Re. wrasse, they also eat small mussels (stomach content check), not sure how they break them up though (teeth in the throat?). I also recall reading of them taking lures (Mike Ladle website, for example) -- I also read somewhere that one winter was particularly hard for them, after which they were taking anything and everything.
Re. solo spearing. I also spear solo - very difficult to find folk willing to go out regularly, esp. early in the season, so far from the sea. It also makes diving on family trips feasible. However, I actually prefer it & I stay pretty shallow (after all, most of the big fish I have seen have been less than 6 feet deep) and usually pretty close to the shore. Less splash & fuss too -- also no chance of shooting the other guy; I'd feel pretty bad if I shot somebody but I'd feel even worse if they shot me! (Ian Rogers has an interesting story in his book about the flash of his mask being mistaken for a fish). See the spearfishing injuries thread for other stories of woe (short guns seem to be involved in several of the injuries). Diving alone is not ideal but perhaps not as black & white an issue as it is sometimes presented with regard to safety.
[Caveat lector: You need to weigh up the risks & benefits for your own circumstances, background, fitness, health, behaviour, etc. Best to err on the side of caution.]
The Wrasse charge at the rocks with mussels on them and the impact of their teeth/mouth on the mussel makes it explode and they eat everything then crap out the shell -- quite an amazing sight the first time you see it. I'm not sure which was more shocking, when I saw them charging at the rocks, watching the mussels explode upon impact or the noise it made.
As for diving solo, we've been there before but personally been doing it for the best part of 12yrs now and will continue to do so since a) it's never very deep b) any buddy is useless unless you have the vis to have one on the surface while the other is down and your buddy can see you and never takes his/her eyes off you. c) I hate it when someone else scares away the fish
Guess I'll throw in the france report while I'm at it sure:
Had my first outing of the season last week (last week of legal scallop fishing here) and we went out to Pleneuf/Val Andre (left of cap d'erquy). Vis was fantastic, we both had our main course in scallops within 30mins at low tide then went onwards looking for the fish but instead we stumbled across 4 lobster holes by complete fluke! 2 of them also held respectably sized congers. Only one of the lobbies wanted to play but he just wouldn't come out of his hole
Dived the low and rising tide, spotted a nice shoal of a dozen odd bass circa the 3-3.5lb mark but my gun was unloaded as I was concentrating on swimming and getting back to shore at this stage. Back off tomorrow to try again for the fish. We took home a nice feed of scallops, the 2 congers and one or two spider crabs -- which seem to have arrived a little early, alongside the bass. I've never seen bass here so early in the season.