact surface, so you're more likely to hit the target and to hold it.
Use a reel anyway: it will help you to hold the fish, and to locate both the gun and the hit fish.
Be very silent, quiet, stealthy: in complete absence of visibility the fish will focus on vibrations. Don't make any.
Bgill gave a very good tip for low viz: aiming from bottom to surface. You choose a promising spot, lay down on the bottom and look up to the surface brightened by the sky above, so that a counterlight effect will help you recognize the dark shape of fishes passing in between.
But the subsequent question is: where to go? With this technique you're hunting shadows, but you must know where there's more probability that some "shadows" will be passing by. And this is THE question about spearfishing in general.
More specifically related to very, very, very low viz. When the viz is short, it's short both for you and for the fish. The fish as well need some familiar point of reference, and they tend to move along a pattern given by recognizable things or objects: they will be likely to pass by rocks bigger than the average, isolated kelp bushes, pieces of pipeline, boat docks, wrecks or any sort of familiar submerged structure. These are the best places to perform the counterlight hunting suggested by Bgill.
But this does not say it all, of course.
From what I have experienced, a fish must always have a good reason to choose a place to stay or to go to instead of another: that's related to period of the year, food chain events, weather/current events, reproduction events, type of bottom chosen by each species as a favourite habitat, and also the perception of "safety" that a fish may have in a place or another.
Just ask yourself some questions: is there any species which is spawning, making eggs or breeding newborns in this period of the year? What's the depth and type of bottom chosen by that species for reproduction? That's where you have to go! It's a bit unfair and slightly cruel to shoot a fish in love or breeding, but many other antagonist species will go there looking for eggs and newborn to eat: reproduction of "enemy" species stirs up the food chain as well as current, weather and tide.
About where to go: when the water is very murky in the first shallow meters, you might find clear water areas if you go deeper, along or under the thermocline (the "cut" of cold water). However this doesn't help much, because most of reef fish do not like to stay under the thermocline.
But if you hunt in a closed bay, there might be areas of clearer water also in shallow, related to tide or current of water with different temperature pouring in from open sea. You might try to look for these clear areas: if you find them, they'll probably be full of fish.
Current is an important feature: if the current comes from your back, it will be easier for big predators to swim towards you (they hunt against current). On the other end, currents from your back will forward all noises and vibrations you make, alerting the fish.
So remember: be quiet!
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Posts on agguato and aspetto to follow....>>>>
