as i said i did not encounter with dorado or se bass yet. Hovewer i shoot some nice saros at different conditions with different techniques.
I already explained what i know about sargo aspetto at shallow, so in deep it should be even easier to shoot considering the conditions, of course if you have enough apnea skill.
I also shoot some of them while they are sitting motionless on the bottom inside ofthe sea weed (very very hard to detect). They camofulaged with stripes just like dentex and hide in sea weed, especially the small independent sea weed groups near the small rock formations. In that case they are comparatively easier to shoot but you should have good marksman skill and judge the distance right. You again start with smooth and silence duckdive (don't use your legs in that one at the begining of the dive, just lower your upeer body 90 degree towards the bottom, raise one leg up slowly without splashing to much water around. After raising your one leg up, you will start to sink slowly, when you feel that your second leg in completely in the water you can start very small kicks) its very important to use small to no kick while approaching the fish on the bottom. Preferabbly dive to the fish directly from the top (if its motionless sargo, it does not work for groupers) or from behing, after very few small kick you will reach the neutral bouyancy they you can take couple extra small kick to to fasten your decent a little bit. But after that you should stop kicking and glide to the direction to the fish from the back or top as i said before. You can use fins to adjust your direction of glide. You should keep your gun extended, just like the OMER's figure. If you do all the thing correctly and if the fish is stays too you will get into the shooting range (don't rush here by misjuding the distance and make blank shoot, i did this too much last year.) When you are in shooting range and the fish start to move little bit that means she noticed you and she will espace in the first opportunity so you have to make quick shoot in that situation, if she still not noticed you consider her on the string rofl . Well if you are confident about your gun and marksman skill you can take a shoot from behind or from the top both are very challenging and hard to hit, otherwise when you enter the range and if the fish still not aware of you you can make swift fin movent and turn around the fish so you can position your self for the boradside shoot but after you position yourself for the broadside the fish MAY sense you and escape, so take your shoot at the first opportunity. Actually its easier that it sounds in real life one you get used to it.
edit: in any case don't wait until level down to the bottom in that case it will run away even if its the most stupid fish of the day, so you will have to make
angle shoot from level above. Just aim good and hope the best.
Sargos in the cave, i noticed that sargos at shallow water likes to hand around the caves early morning and at the sunset. In that period they like to go in and out of their caves, you can surprisingly see sargos that you never see before there. If they are going in and out of the cave at the shallow, genereally they are very very hard to shoot in the cave because their houses will be well protected. But they have habbit to turn back and look whats going on outside the cave. As soon as they enter the cave, do quick duck dive and position yourself to see the enterance of the hole, so you can shoot them while they come out. But you have to be very quick to positon yourself on the bottom because you will have not much time. They like to turn back just few seconds later than they enter the cave. And don't lay in front of the cave, if they see you they will not come out. Hovewer no matter what they don't come out or you lost the opportunity to shoot, just dive down light your torch and ready to pull trigger at the first sight. But as i said, sargos in the shallow who stays in the caves are very hard to shoot at least it is here since their caves are connected with others you will probably not even see the fish.
At depth they are more stupid, so you can shoot them with any decent tecnique.
May be some more experainced sargo hunter would like to contribute to this post since i am not the most experianced hunter here, those are the things that i just observed....The fish habbitat may change from location to location aside from country to country...